You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
1.2 KiB
54 lines
1.2 KiB
6 years ago
|
//
|
||
|
|
// Copyright (c) 2009 Rutger ter Borg
|
||
|
|
//
|
||
|
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
|
// (See accompanying file LICENSE_1_0.txt or copy at
|
||
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
//
|
||
|
|
|
||
|
|
#ifndef BOOST_NUMERIC_BINDINGS_DETAIL_IF_LEFT_HPP
|
||
|
|
#define BOOST_NUMERIC_BINDINGS_DETAIL_IF_LEFT_HPP
|
||
|
|
|
||
|
|
#include <boost/numeric/bindings/tag.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace numeric {
|
||
|
|
namespace bindings {
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
template< typename Side, typename Left, typename Right >
|
||
|
|
struct if_left_impl {
|
||
|
|
|
||
|
|
typedef Right result_type;
|
||
|
|
|
||
|
|
static result_type invoke( Left, Right right ) {
|
||
|
|
return right;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
template< typename Left, typename Right >
|
||
|
|
struct if_left_impl< tag::left, Left, Right > {
|
||
|
|
|
||
|
|
typedef Left result_type;
|
||
|
|
|
||
|
|
static result_type invoke( Left left, Right ) {
|
||
|
|
return left;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
// by-value
|
||
|
|
template< typename Side, typename Left, typename Right >
|
||
|
|
typename if_left_impl< Side, const Left, const Right >::result_type
|
||
|
|
if_left( const Side, const Left left, const Right right ) {
|
||
|
|
return if_left_impl< Side, const Left, const Right >::invoke( left, right );
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
} // namespace bindings
|
||
|
|
} // namespace numeric
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif
|