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97 lines
2.4 KiB
97 lines
2.4 KiB
6 years ago
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// Copyright (c) 2009 Rutger ter Borg
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (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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#ifndef BOOST_NUMERIC_BINDINGS_DETAIL_GET_HPP
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#define BOOST_NUMERIC_BINDINGS_DETAIL_GET_HPP
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#include <boost/numeric/bindings/detail/adaptor.hpp>
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#include <boost/preprocessor/repetition.hpp>
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#include <boost/preprocessor/cat.hpp>
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namespace boost {
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namespace numeric {
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namespace bindings {
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namespace detail {
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template< typename Key >
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struct get_dispatch {};
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#define GENERATE_GET( z, which, unused ) \
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template<> \
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struct get_dispatch< tag::size_type<which> > { \
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template< typename T > \
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static std::ptrdiff_t invoke( const T& t ) { \
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return detail::adaptor_access<T>:: \
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BOOST_PP_CAT( size, which )( t ); \
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} \
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};\
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\
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template<> \
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struct get_dispatch< tag::stride_type<which> > { \
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template< typename T > \
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static std::ptrdiff_t invoke( const T& t ) { \
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return detail::adaptor_access<T>:: \
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BOOST_PP_CAT( stride, which )( t ); \
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} \
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};\
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\
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template<> \
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struct get_dispatch< tag::bandwidth_type<which> > { \
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template< typename T > \
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static std::ptrdiff_t invoke( const T& t ) { \
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return detail::adaptor_access<T>:: \
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BOOST_PP_CAT( bandwidth, which )( t ); \
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} \
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};
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BOOST_PP_REPEAT_FROM_TO(1,3,GENERATE_GET,~)
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template< typename T, typename Key, typename Enable = void >
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struct get_impl {};
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template< typename T, typename Key >
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struct get_impl< T, Key, typename boost::enable_if<
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is_same_at< T, Key, std::ptrdiff_t > >::type > {
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typedef std::ptrdiff_t result_type;
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static std::ptrdiff_t invoke( const T& t ) {
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return get_dispatch<Key>::invoke( t );
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}
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};
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template< typename T, typename Key >
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struct get_impl< T, Key, typename boost::enable_if<
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mpl::not_< is_same_at< T, Key, std::ptrdiff_t > > >::type > {
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typedef typename property_at< T, Key >::type result_type;
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static result_type invoke( const T& ) {
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return result_type();
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}
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};
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template< typename T, typename Key >
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struct result_of_get {
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typedef typename get_impl< T, Key >::result_type type;
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};
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template< typename Key, typename T >
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typename result_of_get< T, Key >::type get( const T& t ) {
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return get_impl< T, Key >::invoke( t );
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}
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} // namespace detail
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} // namespace bindings
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} // namespace numeric
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} // namespace boost
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#endif
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