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97 lines
2.6 KiB
97 lines
2.6 KiB
6 years ago
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//
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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_COLUMN_HPP
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#define BOOST_NUMERIC_BINDINGS_COLUMN_HPP
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#include <boost/numeric/bindings/begin.hpp>
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#include <boost/numeric/bindings/end.hpp>
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#include <boost/numeric/bindings/detail/adaptable_type.hpp>
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#include <boost/numeric/bindings/detail/offset.hpp>
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#include <boost/numeric/bindings/size.hpp>
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#include <boost/numeric/bindings/stride.hpp>
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#include <boost/numeric/bindings/value_type.hpp>
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#include <boost/ref.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 T >
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struct column_wrapper:
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adaptable_type< column_wrapper<T> >,
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reference_wrapper<T> {
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column_wrapper( T& t, std::size_t index ):
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reference_wrapper<T>(t),
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m_index( index ) {}
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std::size_t m_index;
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};
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template< typename T, typename Id, typename Enable >
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struct adaptor< column_wrapper<T>, Id, Enable > {
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typedef typename bindings::value_type< T>::type value_type;
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typedef mpl::map<
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mpl::pair< tag::value_type, value_type >,
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mpl::pair< tag::entity, tag::vector >,
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mpl::pair< tag::size_type<1>, typename result_of::size1<T>::type >,
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mpl::pair< tag::data_structure, tag::linear_array >,
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mpl::pair< tag::stride_type<1>, typename result_of::stride1<T>::type >
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> property_map;
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static typename result_of::size1<T>::type size1( const Id& id ) {
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return bindings::size1( id.get() );
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}
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static typename result_of::begin_value< T >::type begin_value( Id& id ) {
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return bindings::begin_value( id.get() ) +
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offset( id.get(), 0, id.m_index );
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}
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static typename result_of::end_value< T >::type end_value( Id& id ) {
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return bindings::begin_value( id.get() ) +
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offset( id.get(), size1(id), id.m_index );
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}
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static typename result_of::stride1<T>::type stride1( const Id& id ) {
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return bindings::stride1( id.get() );
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}
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};
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} // namespace detail
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namespace result_of {
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template< typename T >
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struct column {
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typedef detail::column_wrapper<T> type;
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};
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}
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template< typename T >
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detail::column_wrapper<T> const column( T& underlying, std::size_t index ) {
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return detail::column_wrapper<T>( underlying, index );
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}
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template< typename T >
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detail::column_wrapper<const T> const column( const T& underlying, std::size_t index ) {
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return detail::column_wrapper<const T>( underlying, index );
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}
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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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