88 lines
3.0 KiB
C++
88 lines
3.0 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/first.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/second.hpp>
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namespace hana = boost::hana;
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struct MoveOnly {
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int data_;
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MoveOnly(MoveOnly const&) = delete;
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MoveOnly& operator=(MoveOnly const&) = delete;
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MoveOnly(int data) : data_(data) { }
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MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
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MoveOnly& operator=(MoveOnly&& x)
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{ data_ = x.data_; x.data_ = 0; return *this; }
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bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
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};
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class FromInt {
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int data_;
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public:
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constexpr FromInt(int data) : data_(data) { }
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constexpr bool operator==(const FromInt& x) const { return data_ == x.data_; }
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};
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int main() {
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//////////////////////////////////////////////////////////////////////////
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// Check for the pair(T&&, U&&) constructor
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//////////////////////////////////////////////////////////////////////////
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{
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hana::pair<MoveOnly, short*> p(MoveOnly{3}, nullptr);
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BOOST_HANA_RUNTIME_CHECK(hana::first(p) == MoveOnly{3});
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BOOST_HANA_RUNTIME_CHECK(hana::second(p) == nullptr);
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}
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//////////////////////////////////////////////////////////////////////////
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// Check for the pair(First const&, Second const&) constructor
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//////////////////////////////////////////////////////////////////////////
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{
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hana::pair<float, short*> p1(3.5f, 0);
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BOOST_HANA_RUNTIME_CHECK(hana::first(p1) == 3.5f);
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BOOST_HANA_RUNTIME_CHECK(hana::second(p1) == nullptr);
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// brace init
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hana::pair<float, short*> p2 = {3.5f, 0};
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3.5f);
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == nullptr);
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}
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{
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hana::pair<FromInt, int> p1(1, 2);
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BOOST_HANA_RUNTIME_CHECK(hana::first(p1) == FromInt(1));
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BOOST_HANA_RUNTIME_CHECK(hana::second(p1) == 2);
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// brace init
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hana::pair<FromInt, int> p2 = {1, 2};
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BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == FromInt(1));
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BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 2);
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}
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// Make sure the above works constexpr too
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{
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constexpr hana::pair<float, short*> p1(3.5f, 0);
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static_assert(hana::first(p1) == 3.5f, "");
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static_assert(hana::second(p1) == nullptr, "");
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// brace init
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constexpr hana::pair<float, short*> p2 = {3.5f, 0};
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static_assert(hana::first(p2) == 3.5f, "");
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static_assert(hana::second(p2) == nullptr, "");
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}
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{
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constexpr hana::pair<FromInt, int> p1(1, 2);
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static_assert(hana::first(p1) == FromInt(1), "");
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static_assert(hana::second(p1) == 2, "");
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// brace init
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constexpr hana::pair<FromInt, int> p2 = {1, 2};
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static_assert(hana::first(p2) == FromInt(1), "");
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static_assert(hana::second(p2) == 2, "");
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}
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}
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