mirror of https://gitee.com/bigwinds/arangodb
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Copyright Louis Dionne 2013-2016
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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/first.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/second.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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int main() {
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{
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typedef std::pair<int, short> P1;
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hana::pair<int, short> p1(3, 4);
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hana::pair<int, short> p2 = p1;
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3);
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
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}
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static_assert(std::is_trivially_copy_constructible<hana::pair<int, int>>::value, "");
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// make sure it also works constexpr
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{
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constexpr hana::pair<int, short> p1(3, 4);
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constexpr hana::pair<int, short> p2 = p1;
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static_assert(hana::first(p2) == 3, "");
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static_assert(hana::second(p2) == 4, "");
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}
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// Make sure it works across pair types (pair<T, U> -> pair<U, V>)
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{
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hana::pair<int, short> p1(3, 4);
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hana::pair<double, long> p2 = p1;
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3);
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 4);
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}
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// And also constexpr across pair types
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{
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constexpr hana::pair<int, short> p1(3, 4);
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constexpr hana::pair<double, long> p2 = p1;
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static_assert(hana::first(p2) == 3, "");
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static_assert(hana::second(p2) == 4, "");
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}
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}
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