39 lines
1.1 KiB
C++
39 lines
1.1 KiB
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/equal.hpp>
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#include <boost/hana/find_if.hpp>
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#include <boost/hana/optional.hpp>
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#include <laws/base.hpp>
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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int main() {
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ct_eq<2> x{};
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ct_eq<3> y{};
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::find_if(hana::just(x), hana::equal.to(x)),
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hana::just(x)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::find_if(hana::just(x), hana::equal.to(y)),
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hana::nothing
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::find_if(hana::nothing, hana::equal.to(x)),
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hana::nothing
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));
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// Previously, there was a bug that would make this fail.
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auto non_const_nothing = hana::nothing;
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::find_if(non_const_nothing, hana::equal.to(x)),
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hana::nothing
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));
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}
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