Re: [Cppcms-users] Compile error: traits is not a template
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Re: [Cppcms-users] Compile error: traits is not a template
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From: Artyom B. <art...@ya...> - 2012-09-01 09:41:48
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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
>
>
>
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