boost::binding that which is already bound

Posted by PaulH on Stack Overflow See other posts from Stack Overflow or by PaulH
Published on 2010-04-12T20:45:01Z Indexed on 2010/04/12 20:52 UTC
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I have a Visual Studio 2008 C++ application that does something like this:

template< typename Fcn >
inline void Bar( Fcn fcn )  // line 84
{
    fcn();
};

template< typename Fcn >
inline void Foo( Fcn fcn )
{
    // this works fine
    Bar( fcn );

    // this fails to compile
    boost::bind( Bar, fcn )();
};

void main()
{
    SYSTEM_POWER_STATUS_EX status = { 0 };
    Foo( boost::bind( ::GetSystemPowerStatusEx, &status, true ) );  // line 160
}

*The call to GetSystemPowerStatusEx() is just for demonstration. Insert your favorite call there and the behavior is the same.

When I go to compile this, I get 84 errors. I won't post them all unless asked, but they start with this:

1>.\MyApp.cpp(99) : error C2896: 'boost::_bi::bind_t<_bi::dm_result<MT::* ,A1>::type,boost::_mfi::dm<M,T>,_bi::list_av_1<A1>::type> boost::bind(M T::* ,A1)' : cannot use function template 'void Bar(Fcn)' as a function argument
1>        .\MyApp.cpp(84) : see declaration of 'Bar'
1>        .\MyApp.cpp(160) : see reference to function template instantiation 'void Foo<boost::_bi::bind_t<R,F,L>>(Fcn)' being compiled
1>        with
1>        [
1>            R=BOOL,
1>            F=BOOL (__cdecl *)(PSYSTEM_POWER_STATUS_EX,BOOL),
1>            L=boost::_bi::list2<boost::_bi::value<_SYSTEM_POWER_STATUS_EX *>,boost::_bi::value<bool>>,
1>            Fcn=boost::_bi::bind_t<BOOL,BOOL (__cdecl *)(PSYSTEM_POWER_STATUS_EX,BOOL),boost::_bi::list2<boost::_bi::value<_SYSTEM_POWER_STATUS_EX *>,boost::_bi::value<bool>>>
1>        ]

If anybody can point out what I may be doing wrong, I would appreciate it.

Thanks, PaulH

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