left.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}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr))),
ref<term<double> &> &&>));
}
{
plus_expr_type plus_expr = unity + term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
ref<term<double> &> &>));
}
{
plus_expr_type const plus_expr = unity + term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
ref<term<double> &> const &>));
}
{
term<double> const unity = {{1.0}};
using plus_expr_type = yap::expression<
yap::expr_kind::plus,
bh::tuple<ref<term<double> const &>, term<int>>>;
{
plus_expr_type plus_expr = unity + term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr))),
ref<term<double> const &> &&>));
}
{
plus_expr_type plus_expr = unity + term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
ref<term<double> const &> &>));
}
{
plus_expr_type const plus_expr = unity + term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
ref<term<double> const &> const &>));
}
}
{
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}};
using plus_plus_expr_type = yap::expression<
yap::expr_kind::plus,
bh::tuple<ref<plus_expr_type &>, term<int>>>;
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr_ref))),
ref<term<double> &> &>));
}
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
ref<term<double> &> &>));
}
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type &> const plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
ref<term<double> &> &>));
}
}
{
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 const plus_expr = unity + term<int>{{1}};
using plus_plus_expr_type = yap::expression<
yap::expr_kind::plus,
bh::tuple<ref<plus_expr_type const &>, term<int>>>;
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type const &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr_ref))),
ref<term<double> &> const &>));
}
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type const &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
ref<term<double> &> const &>));
}
{
plus_plus_expr_type plus_plus_expr = plus_expr + term<int>{{1}};
ref<plus_expr_type const &> const plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
ref<term<double> &> const &>));
}
}
}
{
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}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr))),
user_ref<user_term<double> &> &&>));
}
{
plus_expr_type plus_expr = unity + user_term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
user_ref<user_term<double> &> &>));
}
{
plus_expr_type const plus_expr = unity + user_term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
user_ref<user_term<double> &> const &>));
}
{
user_term<double> const unity = {{1.0}};
using plus_expr_type = user_expr<
yap::expr_kind::plus,
bh::tuple<user_ref<user_term<double> const &>, user_term<int>>>;
{
plus_expr_type plus_expr = unity + user_term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr))),
user_ref<user_term<double> const &> &&>));
}
{
plus_expr_type plus_expr = unity + user_term<int>{{1}};
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr)),
user_ref<user_term<double> const &> &>));
}
{
plus_expr_type const plus_expr = unity + user_term<int>{{1}};
BOOST_MPL_ASSERT(
(std::is_same<
decltype(yap::left(plus_expr)),
user_ref<user_term<double> const &> const &>));
}
}
{
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}};
using plus_plus_expr_type = user_expr<
yap::expr_kind::plus,
bh::tuple<user_ref<plus_expr_type &>, user_term<int>>>;
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr_ref))),
user_ref<user_term<double> &> &>));
}
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
user_ref<user_term<double> &> &>));
}
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type &> const plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
user_ref<user_term<double> &> &>));
}
}
{
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 const plus_expr = unity + user_term<int>{{1}};
using plus_plus_expr_type = user_expr<
yap::expr_kind::plus,
bh::tuple<user_ref<plus_expr_type const &>, user_term<int>>>;
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type const &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(std::move(plus_expr_ref))),
user_ref<user_term<double> &> const &>));
}
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type const &> plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
user_ref<user_term<double> &> const &>));
}
{
plus_plus_expr_type plus_plus_expr =
plus_expr + user_term<int>{{1}};
user_ref<plus_expr_type const &> const plus_expr_ref =
bh::front(plus_plus_expr.elements);
BOOST_MPL_ASSERT((std::is_same<
decltype(yap::left(plus_expr_ref)),
user_ref<user_term<double> &> const &>));
}
}
}
#ifndef _MSC_VER // Tsk, tsk.
{
using term_t = term<int>;
constexpr auto expr = term_t{13} + term_t{42};
constexpr auto result1 = expr.left().value();
constexpr auto result2 = yap::value(left(expr));
(void)result1;
(void)result2;
}
#endif
return boost::report_errors();
}