deref.cpp
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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>
#include <boost/mpl/assert.hpp>
#include <boost/core/lightweight_test.hpp>
template<typename T>
using term = boost::yap::terminal<boost::yap::expression, T>;
template<typename T>
using ref = boost::yap::expression_ref<boost::yap::expression, T>;
namespace yap = boost::yap;
namespace bh = boost::hana;
template<boost::yap::expr_kind Kind, typename Tuple>
struct user_expr
{
static boost::yap::expr_kind const kind = Kind;
Tuple elements;
};
BOOST_YAP_USER_BINARY_OPERATOR(plus, user_expr, user_expr)
template<typename T>
using user_term = boost::yap::terminal<user_expr, T>;
template<typename T>
using user_ref = boost::yap::expression_ref<user_expr, T>;
int main()
{
{
term<double> unity = {{1.0}};
using plus_expr_type = yap::expression<
yap::expr_kind::plus,
bh::tuple<ref<term<double> &>, term<int>>>;
plus_expr_type plus_expr = unity + term<int>{{1}};
{
ref<term<double> &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(std::move(ref))),
term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
ref<term<double> &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT(
(std::is_same<decltype(yap::deref(ref)), term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
ref<term<double> &> const ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT(
(std::is_same<decltype(yap::deref(ref)), term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
term<double> const unity = {{1.0}};
yap::expression<
yap::expr_kind::plus,
bh::tuple<ref<term<double> const &>, term<int>>>
plus_expr = unity + term<int>{{1}};
{
ref<term<double> const &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(std::move(ref))),
term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
ref<term<double> const &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(ref)),
term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
ref<term<double> const &> const ref =
bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(ref)),
term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
}
}
{
user_term<double> unity = {{1.0}};
using plus_expr_type = user_expr<
yap::expr_kind::plus,
bh::tuple<user_ref<user_term<double> &>, user_term<int>>>;
plus_expr_type plus_expr = unity + user_term<int>{{1}};
{
user_ref<user_term<double> &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(std::move(ref))),
user_term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
user_ref<user_term<double> &> ref = bh::front(plus_expr.elements);
BOOST_MPL_ASSERT(
(std::is_same<decltype(yap::deref(ref)), user_term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
user_ref<user_term<double> &> const ref =
bh::front(plus_expr.elements);
BOOST_MPL_ASSERT(
(std::is_same<decltype(yap::deref(ref)), user_term<double> &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
user_term<double> const unity = {{1.0}};
user_expr<
yap::expr_kind::plus,
bh::tuple<user_ref<user_term<double> const &>, user_term<int>>>
plus_expr = unity + user_term<int>{{1}};
{
user_ref<user_term<double> const &> ref =
bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(std::move(ref))),
user_term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
user_ref<user_term<double> const &> ref =
bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(ref)),
user_term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
{
user_ref<user_term<double> const &> const ref =
bh::front(plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::deref(ref)),
user_term<double> const &>));
BOOST_TEST(yap::value(ref) == 1.0);
}
}
}
return boost::report_errors();
}