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Problem find_if with bind2nd

ShotoReapre (37)
Hi!
I have the next code:

Engine.cpp

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std::list<GameScreen*>Engine::gamescreens;

void Engine::PushGameScreen(GameScreen *n_gs)
{
    if (n_gs->getEngine() !=  NULL)
    {
        ExitOnGLError("ERROR: This Gamescreen exist in the stack of other Engine");
    }


    // Miramos si hay un GameScreen igual en la pila de GameScreens
    list<GameScreen*>::iterator result = find_if(
                                          gamescreens.begin(),
                                          gamescreens.end(),
                                          bind2nd<CompareGS>(CompareGS(),n_gs)//LINE 223
                                          );
    // Si es unico este GameScreen enviado, lo añadimos a la pila. Sino, avisamos de que ya existe
    if(result == gamescreens.end())
    {
        n_gs->setEngine(this);
        n_gs->LoadGameScreen();
        gamescreens.push_back(n_gs);
    }
    else
    {
        cout<<"INFO: This Gamescreen has already been loaded "<<endl;
    }
}


GameScreen.hpp

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struct CompareGS : public std::binary_function < GameScreen, GameScreen, bool>
        {
            bool operator() (const GameScreen& gs1, const GameScreen value) const
            {
                return (gs1 == value);
            }
        };


And I have the next log:

c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/backward/binders.h: In function 'std::binder2nd<_Operation> std::bind2nd(const _Operation&, const _Tp&) [with _Operation = CompareGS, _Tp = GameScreen*]':
C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\Engine.cpp:223: instantiated from here
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/backward/binders.h:162: error: no matching function for call to 'GameScreen::GameScreen(GameScreen* const&)'
C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\../../include/../include/GameScreen.hpp:20: note: candidates are: GameScreen::GameScreen(std::string)
C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\../../include/../include/GameScreen.hpp:17: note: GameScreen::GameScreen(const GameScreen&)
In file included from c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/algorithm:62,
from C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\../../include/Engine.hpp:6,
from C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\Engine.cpp:1:
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/bits/stl_algo.h: In function '_InputIterator std::__find_if(_InputIterator, _InputIterator, _Predicate, std::input_iterator_tag) [with _InputIterator = std::_List_iterator<GameScreen*>, _Predicate = std::binder2nd<CompareGS>]':
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/bits/stl_algo.h:4248: instantiated from '_IIter std::find_if(_IIter, _IIter, _Predicate) [with _IIter = std::_List_iterator<GameScreen*>, _Predicate = std::binder2nd<CompareGS>]'
C:\Users\Héctor\Documents\Visual Studio 2010\Projects\GekkoEngine\src\Framework\Engine.cpp:224: instantiated from here
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/bits/stl_algo.h:158: error: no match for call to '(std::binder2nd<CompareGS>) (GameScreen*&)'
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/backward/binders.h:146: note: candidates are: typename _Operation::result_type std::binder2nd<_Operation>::operator()(const typename _Operation::first_argument_type&) const [with _Operation = CompareGS]
c:\program files\codeblocks\mingw\bin\../lib/gcc/mingw32/4.4.1/include/c++/backward/binders.h:152: note: typename _Operation::result_type std::binder2nd<_Operation>::operator()(typename _Operation::first_argument_type&) const [with _Operation = CompareGS]

When I compile, CodeBlocks open two files, binders.h and stl_algo.h.

Does anyone know why this happens?
Last edited on
ajh32 (659)
Your list holds GameScreen pointers, so your binary function needs to have both it's arguments as GameScreen pointers.
ShotoReapre (37)
Ok. thanks. that is the problem.
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