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85 lines
2.2 KiB
85 lines
2.2 KiB
// |
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// Boost.Pointer Container |
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// |
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// Copyright Thorsten Ottosen 2003-2005. 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_INDIRECT_CONTAINER_NULLABLE_HPP |
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#define BOOST_INDIRECT_CONTAINER_NULLABLE_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/type_traits/detail/yes_no_type.hpp> |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/identity.hpp> |
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#include <boost/config.hpp> |
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namespace boost |
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{ |
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template< class T > |
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struct nullable |
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{ |
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typedef T type; |
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}; |
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namespace ptr_container_detail |
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{ |
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template< class T > |
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type_traits::yes_type is_nullable( const nullable<T>* ); |
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type_traits::no_type is_nullable( ... ); |
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} |
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template< class T > |
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struct is_nullable |
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{ |
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private: |
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BOOST_STATIC_CONSTANT( T*, var ); |
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public: |
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) |
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#pragma warning(push) |
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#pragma warning(disable:6334) |
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#endif |
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BOOST_STATIC_CONSTANT(bool, value = sizeof( ptr_container_detail::is_nullable( var ) ) |
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== sizeof( type_traits::yes_type ) ); |
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) |
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#pragma warning(pop) |
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#endif |
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}; |
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template< class T > |
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struct remove_nullable |
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{ |
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typedef BOOST_DEDUCED_TYPENAME mpl::eval_if< is_nullable<T>, |
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T, |
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mpl::identity<T> >::type |
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type; |
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}; |
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namespace ptr_container_detail |
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{ |
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template< class T > |
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struct void_ptr |
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{ |
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typedef BOOST_DEDUCED_TYPENAME |
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mpl::if_c< boost::is_const< |
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BOOST_DEDUCED_TYPENAME boost::remove_nullable<T>::type >::value, |
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const void*, void* >::type type; |
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}; |
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} |
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} |
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#endif
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