| // |
| // 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 |