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53 lines
1.2 KiB
53 lines
1.2 KiB
// |
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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_IF_LEFT_HPP |
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#define BOOST_NUMERIC_BINDINGS_DETAIL_IF_LEFT_HPP |
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#include <boost/numeric/bindings/tag.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 Side, typename Left, typename Right > |
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struct if_left_impl { |
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typedef Right result_type; |
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static result_type invoke( Left, Right right ) { |
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return right; |
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} |
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}; |
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template< typename Left, typename Right > |
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struct if_left_impl< tag::left, Left, Right > { |
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typedef Left result_type; |
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static result_type invoke( Left left, Right ) { |
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return left; |
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} |
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}; |
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// by-value |
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template< typename Side, typename Left, typename Right > |
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typename if_left_impl< Side, const Left, const Right >::result_type |
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if_left( const Side, const Left left, const Right right ) { |
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return if_left_impl< Side, const Left, const Right >::invoke( left, right ); |
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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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