pygccxml-development

[pygccxml-development] Problems wrapping C++ methods with std::vector<UserDefinedClass> arguments

[Norma Z. <nzi...@is...>]

Hi Roman,

 

Thanks for your help with my problem using std::vector<int>. As I said in my last email, my ultimate goal is to wrap  functions with a signature similar to:

 

      UserDefinedReturnValue getDevices(std::vector<UserDefinedClass> & devices)

 

I am have problems with a vector of a UserDefinedClass.

 

I have the following class:

 

#include <string>

#include <iostream>

#include <vector>

 

using namespace std;

 

enum iStorReturnType {SUCCESS, FAILURE};

 

class Device

{

public:

    Device();

    iStorReturnType setName( string );

    iStorReturnType getName( string& );

    iStorReturnType printName();

protected:

      string m_name;

};

 

In another class I have two instances of the Device class. In this class I have a function which returns one instance of the Device class with no problem. I want to also have a function to return a vector of all the devices. 

 

      iStorReturnType  getDevices(std::vector<Device>& devices);

 

In my generated file I am seeing the following error:

 

    { //scope begin

        typedef bp::class_< std::vector< Device > > vector_less__Device__grate__exposer_t;

        vector_less__Device__grate__exposer_t vector_less__Device__grate__exposer = vector_less__Device__grate__exposer_t("vector_less__Device__grate_");

        bp::scope vector_less__Device__grate__scope( vector_less__Device__grate__exposer );

        //WARNING: the next line of code will not compile, because "::Device" does not have operator== !

        vector_less__Device__grate__exposer.def( bp::vector_indexing_suite< ::std::vector< Device > >() );

    } //scope end

 

I am hoping this is the last stumbling block to being able to implement these "simple" classes. I would greatly appreciate any help you can give me.

 

I do have one other question. In the C++ code that I am trying to wrap, all the functions have an error code as the return value and the actual values you want are passed as reference parameters. Is there a way to generate the function transformations other than listing each function separately in the python script which pyplusplus uses to generate the wrappers?

 

Thanks so much for your help.

Norma

 

 

Re: [pygccxml-development] Problems wrapping C++ methods with std::vector<UserDefinedClass> arguments

[Roman Y. <rom...@gm...>]

On Feb 16, 2008 4:05 AM, Norma Zimmerman <nzi...@is...> wrote:
> Hi Roman,

Good evening

> Thanks for your help with my problem using std::vector<int>. As I said in my
> last email, my ultimate goal is to wrap  functions with a signature similar
> to:
>       UserDefinedReturnValue getDevices(std::vector<UserDefinedClass> &
> devices)
>
>
> I am have problems with a vector of a UserDefinedClass.
>
> I have the following class:
>
> #include <string>
> #include <iostream>
> #include <vector>
>
> using namespace std;
> enum iStorReturnType {SUCCESS, FAILURE};
> class Device
> {
> public:
>     Device();
>     iStorReturnType setName( string );
>     iStorReturnType getName( string& );
>     iStorReturnType printName();
> protected:
>       string m_name;
> };
>
>
>
> In another class I have two instances of the Device class. In this class I
> have a function which returns one instance of the Device class with no
> problem. I want to also have a function to return a vector of all the
> devices.
>
>
>
>       iStorReturnType  getDevices(std::vector<Device>& devices);
>
>
>
> In my generated file I am seeing the following error:
>
>
>
>     { //scope begin
>
>         typedef bp::class_< std::vector< Device > >
> vector_less__Device__grate__exposer_t;
>
>         vector_less__Device__grate__exposer_t
> vector_less__Device__grate__exposer =
> vector_less__Device__grate__exposer_t("vector_less__Device__grate_");
>
>         bp::scope vector_less__Device__grate__scope(
> vector_less__Device__grate__exposer );
>
>         //WARNING: the next line of code will not compile, because
> "::Device" does not have operator== !
>
>         vector_less__Device__grate__exposer.def( bp::vector_indexing_suite<
> ::std::vector< Device > >() );
>
>     } //scope end
>
>
>
> I am hoping this is the last stumbling block to being able to implement
> these "simple" classes. I would greatly appreciate any help you can give me.

If you can add operator== to your code. You don't have to modify the class,
you can implement is as free operator.

Or you can use "indexing suite v2". See
http://language-binding.net/pyplusplus/documentation/containers.html

> I do have one other question. In the C++ code that I am trying to wrap, all
> the functions have an error code as the return value and the actual values
> you want are passed as reference parameters. Is there a way to generate the
> function transformations other than listing each function separately in the
> python script which pyplusplus uses to generate the wrappers?

I thought this is an initial reason you started to use Py++ :-)

from pyplusplus import function_transformers as FT


mb =module_builder_t(...)
my_ns = mb.namespace( 'my namespace' )
for f in my_ns.calldefs():
    if f.arguments[ -1 ].type.decl_string == "type that represent error":
        f.add_transformation(  FT.output( len( f.arguments ) - 1 )

Is this what you want?


-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/