[boost] [function] support for overloaded function

Subject: [boost] [function] support for overloaded function
From: Oliver Kowalke (k-oli_at_[hidden])
Date: 2008-10-30 04:35:36

Hello,
how can I support the return type of bind as well as function as function argument in following code.

regards,
Oliver

#include <iostream>
#include <cstdlib>
#include <stdexcept>

#include <boost/bind.hpp>
#include <boost/function.hpp>

struct X {};

struct Y
{
       template< typename R >
       void f( boost::function< R() > const& fn)
       {}

       template< typename R >
       void f( boost::function< R( X &) > const& fn)
       {}
};

struct Z
{
       int u( int i)
       { return i; }

       int v( X & x, int i)
       { return i; }
};

int main( int argc, char *argv[])
{
        try
       {
              Y y;
              X x;
              Z z;

              // does not compile
              y.f(
                     boost::bind(
                            & Z::u,
                            z,
                            1) );

              boost::function< int() > fn1(
                     boost::bind(
                            & Z::u,
                            z,
                            1) );
              y.f( fn1);

              // does not compile
              y.f(
                     boost::bind(
                            & Z::v,
                            z,
                            _1,
                            1) );

              boost::function< int( X &) > fn2(
                     boost::bind(
                            & Z::v,
                            z,
                            _1,
                            1) );
              y.f( fn2);

              return EXIT_SUCCESS;
       }
       catch ( std::exception const& e)
       { std::cerr << e.what() << std::endl; }
       catch ( ... )
       { std::cerr << "unhandled" << std::endl; }

       return EXIT_FAILURE;
}

-- 
Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten 
Browser-Versionen downloaden: http://www.gmx.net/de/go/browser