21 lines
711 B
C++
21 lines
711 B
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/core/make.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/optional.hpp>
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namespace hana = boost::hana;
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int main() {
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constexpr auto x = hana::make<hana::optional_tag>();
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BOOST_HANA_CONSTANT_CHECK(x == hana::make_optional());
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BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(x));
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constexpr auto just_x = hana::make<hana::optional_tag>('x');
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static_assert(just_x == hana::make_optional('x'), "");
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BOOST_HANA_CONSTANT_CHECK(hana::is_just(just_x));
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}
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