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72 lines
1.7 KiB
72 lines
1.7 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_AT_HPP
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#define BOOST_NUMERIC_BINDINGS_AT_HPP
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#include <boost/numeric/bindings/detail/offset.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, typename Enable = void >
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struct at_impl {
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typedef typename bindings::value_type<T>::type& result_type;
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// TODO implement other array structures such as triangular, band, etc.
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static result_type invoke( T& t, const std::ptrdiff_t i1, std::ptrdiff_t i2 ) {
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return t( i1, i2 );
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}
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};
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template< typename T >
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struct at_impl< T, typename boost::enable_if< bindings::has_linear_array<T> >::type > {
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typedef typename bindings::value_type<T>::type& result_type;
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static result_type invoke( T& t, const std::ptrdiff_t i1 ) {
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return *( bindings::begin_value(t) + offset(t,i1) );
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}
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static result_type invoke( T& t, const std::ptrdiff_t i1, std::ptrdiff_t i2 ) {
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return *( bindings::begin_value(t) + offset(t,i1,i2) );
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}
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};
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}
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namespace result_of {
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template< typename T >
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struct at {
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typedef typename detail::at_impl<T>::result_type type;
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};
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}
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template< typename T >
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typename result_of::at<T>::type at( T& t, const std::ptrdiff_t i1 ) {
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return detail::at_impl<T>::invoke( t, i1 );
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}
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template< typename T >
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typename result_of::at<T>::type at( T& t, const std::ptrdiff_t i1, const std::ptrdiff_t i2 ) {
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return detail::at_impl<T>::invoke( t, i1, i2 );
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}
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} // bindings
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} // numeric
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} // boost
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#endif
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