Thread: [Cppcms-users] Compile error: traits is not a template

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cppcms-users

[Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-08-31 15:37:14

I have a correct class with no compilation error. All codes in response.h:
#ifndef __RESPONSE_H
#define __RESPONSE_H

namespace kaimei{
  class response {
  public:
    enum
{OK=0,SAVE_EMAIL_ERROR=1,CHANGE_PWD_ERROR=2,LOGIN_ERROR=3,CREATE_ACCOUNT_ERROR=4,
 SAVE_MESSAGE_ERROR=5,CHANGE_LANGUAGE_ERROR=6,NONE_CONTENT=7,LOAD_DISPLAY_ERROR=8,

 NONE_USER_ID=9,GET_MESSAGE_LOG_ERROR=10,QUIT_ERROR=11,NONE_ADMIN=12,BIND_ERROR=13,
 UPDATE_DESCRIPTION_ERROR=14,UNBIND_ERROR=15,LOAD_GROUPS_ERROR=16,UPDATE_GROUP_NAME_ERROR=17
    };
    int status;
    string message;
    string value;
  };
}

namespace cppcms {
  namespace json {

    template<>
      struct traits<kaimei::response> {

      static void set(value &v, kaimei::response const& in) {
v.set("status", in.status);
 v.set("message", in.message);
v.set("value", in.value);
      }
    };

  }
}

#endif


But I got error when compiling another class. It has group.h and group.cpp
file.

#ifndef __GROUP_H
#define __GROUP_H

#include <string>

namespace kaimei{
  class group {
  public:
    group();

    std::string id;
    std::string description;
    std::string name;
    int device_number;

    std::string json_string() const;
  };
}

namespace cppcms {
  namespace json {

    template<>
      struct traits<kaimei::group> {

      static void set(value &v, kaimei::group const& in) {
 v.set("id", in.id);
v.set("description", in.description);
 v.set("name", in.name);
v.set("deviceNumber", in.device_number);
      }
    };

  }
}


#endif

Error output:

[  3%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
In file included from /home/chenshu/work/kaimei/cppweb/include/groups.h:6:0,
                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
/home/chenshu/work/kaimei/cppweb/include/group.h:24:14: error: ‘traits’ is
not a template
/home/chenshu/work/kaimei/cppweb/include/group.h:24:36: error: explicit
specialization of non-template ‘cppcms::json::traits’
/home/chenshu/work/kaimei/cppweb/include/group.h:26:23: error: ‘value’ has
not been declared
/home/chenshu/work/kaimei/cppweb/include/group.h: In static member function
‘static void cppcms::json::traits::set(int&, const kaimei::group&)’:
/home/chenshu/work/kaimei/cppweb/include/group.h:27:4: error: request for
member ‘set’ in ‘v’, which is of non-class type ‘int’
/home/chenshu/work/kaimei/cppweb/include/group.h:28:4: error: request for
member ‘set’ in ‘v’, which is of non-class type ‘int’
/home/chenshu/work/kaimei/cppweb/include/group.h:29:4: error: request for
member ‘set’ in ‘v’, which is of non-class type ‘int’
/home/chenshu/work/kaimei/cppweb/include/group.h:30:4: error: request for
member ‘set’ in ‘v’, which is of non-class type ‘int’


I am not good at template programming. Why did this happen?


陈抒
Best regards
http://blog.csdn.net/sheismylife

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-08-31 15:59:11

Forgot another class: groups . It contains several group objects in vector.
Here is groups.h content:

#ifndef __GROUPS_H
#define __GROUPS_H

#include <vector>
#include <boost/shared_ptr.hpp>
#include "group.h"

class groups{
 public:
    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
    typedef std::vector<boost::shared_ptr<group> >::const_iterator
const_iterator;

    void add(boost::shared_ptr<group> g);

    bool empty() const;

    unsigned int size() const;

    std::string json_string() const;

    friend cppcms::json::traits<kaimei::group>;

 private:
    std::vector<boost::shared_ptr<group> > values_;
};

namespace cppcms {
  namespace json {

    template<>
      struct traits<kaimei::groups> {

      static void set(value &v, kaimei::groups const& in) {
v.set("size", groups.size());
v.set("values", in.values_);
      }
    };

  }
}

#endif



陈抒
Best regards
http://blog.csdn.net/sheismylife


On Fri, Aug 31, 2012 at 11:36 PM, 陈抒 <csf...@gm...> wrote:

> I have a correct class with no compilation error. All codes in response.h:
> #ifndef __RESPONSE_H
> #define __RESPONSE_H
>
> namespace kaimei{
>   class response {
>   public:
>     enum
> {OK=0,SAVE_EMAIL_ERROR=1,CHANGE_PWD_ERROR=2,LOGIN_ERROR=3,CREATE_ACCOUNT_ERROR=4,
>  SAVE_MESSAGE_ERROR=5,CHANGE_LANGUAGE_ERROR=6,NONE_CONTENT=7,LOAD_DISPLAY_ERROR=8,
>
>  NONE_USER_ID=9,GET_MESSAGE_LOG_ERROR=10,QUIT_ERROR=11,NONE_ADMIN=12,BIND_ERROR=13,
>  UPDATE_DESCRIPTION_ERROR=14,UNBIND_ERROR=15,LOAD_GROUPS_ERROR=16,UPDATE_GROUP_NAME_ERROR=17
>     };
>     int status;
>     string message;
>     string value;
>   };
> }
>
> namespace cppcms {
>   namespace json {
>
>     template<>
>       struct traits<kaimei::response> {
>
>       static void set(value &v, kaimei::response const& in) {
> v.set("status", in.status);
>  v.set("message", in.message);
> v.set("value", in.value);
>       }
>     };
>
>   }
> }
>
> #endif
>
>
> But I got error when compiling another class. It has group.h and group.cpp
> file.
>
> #ifndef __GROUP_H
> #define __GROUP_H
>
> #include <string>
>
> namespace kaimei{
>   class group {
>   public:
>     group();
>
>     std::string id;
>     std::string description;
>     std::string name;
>     int device_number;
>
>     std::string json_string() const;
>   };
> }
>
> namespace cppcms {
>   namespace json {
>
>     template<>
>       struct traits<kaimei::group> {
>
>       static void set(value &v, kaimei::group const& in) {
>  v.set("id", in.id);
> v.set("description", in.description);
>  v.set("name", in.name);
> v.set("deviceNumber", in.device_number);
>       }
>     };
>
>   }
> }
>
>
> #endif
>
> Error output:
>
> [  3%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
> In file included from
> /home/chenshu/work/kaimei/cppweb/include/groups.h:6:0,
>                  from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
> /home/chenshu/work/kaimei/cppweb/include/group.h:24:14: error: ‘traits’ is
> not a template
> /home/chenshu/work/kaimei/cppweb/include/group.h:24:36: error: explicit
> specialization of non-template ‘cppcms::json::traits’
> /home/chenshu/work/kaimei/cppweb/include/group.h:26:23: error: ‘value’ has
> not been declared
> /home/chenshu/work/kaimei/cppweb/include/group.h: In static member
> function ‘static void cppcms::json::traits::set(int&, const
> kaimei::group&)’:
> /home/chenshu/work/kaimei/cppweb/include/group.h:27:4: error: request for
> member ‘set’ in ‘v’, which is of non-class type ‘int’
> /home/chenshu/work/kaimei/cppweb/include/group.h:28:4: error: request for
> member ‘set’ in ‘v’, which is of non-class type ‘int’
> /home/chenshu/work/kaimei/cppweb/include/group.h:29:4: error: request for
> member ‘set’ in ‘v’, which is of non-class type ‘int’
> /home/chenshu/work/kaimei/cppweb/include/group.h:30:4: error: request for
> member ‘set’ in ‘v’, which is of non-class type ‘int’
>
>
> I am not good at template programming. Why did this happen?
>
>
> 陈抒
> Best regards
> http://blog.csdn.net/sheismylife
>

Re: [Cppcms-users] Compile error: traits is not a template

From: Artyom B. <art...@ya...> - 2012-09-01 06:34:34

>

>But I got error when compiling another class. It has group.h and group.cpp file.
>
>
>#ifndef __GROUP_H
>#define __GROUP_H
>
>
>#include <string>
>
>
>namespace kaimei{
>...
}
>
>
>namespace cppcms {
>  namespace json {
>    template<>
>      struct traits<kaimei::group> {
>...
>      }
>  }
>}
>
>
>
> [snip]
>
>I am not good at template programming. Why did this happen?
>

You can't specialize undefined struct - you need to include <cppcms/json.h>
header. It provides the original traits struct and than you specialize it for
your type of class 


>
>陈抒 
>Best regards
>http://blog.csdn.net/sheismylife
>

Regards,
Artyom

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-09-01 07:06:05

Thank you. But I see new error.
groups.h file:

#ifndef __GROUPS_H
#define __GROUPS_H

#include <vector>
#include <boost/shared_ptr.hpp>
#include "group.h"

namespace kaimei{

  class groups{
  public:
    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
    typedef std::vector<boost::shared_ptr<group> >::const_iterator
const_iterator;

    void add(boost::shared_ptr<group> g);

    bool empty() const;

    unsigned int size() const;

    std::string json_string() const;

    friend class cppcms::json::traits<kaimei::groups>;

  private:
    std::vector<boost::shared_ptr<kaimei::group> > values_;
  };

}

namespace cppcms {
  namespace json {

    template<>
      struct traits<kaimei::groups> {

      static void set(value &v, kaimei::groups const& in) {
v.set("size", in.size());
 v.set("values", in.values_);
      }
    };

  }
}

#endif


error message:
  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp,
../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp,
../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp,
../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp,
../../src/view/login.cpp, ../../src/view/group_management.cpp
[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
In file included from /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
/usr/include/cppcms/json.h: In member function ‘void
cppcms::json::value::set_value(const T&) [with T =
boost::shared_ptr<kaimei::group>]’:
/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void
cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const
std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
/usr/include/cppcms/json.h:247:4:   instantiated from ‘void
cppcms::json::value::set_value(const T&) [with T =
std::vector<boost::shared_ptr<kaimei::group> >]’
/usr/include/cppcms/json.h:316:4:   instantiated from
‘cppcms::json::value::value(const T&) [with T =
std::vector<boost::shared_ptr<kaimei::group> >]’
/usr/include/cppcms/json.h:352:4:   instantiated from ‘void
cppcms::json::value::set(const char*, const T&) [with T =
std::vector<boost::shared_ptr<kaimei::group> >]’
/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated
from here
/usr/include/cppcms/json.h:247:4: error: incomplete type
‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested
name specifier
make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
make: *** [all] Error 2


陈抒
Best regards
http://blog.csdn.net/sheismylife


On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...> wrote:

> >
>
> >But I got error when compiling another class. It has group.h and
> group.cpp file.
> >
> >
> >#ifndef __GROUP_H
> >#define __GROUP_H
> >
> >
> >#include <string>
> >
> >
> >namespace kaimei{
> >...
> }
> >
> >
> >namespace cppcms {
> >  namespace json {
> >    template<>
> >      struct traits<kaimei::group> {
> >...
> >      }
> >  }
> >}
> >
> >
> >
> > [snip]
> >
> >I am not good at template programming. Why did this happen?
> >
>
> You can't specialize undefined struct - you need to include <cppcms/json.h>
> header. It provides the original traits struct and than you specialize it
> for
> your type of class
>
>
> >
> >陈抒
> >Best regards
> >http://blog.csdn.net/sheismylife
> >
>
> Regards,
> Artyom
>
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-09-01 07:07:19

json.h was added into group.h
groups.h include group.h

陈抒
Best regards
http://blog.csdn.net/sheismylife


On Sat, Sep 1, 2012 at 3:05 PM, 陈抒 <csf...@gm...> wrote:

> Thank you. But I see new error.
> groups.h file:
>
> #ifndef __GROUPS_H
> #define __GROUPS_H
>
> #include <vector>
> #include <boost/shared_ptr.hpp>
> #include "group.h"
>
> namespace kaimei{
>
>   class groups{
>   public:
>     typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
>     typedef std::vector<boost::shared_ptr<group> >::const_iterator
> const_iterator;
>
>     void add(boost::shared_ptr<group> g);
>
>     bool empty() const;
>
>     unsigned int size() const;
>
>     std::string json_string() const;
>
>     friend class cppcms::json::traits<kaimei::groups>;
>
>    private:
>     std::vector<boost::shared_ptr<kaimei::group> > values_;
>   };
>
> }
>
> namespace cppcms {
>   namespace json {
>
>     template<>
>       struct traits<kaimei::groups> {
>
>       static void set(value &v, kaimei::groups const& in) {
> v.set("size", in.size());
>  v.set("values", in.values_);
>       }
>     };
>
>   }
> }
>
> #endif
>
>
> error message:
>   3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp,
> ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp,
> ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp,
> ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp,
> ../../src/view/login.cpp, ../../src/view/group_management.cpp
>  [  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
> In file included from /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
>                  from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
>                  from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
> /usr/include/cppcms/json.h: In member function ‘void
> cppcms::json::value::set_value(const T&) [with T =
> boost::shared_ptr<kaimei::group>]’:
> /usr/include/cppcms/json.h:604:5:   instantiated from ‘static void
> cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const
> std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
> /usr/include/cppcms/json.h:247:4:   instantiated from ‘void
> cppcms::json::value::set_value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> /usr/include/cppcms/json.h:316:4:   instantiated from
> ‘cppcms::json::value::value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> /usr/include/cppcms/json.h:352:4:   instantiated from ‘void
> cppcms::json::value::set(const char*, const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> /home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated
> from here
> /usr/include/cppcms/json.h:247:4: error: incomplete type
> ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested
> name specifier
> make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
> make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
> make: *** [all] Error 2
>
>
> 陈抒
> Best regards
> http://blog.csdn.net/sheismylife
>
>
> On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...> wrote:
>
>> >
>>
>> >But I got error when compiling another class. It has group.h and
>> group.cpp file.
>> >
>> >
>> >#ifndef __GROUP_H
>> >#define __GROUP_H
>> >
>> >
>> >#include <string>
>> >
>> >
>> >namespace kaimei{
>> >...
>> }
>> >
>> >
>> >namespace cppcms {
>> >  namespace json {
>> >    template<>
>> >      struct traits<kaimei::group> {
>> >...
>> >      }
>> >  }
>> >}
>> >
>> >
>> >
>> > [snip]
>> >
>> >I am not good at template programming. Why did this happen?
>> >
>>
>> You can't specialize undefined struct - you need to include
>> <cppcms/json.h>
>> header. It provides the original traits struct and than you specialize it
>> for
>> your type of class
>>
>>
>> >
>> >陈抒
>> >Best regards
>> >http://blog.csdn.net/sheismylife
>> >
>>
>> Regards,
>> Artyom
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Cppcms-users mailing list
>> Cpp...@li...
>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>
>

Re: [Cppcms-users] Compile error: traits is not a template

From: Artyom B. <art...@ya...> - 2012-09-01 09:41:48

Because shared_ptr<group> is not specialized for traits...

You need manually create an array and sets its memebers.i.e

Something like that:

cppcms::json::array &a=v.at("values",cppcms::json::array());
a.resize(in.values_.size());
for(size_t i = 0;i<in.values_.size();i++)
  a[i]=*in.values_[i];





Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/



>________________________________
> From: 陈抒 <csf...@gm...>
>To: Artyom Beilis <art...@ya...>; cpp...@li... 
>Sent: Saturday, September 1, 2012 10:05 AM
>Subject: Re: [Cppcms-users] Compile error: traits is not a template
> 
>
>Thank you. But I see new error.
>groups.h file:
>
>
>#ifndef __GROUPS_H
>#define __GROUPS_H
>
>
>#include <vector>
>#include <boost/shared_ptr.hpp>
>#include "group.h"
>
>
>namespace kaimei{
>
>
>  class groups{
>  public:
>    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
>    typedef std::vector<boost::shared_ptr<group> >::const_iterator const_iterator;
>
>
>    void add(boost::shared_ptr<group> g);
>
>
>    bool empty() const;
>
>
>    unsigned int size() const;
>
>
>    std::string json_string() const;
>    
>    friend class cppcms::json::traits<kaimei::groups>;
>
>
>  private:
>    std::vector<boost::shared_ptr<kaimei::group> > values_;
>  };
>
>
>}
>
>
>namespace cppcms {
>  namespace json {
>
>
>    template<>
>      struct traits<kaimei::groups> {
>
>
>      static void set(value &v, kaimei::groups const& in) {
>v.set("size", in.size());
>v.set("values", in.values_);
>      }
>    };
>
>
>  }
>}
>
>
>#endif
>
>
>
>
>error message:
>  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp, ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp, ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp, ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp, ../../src/view/login.cpp, ../../src/view/group_management.cpp
>[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
>In file included from /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
>                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
>                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
>/usr/include/cppcms/json.h: In member function ‘void cppcms::json::value::set_value(const T&) [with T = boost::shared_ptr<kaimei::group>]’:
>/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
>/usr/include/cppcms/json.h:247:4:   instantiated from ‘void cppcms::json::value::set_value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>/usr/include/cppcms/json.h:316:4:   instantiated from ‘cppcms::json::value::value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>/usr/include/cppcms/json.h:352:4:   instantiated from ‘void cppcms::json::value::set(const char*, const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated from here
>/usr/include/cppcms/json.h:247:4: error: incomplete type ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested name specifier
>make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
>make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
>make: *** [all] Error 2
>
>
>陈抒 
>Best regards
>http://blog.csdn.net/sheismylife
>
>
>
>On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...> wrote:
>
>>
>>
>>>But I got error when compiling another class. It has group.h and group.cpp file.
>>>
>>>
>>>#ifndef __GROUP_H
>>>#define __GROUP_H
>>>
>>>
>>>#include <string>
>>>
>>>
>>>namespace kaimei{
>>>...
>>
>>}
>>>
>>>
>>>namespace cppcms {
>>>  namespace json {
>>>    template<>
>>>      struct traits<kaimei::group> {
>>>...
>>>      }
>>>  }
>>>}
>>>
>>>
>>>
>>> [snip]
>>
>>>
>>>I am not good at template programming. Why did this happen?
>>>
>>
>>You can't specialize undefined struct - you need to include <cppcms/json.h>
>>header. It provides the original traits struct and than you specialize it for
>>your type of class
>>
>>
>>
>>>
>>>陈抒
>>>Best regards
>>>http://blog.csdn.net/sheismylife
>>>
>>
>>Regards,
>>Artyom
>>
>>
>>------------------------------------------------------------------------------
>>Live Security Virtual Conference
>>Exclusive live event will cover all the ways today's security and
>>threat landscape has changed and how IT managers can respond. Discussions
>>will include endpoint security, mobile security and the latest in malware
>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>_______________________________________________
>>Cppcms-users mailing list
>>Cpp...@li...
>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>
>------------------------------------------------------------------------------
>Live Security Virtual Conference
>Exclusive live event will cover all the ways today's security and 
>threat landscape has changed and how IT managers can respond. Discussions 
>will include endpoint security, mobile security and the latest in malware 
>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>_______________________________________________
>Cppcms-users mailing list
>Cpp...@li...
>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
>

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-09-01 12:32:59

I changed your codes a bit.
namespace cppcms {
  namespace json {

    template<>
      struct traits<kaimei::groups> {

      static void set(value &v, kaimei::groups const& in) {
v.set("size", in.size());
cppcms::json::array a;
 a.resize(in.values_.size());
for(size_t i = 0; i < in.values_.size(); i++) {
  a[i]=*in.values_[i];
}
v.set("values", a);
      }
    };

  }
}

Two issues:
1. This way is not efficient, a lot of deep copy would occur when copying
vector from array.
My original way is very simple, create a stringstream object, groups object
converts all member variables into string, append them to stringstream. It
does not looks elegant, but faster.
2. It doesn't work. I got an exception:
cppcms::json::bad_cast:  error converting from object


陈抒
Best regards
http://blog.csdn.net/sheismylife


On Sat, Sep 1, 2012 at 5:41 PM, Artyom Beilis <art...@ya...> wrote:

> Because shared_ptr<group> is not specialized for traits...
>
> You need manually create an array and sets its memebers.i.e
>
> Something like that:
>
> cppcms::json::array &a=v.at("values",cppcms::json::array());
> a.resize(in.values_.size());
> for(size_t i = 0;i<in.values_.size();i++)
>   a[i]=*in.values_[i];
>
>
>
>
>
> Artyom Beilis
> --------------
> CppCMS - C++ Web Framework:   http://cppcms.com/
> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
>
> >________________________________
> > From: 陈抒 <csf...@gm...>
> >To: Artyom Beilis <art...@ya...>;
> cpp...@li...
> >Sent: Saturday, September 1, 2012 10:05 AM
> >Subject: Re: [Cppcms-users] Compile error: traits is not a template
> >
> >
> >Thank you. But I see new error.
> >groups.h file:
> >
> >
> >#ifndef __GROUPS_H
> >#define __GROUPS_H
> >
> >
> >#include <vector>
> >#include <boost/shared_ptr.hpp>
> >#include "group.h"
> >
> >
> >namespace kaimei{
> >
> >
> >  class groups{
> >  public:
> >    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
> >    typedef std::vector<boost::shared_ptr<group> >::const_iterator
> const_iterator;
> >
> >
> >    void add(boost::shared_ptr<group> g);
> >
> >
> >    bool empty() const;
> >
> >
> >    unsigned int size() const;
> >
> >
> >    std::string json_string() const;
> >
> >    friend class cppcms::json::traits<kaimei::groups>;
> >
> >
> >  private:
> >    std::vector<boost::shared_ptr<kaimei::group> > values_;
> >  };
> >
> >
> >}
> >
> >
> >namespace cppcms {
> >  namespace json {
> >
> >
> >    template<>
> >      struct traits<kaimei::groups> {
> >
> >
> >      static void set(value &v, kaimei::groups const& in) {
> >v.set("size", in.size());
> >v.set("values", in.values_);
> >      }
> >    };
> >
> >
> >  }
> >}
> >
> >
> >#endif
> >
> >
> >
> >
> >error message:
> >  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp,
> ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp,
> ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp,
> ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp,
> ../../src/view/login.cpp, ../../src/view/group_management.cpp
> >[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
> >In file included from
> /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
> >                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
> >                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
> >/usr/include/cppcms/json.h: In member function ‘void
> cppcms::json::value::set_value(const T&) [with T =
> boost::shared_ptr<kaimei::group>]’:
> >/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void
> cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const
> std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
> >/usr/include/cppcms/json.h:247:4:   instantiated from ‘void
> cppcms::json::value::set_value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/usr/include/cppcms/json.h:316:4:   instantiated from
> ‘cppcms::json::value::value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/usr/include/cppcms/json.h:352:4:   instantiated from ‘void
> cppcms::json::value::set(const char*, const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated
> from here
> >/usr/include/cppcms/json.h:247:4: error: incomplete type
> ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested
> name specifier
> >make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
> >make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
> >make: *** [all] Error 2
> >
> >
> >陈抒
> >Best regards
> >http://blog.csdn.net/sheismylife
> >
> >
> >
> >On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...>
> wrote:
> >
> >>
> >>
> >>>But I got error when compiling another class. It has group.h and
> group.cpp file.
> >>>
> >>>
> >>>#ifndef __GROUP_H
> >>>#define __GROUP_H
> >>>
> >>>
> >>>#include <string>
> >>>
> >>>
> >>>namespace kaimei{
> >>>...
> >>
> >>}
> >>>
> >>>
> >>>namespace cppcms {
> >>>  namespace json {
> >>>    template<>
> >>>      struct traits<kaimei::group> {
> >>>...
> >>>      }
> >>>  }
> >>>}
> >>>
> >>>
> >>>
> >>> [snip]
> >>
> >>>
> >>>I am not good at template programming. Why did this happen?
> >>>
> >>
> >>You can't specialize undefined struct - you need to include
> <cppcms/json.h>
> >>header. It provides the original traits struct and than you specialize
> it for
> >>your type of class
> >>
> >>
> >>
> >>>
> >>>陈抒
> >>>Best regards
> >>>http://blog.csdn.net/sheismylife
> >>>
> >>
> >>Regards,
> >>Artyom
> >>
> >>
>
> >>------------------------------------------------------------------------------
> >>Live Security Virtual Conference
> >>Exclusive live event will cover all the ways today's security and
> >>threat landscape has changed and how IT managers can respond. Discussions
> >>will include endpoint security, mobile security and the latest in malware
> >>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> >>_______________________________________________
> >>Cppcms-users mailing list
> >>Cpp...@li...
> >>https://lists.sourceforge.net/lists/listinfo/cppcms-users
> >>
> >
>
> >------------------------------------------------------------------------------
> >Live Security Virtual Conference
> >Exclusive live event will cover all the ways today's security and
> >threat landscape has changed and how IT managers can respond. Discussions
> >will include endpoint security, mobile security and the latest in malware
> >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> >_______________________________________________
> >Cppcms-users mailing list
> >Cpp...@li...
> >https://lists.sourceforge.net/lists/listinfo/cppcms-users
> >
> >
> >
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>

Re: [Cppcms-users] Compile error: traits is not a template

From: Artyom B. <art...@ya...> - 2012-09-01 13:15:33

You hadn't read my code correctly

cppcms::json::array &a=v.at("values",cppcms::json::array());

a is a reference and you fill it.

Anyway read the cppcms::json::value reference documentation for further details

 
Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/



>________________________________
> From: 陈抒 <csf...@gm...>
>To: Artyom Beilis <art...@ya...>; cpp...@li... 
>Sent: Saturday, September 1, 2012 3:32 PM
>Subject: Re: [Cppcms-users] Compile error: traits is not a template
> 
>
>I changed your codes a bit. 
>namespace cppcms {
>  namespace json {
>
>
>    template<>
>      struct traits<kaimei::groups> {
>
>
>      static void set(value &v, kaimei::groups const& in) {
>v.set("size", in.size());
>cppcms::json::array a;
>a.resize(in.values_.size());
>for(size_t i = 0; i < in.values_.size(); i++) {
>  a[i]=*in.values_[i];
>}
>v.set("values", a);
>      }
>    };
>
>
>  }
>}
>
>
>Two issues:
>1. This way is not efficient, a lot of deep copy would occur when copying vector from array.
>My original way is very simple, create a stringstream object, groups object converts all member variables into string, append them to stringstream. It does not looks elegant, but faster. 
>2. It doesn't work. I got an exception:
>cppcms::json::bad_cast:  error converting from object
>
>
>陈抒 
>Best regards
>http://blog.csdn.net/sheismylife
>
>
>
>On Sat, Sep 1, 2012 at 5:41 PM, Artyom Beilis <art...@ya...> wrote:
>
>Because shared_ptr<group> is not specialized for traits...
>>
>>You need manually create an array and sets its memebers.i.e
>>
>>Something like that:
>>
>>cppcms::json::array &a=v.at("values",cppcms::json::array());
>>a.resize(in.values_.size());
>>for(size_t i = 0;i<in.values_.size();i++)
>>  a[i]=*in.values_[i];
>>
>>
>>
>>
>>
>>Artyom Beilis
>>--------------
>>CppCMS - C++ Web Framework:   http://cppcms.com/
>>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>
>>
>>
>>>________________________________
>>> From: 陈抒 <csf...@gm...>
>>>To: Artyom Beilis <art...@ya...>; cpp...@li...
>>>Sent: Saturday, September 1, 2012 10:05 AM
>>>Subject: Re: [Cppcms-users] Compile error: traits is not a template
>>
>>>
>>>
>>>Thank you. But I see new error.
>>>groups.h file:
>>>
>>>
>>>#ifndef __GROUPS_H
>>>#define __GROUPS_H
>>>
>>>
>>>#include <vector>
>>>#include <boost/shared_ptr.hpp>
>>>#include "group.h"
>>>
>>>
>>>namespace kaimei{
>>>
>>>
>>>  class groups{
>>>  public:
>>>    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
>>>    typedef std::vector<boost::shared_ptr<group> >::const_iterator const_iterator;
>>>
>>>
>>>    void add(boost::shared_ptr<group> g);
>>>
>>>
>>>    bool empty() const;
>>>
>>>
>>>    unsigned int size() const;
>>>
>>>
>>>    std::string json_string() const;
>>>    
>>>    friend class cppcms::json::traits<kaimei::groups>;
>>>
>>>
>>>  private:
>>>    std::vector<boost::shared_ptr<kaimei::group> > values_;
>>>  };
>>>
>>>
>>>}
>>>
>>>
>>>namespace cppcms {
>>>  namespace json {
>>>
>>>
>>>    template<>
>>>      struct traits<kaimei::groups> {
>>>
>>>
>>>      static void set(value &v, kaimei::groups const& in) {
>>>v.set("size", in.size());
>>>v.set("values", in.values_);
>>>      }
>>>    };
>>>
>>>
>>>  }
>>>}
>>>
>>>
>>>#endif
>>>
>>>
>>>
>>>
>>>error message:
>>>  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp, ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp, ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp, ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp, ../../src/view/login.cpp, ../../src/view/group_management.cpp
>>>[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
>>>In file included from /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
>>>                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
>>>                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
>>>/usr/include/cppcms/json.h: In member function ‘void cppcms::json::value::set_value(const T&) [with T = boost::shared_ptr<kaimei::group>]’:
>>>/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
>>>/usr/include/cppcms/json.h:247:4:   instantiated from ‘void cppcms::json::value::set_value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>/usr/include/cppcms/json.h:316:4:   instantiated from ‘cppcms::json::value::value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>/usr/include/cppcms/json.h:352:4:   instantiated from ‘void cppcms::json::value::set(const char*, const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated from here
>>>/usr/include/cppcms/json.h:247:4: error: incomplete type ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested name specifier
>>>make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
>>>make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
>>>make: *** [all] Error 2
>>>
>>>
>>>陈抒
>>>Best regards
>>>http://blog.csdn.net/sheismylife
>>>
>>>
>>>
>>>On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...> wrote:
>>>
>>>>
>>>>
>>>>>But I got error when compiling another class. It has group.h and group.cpp file.
>>>>>
>>>>>
>>>>>#ifndef __GROUP_H
>>>>>#define __GROUP_H
>>>>>
>>>>>
>>>>>#include <string>
>>>>>
>>>>>
>>>>>namespace kaimei{
>>>>>...
>>>>
>>>>}
>>>>>
>>>>>
>>>>>namespace cppcms {
>>>>>  namespace json {
>>>>>    template<>
>>>>>      struct traits<kaimei::group> {
>>>>>...
>>>>>      }
>>>>>  }
>>>>>}
>>>>>
>>>>>
>>>>>
>>>>> [snip]
>>>>
>>>>>
>>>>>I am not good at template programming. Why did this happen?
>>>>>
>>>>
>>>>You can't specialize undefined struct - you need to include <cppcms/json.h>
>>>>header. It provides the original traits struct and than you specialize it for
>>>>your type of class
>>>>
>>>>
>>>>
>>>>>
>>>>>陈抒
>>>>>Best regards
>>>>>http://blog.csdn.net/sheismylife
>>>>>
>>>>
>>>>Regards,
>>>>Artyom
>>>>
>>>>
>>>>------------------------------------------------------------------------------
>>>>Live Security Virtual Conference
>>>>Exclusive live event will cover all the ways today's security and
>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>will include endpoint security, mobile security and the latest in malware
>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>_______________________________________________
>>>>Cppcms-users mailing list
>>>>Cpp...@li...
>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>
>>>
>>>------------------------------------------------------------------------------
>>>Live Security Virtual Conference
>>>Exclusive live event will cover all the ways today's security and
>>>threat landscape has changed and how IT managers can respond. Discussions
>>>will include endpoint security, mobile security and the latest in malware
>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>_______________________________________________
>>>Cppcms-users mailing list
>>>Cpp...@li...
>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>
>>>
>>> 
>>
>>------------------------------------------------------------------------------
>>Live Security Virtual Conference
>>Exclusive live event will cover all the ways today's security and
>>threat landscape has changed and how IT managers can respond. Discussions
>>will include endpoint security, mobile security and the latest in malware
>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>_______________________________________________
>>Cppcms-users mailing list
>>Cpp...@li...
>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>
>------------------------------------------------------------------------------
>Live Security Virtual Conference
>Exclusive live event will cover all the ways today's security and 
>threat landscape has changed and how IT managers can respond. Discussions 
>will include endpoint security, mobile security and the latest in malware 
>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>_______________________________________________
>Cppcms-users mailing list
>Cpp...@li...
>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
>

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-09-01 13:24:45

I tried you codes the first time. It can't be compiled.

$ make
Scanning dependencies of target cppweb
[  3%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
In file included from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:0:
/home/chenshu/work/kaimei/cppweb/include/groups.h: In static member
function ‘static void
cppcms::json::traits<kaimei::groups>::set(cppcms::json::value&, const
kaimei::groups&)’:
/home/chenshu/work/kaimei/cppweb/include/groups.h:39:60: error: invalid
initialization of non-const reference of type ‘cppcms::json::array& {aka
std::vector<cppcms::json::value>&}’ from an rvalue of type ‘void’
make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
make: *** [all] Error 2

line 39 is :
cppcms::json::array &a=v.at("values",cppcms::json::array());

I upgraded CppCMS to latest version, also read your API document.
It seems your 'at' member function return 'void'

陈抒
Best regards
http://blog.csdn.net/sheismylife


On Sat, Sep 1, 2012 at 9:15 PM, Artyom Beilis <art...@ya...> wrote:

> You hadn't read my code correctly
>
> cppcms::json::array &a=v.at("values",cppcms::json::array());
>
> a is a reference and you fill it.
>
> Anyway read the cppcms::json::value reference documentation for further
> details
>
> Artyom Beilis
> --------------
> CppCMS - C++ Web Framework:   http://cppcms.com/
> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>   ------------------------------
> *From:* 陈抒 <csf...@gm...>
> *To:* Artyom Beilis <art...@ya...>;
> cpp...@li...
> *Sent:* Saturday, September 1, 2012 3:32 PM
>
> *Subject:* Re: [Cppcms-users] Compile error: traits is not a template
>
> I changed your codes a bit.
> namespace cppcms {
>   namespace json {
>
>     template<>
>       struct traits<kaimei::groups> {
>
>        static void set(value &v, kaimei::groups const& in) {
> v.set("size", in.size());
> cppcms::json::array a;
>  a.resize(in.values_.size());
> for(size_t i = 0; i < in.values_.size(); i++) {
>   a[i]=*in.values_[i];
> }
> v.set("values", a);
>       }
>     };
>
>   }
> }
>
> Two issues:
> 1. This way is not efficient, a lot of deep copy would occur when copying
> vector from array.
> My original way is very simple, create a stringstream object, groups
> object converts all member variables into string, append them to
> stringstream. It does not looks elegant, but faster.
> 2. It doesn't work. I got an exception:
> cppcms::json::bad_cast:  error converting from object
>
>
> 陈抒
> Best regards
> http://blog.csdn.net/sheismylife
>
>
> On Sat, Sep 1, 2012 at 5:41 PM, Artyom Beilis <art...@ya...> wrote:
>
> Because shared_ptr<group> is not specialized for traits...
>
> You need manually create an array and sets its memebers.i.e
>
> Something like that:
>
> cppcms::json::array &a=v.at("values",cppcms::json::array());
> a.resize(in.values_.size());
> for(size_t i = 0;i<in.values_.size();i++)
>   a[i]=*in.values_[i];
>
>
>
>
>
> Artyom Beilis
> --------------
> CppCMS - C++ Web Framework:   http://cppcms.com/
> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
>
> >________________________________
> > From: 陈抒 <csf...@gm...>
> >To: Artyom Beilis <art...@ya...>;
> cpp...@li...
> >Sent: Saturday, September 1, 2012 10:05 AM
> >Subject: Re: [Cppcms-users] Compile error: traits is not a template
> >
> >
> >Thank you. But I see new error.
> >groups.h file:
> >
> >
> >#ifndef __GROUPS_H
> >#define __GROUPS_H
> >
> >
> >#include <vector>
> >#include <boost/shared_ptr.hpp>
> >#include "group.h"
> >
> >
> >namespace kaimei{
> >
> >
> >  class groups{
> >  public:
> >    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
> >    typedef std::vector<boost::shared_ptr<group> >::const_iterator
> const_iterator;
> >
> >
> >    void add(boost::shared_ptr<group> g);
> >
> >
> >    bool empty() const;
> >
> >
> >    unsigned int size() const;
> >
> >
> >    std::string json_string() const;
> >
> >    friend class cppcms::json::traits<kaimei::groups>;
> >
> >
> >  private:
> >    std::vector<boost::shared_ptr<kaimei::group> > values_;
> >  };
> >
> >
> >}
> >
> >
> >namespace cppcms {
> >  namespace json {
> >
> >
> >    template<>
> >      struct traits<kaimei::groups> {
> >
> >
> >      static void set(value &v, kaimei::groups const& in) {
> >v.set("size", in.size());
> >v.set("values", in.values_);
> >      }
> >    };
> >
> >
> >  }
> >}
> >
> >
> >#endif
> >
> >
> >
> >
> >error message:
> >  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp,
> ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp,
> ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp,
> ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp,
> ../../src/view/login.cpp, ../../src/view/group_management.cpp
> >[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
> >In file included from
> /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
> >                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
> >                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
> >/usr/include/cppcms/json.h: In member function ‘void
> cppcms::json::value::set_value(const T&) [with T =
> boost::shared_ptr<kaimei::group>]’:
> >/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void
> cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const
> std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
> >/usr/include/cppcms/json.h:247:4:   instantiated from ‘void
> cppcms::json::value::set_value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/usr/include/cppcms/json.h:316:4:   instantiated from
> ‘cppcms::json::value::value(const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/usr/include/cppcms/json.h:352:4:   instantiated from ‘void
> cppcms::json::value::set(const char*, const T&) [with T =
> std::vector<boost::shared_ptr<kaimei::group> >]’
> >/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated
> from here
> >/usr/include/cppcms/json.h:247:4: error: incomplete type
> ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested
> name specifier
> >make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
> >make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
> >make: *** [all] Error 2
> >
> >
> >陈抒
> >Best regards
> >http://blog.csdn.net/sheismylife
> >
> >
> >
> >On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...>
> wrote:
> >
> >>
> >>
> >>>But I got error when compiling another class. It has group.h and
> group.cpp file.
> >>>
> >>>
> >>>#ifndef __GROUP_H
> >>>#define __GROUP_H
> >>>
> >>>
> >>>#include <string>
> >>>
> >>>
> >>>namespace kaimei{
> >>>...
> >>
> >>}
> >>>
> >>>
> >>>namespace cppcms {
> >>>  namespace json {
> >>>    template<>
> >>>      struct traits<kaimei::group> {
> >>>...
> >>>      }
> >>>  }
> >>>}
> >>>
> >>>
> >>>
> >>> [snip]
> >>
> >>>
> >>>I am not good at template programming. Why did this happen?
> >>>
> >>
> >>You can't specialize undefined struct - you need to include
> <cppcms/json.h>
> >>header. It provides the original traits struct and than you specialize
> it for
> >>your type of class
> >>
> >>
> >>
> >>>
> >>>陈抒
> >>>Best regards
> >>>http://blog.csdn.net/sheismylife
> >>>
> >>
> >>Regards,
> >>Artyom
> >>
> >>
>
> >>------------------------------------------------------------------------------
> >>Live Security Virtual Conference
> >>Exclusive live event will cover all the ways today's security and
> >>threat landscape has changed and how IT managers can respond. Discussions
> >>will include endpoint security, mobile security and the latest in malware
> >>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> >>_______________________________________________
> >>Cppcms-users mailing list
> >>Cpp...@li...
> >>https://lists.sourceforge.net/lists/listinfo/cppcms-users
> >>
> >
>
> >------------------------------------------------------------------------------
> >Live Security Virtual Conference
> >Exclusive live event will cover all the ways today's security and
> >threat landscape has changed and how IT managers can respond. Discussions
> >will include endpoint security, mobile security and the latest in malware
> >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> >_______________________________________________
> >Cppcms-users mailing list
> >Cpp...@li...
> >https://lists.sourceforge.net/lists/listinfo/cppcms-users
> >
> >
> >
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Cppcms-users mailing list
> Cpp...@li...
> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>

Re: [Cppcms-users] Compile error: traits is not a template

From: 陈抒 <csf...@gm...> - 2012-09-01 13:27:24

Also, when I said deep copy, I mean the following codes:

for(size_t i = 0;i<in.values_.size();i++)
  a[i]=*in.values_[i];


陈抒
Best regards
http://blog.csdn.net/sheismylife


On Sat, Sep 1, 2012 at 9:24 PM, 陈抒 <csf...@gm...> wrote:

> I tried you codes the first time. It can't be compiled.
>
> $ make
> Scanning dependencies of target cppweb
> [  3%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
> In file included from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:0:
> /home/chenshu/work/kaimei/cppweb/include/groups.h: In static member
> function ‘static void
> cppcms::json::traits<kaimei::groups>::set(cppcms::json::value&, const
> kaimei::groups&)’:
> /home/chenshu/work/kaimei/cppweb/include/groups.h:39:60: error: invalid
> initialization of non-const reference of type ‘cppcms::json::array& {aka
> std::vector<cppcms::json::value>&}’ from an rvalue of type ‘void’
>  make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
> make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
> make: *** [all] Error 2
>
> line 39 is :
>  cppcms::json::array &a=v.at("values",cppcms::json::array());
>
> I upgraded CppCMS to latest version, also read your API document.
> It seems your 'at' member function return 'void'
>
> 陈抒
> Best regards
> http://blog.csdn.net/sheismylife
>
>
> On Sat, Sep 1, 2012 at 9:15 PM, Artyom Beilis <art...@ya...> wrote:
>
>> You hadn't read my code correctly
>>
>> cppcms::json::array &a=v.at("values",cppcms::json::array());
>>
>> a is a reference and you fill it.
>>
>> Anyway read the cppcms::json::value reference documentation for further
>> details
>>
>> Artyom Beilis
>> --------------
>> CppCMS - C++ Web Framework:   http://cppcms.com/
>> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>
>>   ------------------------------
>> *From:* 陈抒 <csf...@gm...>
>> *To:* Artyom Beilis <art...@ya...>;
>> cpp...@li...
>> *Sent:* Saturday, September 1, 2012 3:32 PM
>>
>> *Subject:* Re: [Cppcms-users] Compile error: traits is not a template
>>
>> I changed your codes a bit.
>> namespace cppcms {
>>   namespace json {
>>
>>     template<>
>>       struct traits<kaimei::groups> {
>>
>>        static void set(value &v, kaimei::groups const& in) {
>> v.set("size", in.size());
>> cppcms::json::array a;
>>  a.resize(in.values_.size());
>> for(size_t i = 0; i < in.values_.size(); i++) {
>>   a[i]=*in.values_[i];
>> }
>> v.set("values", a);
>>       }
>>     };
>>
>>   }
>> }
>>
>> Two issues:
>> 1. This way is not efficient, a lot of deep copy would occur when copying
>> vector from array.
>> My original way is very simple, create a stringstream object, groups
>> object converts all member variables into string, append them to
>> stringstream. It does not looks elegant, but faster.
>> 2. It doesn't work. I got an exception:
>> cppcms::json::bad_cast:  error converting from object
>>
>>
>> 陈抒
>> Best regards
>> http://blog.csdn.net/sheismylife
>>
>>
>> On Sat, Sep 1, 2012 at 5:41 PM, Artyom Beilis <art...@ya...>wrote:
>>
>> Because shared_ptr<group> is not specialized for traits...
>>
>> You need manually create an array and sets its memebers.i.e
>>
>> Something like that:
>>
>> cppcms::json::array &a=v.at("values",cppcms::json::array());
>> a.resize(in.values_.size());
>> for(size_t i = 0;i<in.values_.size();i++)
>>   a[i]=*in.values_[i];
>>
>>
>>
>>
>>
>> Artyom Beilis
>> --------------
>> CppCMS - C++ Web Framework:   http://cppcms.com/
>> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>
>>
>>
>> >________________________________
>> > From: 陈抒 <csf...@gm...>
>> >To: Artyom Beilis <art...@ya...>;
>> cpp...@li...
>> >Sent: Saturday, September 1, 2012 10:05 AM
>> >Subject: Re: [Cppcms-users] Compile error: traits is not a template
>> >
>> >
>> >Thank you. But I see new error.
>> >groups.h file:
>> >
>> >
>> >#ifndef __GROUPS_H
>> >#define __GROUPS_H
>> >
>> >
>> >#include <vector>
>> >#include <boost/shared_ptr.hpp>
>> >#include "group.h"
>> >
>> >
>> >namespace kaimei{
>> >
>> >
>> >  class groups{
>> >  public:
>> >    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
>> >    typedef std::vector<boost::shared_ptr<group> >::const_iterator
>> const_iterator;
>> >
>> >
>> >    void add(boost::shared_ptr<group> g);
>> >
>> >
>> >    bool empty() const;
>> >
>> >
>> >    unsigned int size() const;
>> >
>> >
>> >    std::string json_string() const;
>> >
>> >    friend class cppcms::json::traits<kaimei::groups>;
>> >
>> >
>> >  private:
>> >    std::vector<boost::shared_ptr<kaimei::group> > values_;
>> >  };
>> >
>> >
>> >}
>> >
>> >
>> >namespace cppcms {
>> >  namespace json {
>> >
>> >
>> >    template<>
>> >      struct traits<kaimei::groups> {
>> >
>> >
>> >      static void set(value &v, kaimei::groups const& in) {
>> >v.set("size", in.size());
>> >v.set("values", in.values_);
>> >      }
>> >    };
>> >
>> >
>> >  }
>> >}
>> >
>> >
>> >#endif
>> >
>> >
>> >
>> >
>> >error message:
>> >  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp,
>> ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp,
>> ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp,
>> ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp,
>> ../../src/view/login.cpp, ../../src/view/group_management.cpp
>> >[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
>> >In file included from
>> /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
>> >                 from
>> /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
>> >                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
>> >/usr/include/cppcms/json.h: In member function ‘void
>> cppcms::json::value::set_value(const T&) [with T =
>> boost::shared_ptr<kaimei::group>]’:
>> >/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void
>> cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const
>> std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
>> >/usr/include/cppcms/json.h:247:4:   instantiated from ‘void
>> cppcms::json::value::set_value(const T&) [with T =
>> std::vector<boost::shared_ptr<kaimei::group> >]’
>> >/usr/include/cppcms/json.h:316:4:   instantiated from
>> ‘cppcms::json::value::value(const T&) [with T =
>> std::vector<boost::shared_ptr<kaimei::group> >]’
>> >/usr/include/cppcms/json.h:352:4:   instantiated from ‘void
>> cppcms::json::value::set(const char*, const T&) [with T =
>> std::vector<boost::shared_ptr<kaimei::group> >]’
>> >/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated
>> from here
>> >/usr/include/cppcms/json.h:247:4: error: incomplete type
>> ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested
>> name specifier
>> >make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
>> >make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
>> >make: *** [all] Error 2
>> >
>> >
>> >陈抒
>> >Best regards
>> >http://blog.csdn.net/sheismylife
>> >
>> >
>> >
>> >On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...>
>> wrote:
>> >
>> >>
>> >>
>> >>>But I got error when compiling another class. It has group.h and
>> group.cpp file.
>> >>>
>> >>>
>> >>>#ifndef __GROUP_H
>> >>>#define __GROUP_H
>> >>>
>> >>>
>> >>>#include <string>
>> >>>
>> >>>
>> >>>namespace kaimei{
>> >>>...
>> >>
>> >>}
>> >>>
>> >>>
>> >>>namespace cppcms {
>> >>>  namespace json {
>> >>>    template<>
>> >>>      struct traits<kaimei::group> {
>> >>>...
>> >>>      }
>> >>>  }
>> >>>}
>> >>>
>> >>>
>> >>>
>> >>> [snip]
>> >>
>> >>>
>> >>>I am not good at template programming. Why did this happen?
>> >>>
>> >>
>> >>You can't specialize undefined struct - you need to include
>> <cppcms/json.h>
>> >>header. It provides the original traits struct and than you specialize
>> it for
>> >>your type of class
>> >>
>> >>
>> >>
>> >>>
>> >>>陈抒
>> >>>Best regards
>> >>>http://blog.csdn.net/sheismylife
>> >>>
>> >>
>> >>Regards,
>> >>Artyom
>> >>
>> >>
>>
>> >>------------------------------------------------------------------------------
>> >>Live Security Virtual Conference
>> >>Exclusive live event will cover all the ways today's security and
>> >>threat landscape has changed and how IT managers can respond.
>> Discussions
>> >>will include endpoint security, mobile security and the latest in
>> malware
>> >>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> >>_______________________________________________
>> >>Cppcms-users mailing list
>> >>Cpp...@li...
>> >>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>> >>
>> >
>>
>> >------------------------------------------------------------------------------
>> >Live Security Virtual Conference
>> >Exclusive live event will cover all the ways today's security and
>> >threat landscape has changed and how IT managers can respond. Discussions
>> >will include endpoint security, mobile security and the latest in malware
>> >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> >_______________________________________________
>> >Cppcms-users mailing list
>> >Cpp...@li...
>> >https://lists.sourceforge.net/lists/listinfo/cppcms-users
>> >
>> >
>> >
>>
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Cppcms-users mailing list
>> Cpp...@li...
>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Cppcms-users mailing list
>> Cpp...@li...
>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Live Security Virtual Conference
>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
>> Cppcms-users mailing list
>> Cpp...@li...
>> https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>

Re: [Cppcms-users] Compile error: traits is not a template

From: Artyom B. <art...@ya...> - 2012-09-01 13:57:07

I don't remember exact API from the head, try - there are plenty ways to do stuff 

http://cppcms.com/wikipp/en/page/cppcms_1x_json

For example, this works..

        std::vector<booster::shared_ptr<int> > vals;
        vals.push_back(booster::shared_ptr<int>( new int(1)));
        vals.push_back(booster::shared_ptr<int>( new int(2)));

        cppcms::json::value v;
        v["x"]=cppcms::json::array();
        cppcms::json::array &a = v["x"].array();

        a.resize(vals.size());

        for(size_t i = 0;i<vals.size();i++)
                a[i] = *vals[i];

        std::cout << v << std::endl;



Also if you don't want to do copy... use cppcms::json::value::swap

That not that hard :-)

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/



>________________________________
> From: 陈抒 <csf...@gm...>
>To: Artyom Beilis <art...@ya...>; cpp...@li... 
>Sent: Saturday, September 1, 2012 4:26 PM
>Subject: Re: [Cppcms-users] Compile error: traits is not a template
> 
>
>Also, when I said deep copy, I mean the following codes:
>
>
>for(size_t i = 0;i<in.values_.size();i++)
>  a[i]=*in.values_[i];
>
>
>
>陈抒 
>Best regards
>http://blog.csdn.net/sheismylife
>
>
>
>On Sat, Sep 1, 2012 at 9:24 PM, 陈抒 <csf...@gm...> wrote:
>
>I tried you codes the first time. It can't be compiled.
>>
>>
>>$ make
>>Scanning dependencies of target cppweb
>>[  3%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
>>In file included from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:0:
>>/home/chenshu/work/kaimei/cppweb/include/groups.h: In static member function ‘static void cppcms::json::traits<kaimei::groups>::set(cppcms::json::value&, const kaimei::groups&)’:
>>/home/chenshu/work/kaimei/cppweb/include/groups.h:39:60: error: invalid initialization of non-const reference of type ‘cppcms::json::array& {aka std::vector<cppcms::json::value>&}’ from an rvalue of type ‘void’
>>make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
>>make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
>>make: *** [all] Error 2
>>
>>
>>line 39 is :
>>cppcms::json::array &a=v.at("values",cppcms::json::array());
>>
>>
>>I upgraded CppCMS to latest version, also read your API document.
>>It seems your 'at' member function return 'void'
>>
>>陈抒 
>>Best regards
>>http://blog.csdn.net/sheismylife
>>
>>
>>
>>On Sat, Sep 1, 2012 at 9:15 PM, Artyom Beilis <art...@ya...> wrote:
>>
>>You hadn't read my code correctly
>>>
>>>
>>>cppcms::json::array &a=v.at("values",cppcms::json::array());
>>>
>>>
>>>a is a reference and you fill it.
>>>
>>>
>>>Anyway read the cppcms::json::value reference documentation for further details
>>>
>>> 
>>>Artyom Beilis
>>>--------------
>>>CppCMS - C++ Web Framework:   http://cppcms.com/
>>>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>>
>>>
>>>
>>>>________________________________
>>>> From: 陈抒 <csf...@gm...>
>>>>To: Artyom Beilis <art...@ya...>; cpp...@li... 
>>>>Sent: Saturday, September 1, 2012 3:32 PM
>>>>
>>>>Subject: Re: [Cppcms-users] Compile error: traits is not a template
>>>> 
>>>>
>>>>
>>>>I changed your codes a bit. 
>>>>namespace cppcms {
>>>>  namespace json {
>>>>
>>>>
>>>>    template<>
>>>>      struct traits<kaimei::groups> {
>>>>
>>>>
>>>>      static void set(value &v, kaimei::groups const& in) {
>>>>v.set("size", in.size());
>>>>cppcms::json::array a;
>>>>a.resize(in.values_.size());
>>>>for(size_t i = 0; i < in.values_.size(); i++) {
>>>>  a[i]=*in.values_[i];
>>>>}
>>>>v.set("values", a);
>>>>      }
>>>>    };
>>>>
>>>>
>>>>  }
>>>>}
>>>>
>>>>
>>>>Two issues:
>>>>1. This way is not efficient, a lot of deep copy would occur when copying vector from array.
>>>>My original way is very simple, create a stringstream object, groups object converts all member variables into string, append them to stringstream. It does not looks elegant, but faster. 
>>>>2. It doesn't work. I got an exception:
>>>>cppcms::json::bad_cast:  error converting from object
>>>>
>>>>
>>>>陈抒 
>>>>Best regards
>>>>http://blog.csdn.net/sheismylife
>>>>
>>>>
>>>>
>>>>On Sat, Sep 1, 2012 at 5:41 PM, Artyom Beilis <art...@ya...> wrote:
>>>>
>>>>Because shared_ptr<group> is not specialized for traits...
>>>>>
>>>>>You need manually create an array and sets its memebers.i.e
>>>>>
>>>>>Something like that:
>>>>>
>>>>>cppcms::json::array &a=v.at("values",cppcms::json::array());
>>>>>a.resize(in.values_.size());
>>>>>for(size_t i = 0;i<in.values_.size();i++)
>>>>>  a[i]=*in.values_[i];
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>Artyom Beilis
>>>>>--------------
>>>>>CppCMS - C++ Web Framework:   http://cppcms.com/
>>>>>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>>>>
>>>>>
>>>>>
>>>>>>________________________________
>>>>>> From: 陈抒 <csf...@gm...>
>>>>>>To: Artyom Beilis <art...@ya...>; cpp...@li...
>>>>>>Sent: Saturday, September 1, 2012 10:05 AM
>>>>>>Subject: Re: [Cppcms-users] Compile error: traits is not a template
>>>>>
>>>>>>
>>>>>>
>>>>>>Thank you. But I see new error.
>>>>>>groups.h file:
>>>>>>
>>>>>>
>>>>>>#ifndef __GROUPS_H
>>>>>>#define __GROUPS_H
>>>>>>
>>>>>>
>>>>>>#include <vector>
>>>>>>#include <boost/shared_ptr.hpp>
>>>>>>#include "group.h"
>>>>>>
>>>>>>
>>>>>>namespace kaimei{
>>>>>>
>>>>>>
>>>>>>  class groups{
>>>>>>  public:
>>>>>>    typedef std::vector<boost::shared_ptr<group> >::iterator iterator;
>>>>>>    typedef std::vector<boost::shared_ptr<group> >::const_iterator const_iterator;
>>>>>>
>>>>>>
>>>>>>    void add(boost::shared_ptr<group> g);
>>>>>>
>>>>>>
>>>>>>    bool empty() const;
>>>>>>
>>>>>>
>>>>>>    unsigned int size() const;
>>>>>>
>>>>>>
>>>>>>    std::string json_string() const;
>>>>>>    
>>>>>>    friend class cppcms::json::traits<kaimei::groups>;
>>>>>>
>>>>>>
>>>>>>  private:
>>>>>>    std::vector<boost::shared_ptr<kaimei::group> > values_;
>>>>>>  };
>>>>>>
>>>>>>
>>>>>>}
>>>>>>
>>>>>>
>>>>>>namespace cppcms {
>>>>>>  namespace json {
>>>>>>
>>>>>>
>>>>>>    template<>
>>>>>>      struct traits<kaimei::groups> {
>>>>>>
>>>>>>
>>>>>>      static void set(value &v, kaimei::groups const& in) {
>>>>>>v.set("size", in.size());
>>>>>>v.set("values", in.values_);
>>>>>>      }
>>>>>>    };
>>>>>>
>>>>>>
>>>>>>  }
>>>>>>}
>>>>>>
>>>>>>
>>>>>>#endif
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>error message:
>>>>>>  3%] Generating ../../src/view/welcome.cpp, ../../src/view/home.cpp, ../../src/view/gprs_message.cpp, ../../src/view/gprs_manager.cpp, ../../src/view/gprs_password.cpp, ../../src/view/gprs_log.cpp, ../../src/view/register_client.cpp, ../../src/view/gprsConfig.cpp, ../../src/view/login.cpp, ../../src/view/group_management.cpp
>>>>>>[  6%] Building CXX object bin/CMakeFiles/cppweb.dir/groups.cpp.o
>>>>>>In file included from /home/chenshu/work/kaimei/cppweb/include/group.h:5:0,
>>>>>>                 from /home/chenshu/work/kaimei/cppweb/include/groups.h:6,
>>>>>>                 from /home/chenshu/work/kaimei/cppweb/src/groups.cpp:1:
>>>>>>/usr/include/cppcms/json.h: In member function ‘void cppcms::json::value::set_value(const T&) [with T = boost::shared_ptr<kaimei::group>]’:
>>>>>>/usr/include/cppcms/json.h:604:5:   instantiated from ‘static void cppcms::json::traits<std::vector<T> >::set(cppcms::json::value&, const std::vector<T>&) [with T = boost::shared_ptr<kaimei::group>]’
>>>>>>/usr/include/cppcms/json.h:247:4:   instantiated from ‘void cppcms::json::value::set_value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>>>>/usr/include/cppcms/json.h:316:4:   instantiated from ‘cppcms::json::value::value(const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>>>>/usr/include/cppcms/json.h:352:4:   instantiated from ‘void cppcms::json::value::set(const char*, const T&) [with T = std::vector<boost::shared_ptr<kaimei::group> >]’
>>>>>>/home/chenshu/work/kaimei/cppweb/include/groups.h:39:28:   instantiated from here
>>>>>>/usr/include/cppcms/json.h:247:4: error: incomplete type ‘cppcms::json::traits<boost::shared_ptr<kaimei::group> >’ used in nested name specifier
>>>>>>make[2]: *** [bin/CMakeFiles/cppweb.dir/groups.cpp.o] Error 1
>>>>>>make[1]: *** [bin/CMakeFiles/cppweb.dir/all] Error 2
>>>>>>make: *** [all] Error 2
>>>>>>
>>>>>>
>>>>>>陈抒
>>>>>>Best regards
>>>>>>http://blog.csdn.net/sheismylife
>>>>>>
>>>>>>
>>>>>>
>>>>>>On Sat, Sep 1, 2012 at 2:34 PM, Artyom Beilis <art...@ya...> wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>But I got error when compiling another class. It has group.h and group.cpp file.
>>>>>>>>
>>>>>>>>
>>>>>>>>#ifndef __GROUP_H
>>>>>>>>#define __GROUP_H
>>>>>>>>
>>>>>>>>
>>>>>>>>#include <string>
>>>>>>>>
>>>>>>>>
>>>>>>>>namespace kaimei{
>>>>>>>>...
>>>>>>>
>>>>>>>}
>>>>>>>>
>>>>>>>>
>>>>>>>>namespace cppcms {
>>>>>>>>  namespace json {
>>>>>>>>    template<>
>>>>>>>>      struct traits<kaimei::group> {
>>>>>>>>...
>>>>>>>>      }
>>>>>>>>  }
>>>>>>>>}
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> [snip]
>>>>>>>
>>>>>>>>
>>>>>>>>I am not good at template programming. Why did this happen?
>>>>>>>>
>>>>>>>
>>>>>>>You can't specialize undefined struct - you need to include <cppcms/json.h>
>>>>>>>header. It provides the original traits struct and than you specialize it for
>>>>>>>your type of class
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>>陈抒
>>>>>>>>Best regards
>>>>>>>>http://blog.csdn.net/sheismylife
>>>>>>>>
>>>>>>>
>>>>>>>Regards,
>>>>>>>Artyom
>>>>>>>
>>>>>>>
>>>>>>>------------------------------------------------------------------------------
>>>>>>>Live Security Virtual Conference
>>>>>>>Exclusive live event will cover all the ways today's security and
>>>>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>>>>will include endpoint security, mobile security and the latest in malware
>>>>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>>>>_______________________________________________
>>>>>>>Cppcms-users mailing list
>>>>>>>Cpp...@li...
>>>>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>>>
>>>>>>
>>>>>>------------------------------------------------------------------------------
>>>>>>Live Security Virtual Conference
>>>>>>Exclusive live event will cover all the ways today's security and
>>>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>>>will include endpoint security, mobile security and the latest in malware
>>>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>>>_______________________________________________
>>>>>>Cppcms-users mailing list
>>>>>>Cpp...@li...
>>>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>>
>>>>>>
>>>>>> 
>>>>>
>>>>>------------------------------------------------------------------------------
>>>>>Live Security Virtual Conference
>>>>>Exclusive live event will cover all the ways today's security and
>>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>>will include endpoint security, mobile security and the latest in malware
>>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>>_______________________________________________
>>>>>Cppcms-users mailing list
>>>>>Cpp...@li...
>>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>
>>>>
>>>>------------------------------------------------------------------------------
>>>>Live Security Virtual Conference
>>>>Exclusive live event will cover all the ways today's security and 
>>>>threat landscape has changed and how IT managers can respond. Discussions 
>>>>will include endpoint security, mobile security and the latest in malware 
>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>_______________________________________________
>>>>Cppcms-users mailing list
>>>>Cpp...@li...
>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>
>>>>
>>>>
>>>------------------------------------------------------------------------------
>>>Live Security Virtual Conference
>>>Exclusive live event will cover all the ways today's security and
>>>threat landscape has changed and how IT managers can respond. Discussions
>>>will include endpoint security, mobile security and the latest in malware
>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>_______________________________________________
>>>Cppcms-users mailing list
>>>Cpp...@li...
>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>
>>>
>>
>
>------------------------------------------------------------------------------
>Live Security Virtual Conference
>Exclusive live event will cover all the ways today's security and 
>threat landscape has changed and how IT managers can respond. Discussions 
>will include endpoint security, mobile security and the latest in malware 
>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>_______________________________________________
>Cppcms-users mailing list
>Cpp...@li...
>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
>