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- // Copyright (C) 2016-2018 T. Zachary Laine
- //
- // 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)
- #include <boost/yap/expression.hpp>
- template<typename T>
- using term = boost::yap::terminal<boost::yap::expression, T>;
- template<long long I>
- using place_term =
- boost::yap::terminal<boost::yap::expression, boost::yap::placeholder<I>>;
- template<typename T>
- using ref = boost::yap::expression_ref<boost::yap::expression, T>;
- namespace yap = boost::yap;
- namespace bh = boost::hana;
- void compile_placeholders()
- {
- using namespace boost::yap::literals;
- {
- place_term<1> p1 = 1_p;
- (void)p1;
- }
- {
- place_term<1> p1 = 1_p;
- term<double> unity{1.0};
- yap::expression<
- yap::expr_kind::plus,
- bh::tuple<ref<place_term<1> &>, ref<term<double> &>>>
- expr = p1 + unity;
- (void)expr;
- }
- {
- place_term<1> p1 = 1_p;
- yap::expression<
- yap::expr_kind::plus,
- bh::tuple<ref<place_term<1> &>, place_term<2>>>
- expr = p1 + 2_p;
- (void)expr;
- }
- }
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