//

// Boost.Pointer Container

//

//  Copyright Thorsten Ottosen 2003-2005. Use, modification and

//  distribution is subject to the Boost Software License, Version

//  1.0. (See accompanying file LICENSE_1_0.txt or copy at

//  http://www.boost.org/LICENSE_1_0.txt)

//

// For more information, see http://www.boost.org/libs/ptr_container/

//

#ifndef BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP

#define BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)

    #pragma once

#endif

#include <boost/config.hpp>

#ifdef BOOST_NO_SFINAE

#else

#include <boost/utility/result_of.hpp>

#include <boost/pointee.hpp>

#endif // BOOST_NO_SFINAE

#include <boost/assert.hpp>

#include <functional>

namespace boost

{

    template

    < 

              class Fun

#ifdef BOOST_NO_SFINAE

            , class Result = bool

#endif        

    >

    class indirect_fun

    {

        Fun fun;

    public:

        indirect_fun() : fun(Fun())

        { }

        indirect_fun( Fun f ) : fun(f)

        { }

        template< class T >

#ifdef BOOST_NO_SFINAE

        Result    

#else            

        BOOST_DEDUCED_TYPENAME result_of< Fun( BOOST_DEDUCED_TYPENAME pointee<T>::type ) >::type 

#endif            

        operator()( const T& r ) const

        { 

            return fun( *r );

        }

        template< class T, class U >

#ifdef BOOST_NO_SFINAE

        Result    

#else                        

        BOOST_DEDUCED_TYPENAME result_of< Fun( BOOST_DEDUCED_TYPENAME pointee<T>::type, 

                                               BOOST_DEDUCED_TYPENAME pointee<U>::type ) >::type

#endif            

        operator()( const T& r, const U& r2 ) const

        { 

            return fun( *r, *r2 ); 

        }

    };

    template< class Fun >

    inline indirect_fun<Fun> make_indirect_fun( Fun f )

    {

        return indirect_fun<Fun>( f );

    }

    template

    < 

        class Fun, 

        class Arg1, 

        class Arg2 = Arg1 

#ifdef BOOST_NO_SFINAE

      , class Result = bool   

#endif           

    >

    class void_ptr_indirect_fun

    {

        Fun fun;

    public:

        void_ptr_indirect_fun() : fun(Fun())

        { }

        void_ptr_indirect_fun( Fun f ) : fun(f)

        { }

#ifdef BOOST_NO_SFINAE

        Result    

#else            

        BOOST_DEDUCED_TYPENAME result_of< Fun( Arg1 ) >::type 

#endif            

        operator()( const void* r ) const

        { 

            BOOST_ASSERT( r != 0 );

            return fun( * static_cast<const Arg1*>( r ) );

        }

#ifdef BOOST_NO_SFINAE

        Result    

#else                    

        BOOST_DEDUCED_TYPENAME result_of< Fun( Arg1, Arg2 ) >::type 

#endif            

        operator()( const void* l, const void* r ) const

        { 

            BOOST_ASSERT( l != 0 && r != 0 );

            return fun( * static_cast<const Arg1*>( l ), * static_cast<const Arg2*>( r ) );

        }

    };

    template< class Arg, class Fun >

    inline void_ptr_indirect_fun<Fun,Arg> make_void_ptr_indirect_fun( Fun f )

    {

        return void_ptr_indirect_fun<Fun,Arg>( f );

    }

} // namespace 'boost'

#endif