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