Chris@16: //
Chris@16: // Boost.Pointer Container
Chris@16: //
Chris@16: //  Copyright Thorsten Ottosen 2003-2007. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/ptr_container/
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP
Chris@16: #define BOOST_PTR_CONTAINER_INDIRECT_FUN_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16:     #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16: #else
Chris@16: #include <boost/utility/result_of.hpp>
Chris@16: #include <boost/pointee.hpp>
Chris@16: #endif // BOOST_NO_SFINAE
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/static_assert.hpp>
Chris@16: #include <boost/type_traits/is_void.hpp>
Chris@16: #include <functional>
Chris@16: 
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16:     namespace ptr_container_detail
Chris@16:     {
Chris@16:         template <typename Type, typename Dummy>
Chris@16:         struct make_lazy
Chris@16:         {
Chris@16:             typedef typename Type::type type;
Chris@16:         };
Chris@16:     }
Chris@16:     
Chris@16:     template
Chris@16:     < 
Chris@16:               class Fun
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:             , class Result = bool
Chris@16: #endif        
Chris@16:     >
Chris@16:     class indirect_fun
Chris@16:     {
Chris@16:         Fun fun;
Chris@16:     public:
Chris@16:         indirect_fun() : fun(Fun())
Chris@16:         { }
Chris@16:         
Chris@16:         indirect_fun( Fun f ) : fun(f)
Chris@16:         { }
Chris@16:     
Chris@16:         template< class T >
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:         Result    
Chris@16: #else            
Chris@16:         typename boost::result_of< const Fun( typename pointee<T>::type& ) >::type 
Chris@16: #endif            
Chris@16:         operator()( const T& r ) const
Chris@16:         { 
Chris@16:             return fun( *r );
Chris@16:         }
Chris@16:     
Chris@16:         template< class T, class U >
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:         Result    
Chris@16: #else                        
Chris@16:         typename boost::result_of< const Fun( typename pointee<T>::type&,
Chris@16:                                               typename pointee<U>::type& ) >::type
Chris@16: #endif            
Chris@16:         operator()( const T& r, const U& r2 ) const
Chris@16:         { 
Chris@16:             return fun( *r, *r2 ); 
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template< class Fun >
Chris@16:     inline indirect_fun<Fun> make_indirect_fun( Fun f )
Chris@16:     {
Chris@16:         return indirect_fun<Fun>( f );
Chris@16:     }
Chris@16: 
Chris@16: 
Chris@16:     template
Chris@16:     < 
Chris@16:         class Fun, 
Chris@16:         class Arg1, 
Chris@16:         class Arg2 = Arg1 
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:       , class Result = bool   
Chris@16: #endif           
Chris@16:     >
Chris@16:     class void_ptr_indirect_fun
Chris@16:     {
Chris@16:         Fun fun;
Chris@16:                 
Chris@16:     public:
Chris@16:         
Chris@16:         void_ptr_indirect_fun() : fun(Fun())
Chris@16:         { }
Chris@16: 
Chris@16:         void_ptr_indirect_fun( Fun f ) : fun(f)
Chris@16:         { }
Chris@16:         
Chris@16:         template< class Void >
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:         Result    
Chris@16: #else            
Chris@16:         typename ptr_container_detail::make_lazy<
Chris@16:             boost::result_of<const Fun(const Arg1&)>, Void>::type
Chris@16: #endif            
Chris@16:         operator()( const Void* r ) const
Chris@16:         { 
Chris@16:             BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
Chris@16:             BOOST_ASSERT( r != 0 );
Chris@16:             return fun( * static_cast<const Arg1*>( r ) );
Chris@16:         }
Chris@16: 
Chris@16:         template< class Void >
Chris@16: #ifdef BOOST_NO_SFINAE
Chris@16:         Result    
Chris@16: #else                    
Chris@16:         typename ptr_container_detail::make_lazy<
Chris@16:             boost::result_of<const Fun(const Arg1&, const Arg2&)>, Void>::type
Chris@16: #endif            
Chris@16:         operator()( const Void* l, const Void* r ) const
Chris@16:         { 
Chris@16:             BOOST_STATIC_ASSERT(boost::is_void<Void>::value);
Chris@16:             BOOST_ASSERT( l != 0 && r != 0 );
Chris@16:             return fun( * static_cast<const Arg1*>( l ), * static_cast<const Arg2*>( r ) );
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template< class Arg, class Fun >
Chris@16:     inline void_ptr_indirect_fun<Fun,Arg> make_void_ptr_indirect_fun( Fun f )
Chris@16:     {
Chris@16:         return void_ptr_indirect_fun<Fun,Arg>( f );
Chris@16:     }
Chris@16:      
Chris@16: } // namespace 'boost'
Chris@16: 
Chris@16: #endif