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//
// Boost.Pointer Container
//
// Copyright Thorsten Ottosen 2003-2007. 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 <boost/static_assert.hpp>
#include <boost/type_traits/is_void.hpp>
#include <functional>
namespace boost
{
namespace ptr_container_detail
{
template <typename Type, typename Dummy>
struct make_lazy
{
typedef typename Type::type type;
};
}
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
typename boost::result_of< const Fun( 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
typename boost::result_of< const Fun( typename pointee<T>::type&,
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)
{ }
template< class Void >
#ifdef BOOST_NO_SFINAE
Result
#else
typename ptr_container_detail::make_lazy<
boost::result_of<const Fun(const Arg1&)>, Void>::type
#endif
operator()( const Void* r ) const
{
BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
BOOST_ASSERT( r != 0 );
return fun( * static_cast<const Arg1*>( r ) );
}
template< class Void >
#ifdef BOOST_NO_SFINAE
Result
#else
typename ptr_container_detail::make_lazy<
boost::result_of<const Fun(const Arg1&, const Arg2&)>, Void>::type
#endif
operator()( const Void* l, const Void* r ) const
{
BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
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