[boost] [bind] function_equal with nested binds

From: Sylvester-Bradley, Gareth (Gareth.Sylvester-Bradley_at_[hidden])
Date: 2008-07-17 04:45:40

Should function_equal work with nested binds?

 

I expected the following to work but it results in a compiler error:

 

 

#include <boost/function_equal.hpp>

#include <boost/bind.hpp>

 

void f( int ) {}

int g( int i ) { return i+5; }

 

template < typename F > bool self_equal( F f_ )

{

  return function_equal( f_, f_ );

}

 

int main( int argc, char * const argv[] )

{

  self_equal( boost::bind( f, _1 ) ); // OK

  self_equal( boost::bind( g, _1 ) ); // OK

  self_equal( boost::bind( f, boost::bind( g, _1 ) ) ); // compiler
error

}

 

 

I made it compile by adding the following:

 

namespace boost

{

  namespace _bi

  {

    template<class R, class F, class L> bool ref_compare( bind_t<R,F,L>
const & a, bind_t<R,F,L> const & b, long )

    {

      return a.compare(b);

    }

  }

}

 

Is that OK?

 

 

Thanks,

Gareth

 

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