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arangodb/3rdParty/boost/1.62.0/libs/hana/test/optional/unpack.cpp

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// Copyright Louis Dionne 2013-2016
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#include <boost/hana/assert.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/optional.hpp>
#include <boost/hana/unpack.hpp>
#include <laws/base.hpp>
namespace hana = boost::hana;
int main() {
hana::test::ct_eq<2> x{};
hana::test::_injection<0> f{};
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::unpack(hana::nothing, f),
f()
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::unpack(hana::just(x), f),
f(x)
));
// Previously, there was a bug that would make this fail.
auto non_const_nothing = hana::nothing;
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::unpack(non_const_nothing, f),
f()
));
}