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// Copyright Louis Dionne 2013-2017
// 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/first.hpp>
#include <boost/hana/pair.hpp>
#include <boost/hana/second.hpp>
namespace hana = boost::hana;
struct MoveOnly {
int data_;
MoveOnly(MoveOnly const&) = delete;
MoveOnly& operator=(MoveOnly const&) = delete;
MoveOnly(int data) : data_(data) { }
MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
MoveOnly& operator=(MoveOnly&& x)
{ data_ = x.data_; x.data_ = 0; return *this; }
bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
};
class FromInt {
int data_;
public:
constexpr FromInt(int data) : data_(data) { }
constexpr bool operator==(const FromInt& x) const { return data_ == x.data_; }
};
int main() {
//////////////////////////////////////////////////////////////////////////
// Check for the pair(T&&, U&&) constructor
//////////////////////////////////////////////////////////////////////////
{
hana::pair<MoveOnly, short*> p(MoveOnly{3}, nullptr);
BOOST_HANA_RUNTIME_CHECK(hana::first(p) == MoveOnly{3});
BOOST_HANA_RUNTIME_CHECK(hana::second(p) == nullptr);
}
//////////////////////////////////////////////////////////////////////////
// Check for the pair(First const&, Second const&) constructor
//////////////////////////////////////////////////////////////////////////
{
hana::pair<float, short*> p1(3.5f, 0);
BOOST_HANA_RUNTIME_CHECK(hana::first(p1) == 3.5f);
BOOST_HANA_RUNTIME_CHECK(hana::second(p1) == nullptr);
// brace init
hana::pair<float, short*> p2 = {3.5f, 0};
BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == 3.5f);
BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == nullptr);
}
{
hana::pair<FromInt, int> p1(1, 2);
BOOST_HANA_RUNTIME_CHECK(hana::first(p1) == FromInt(1));
BOOST_HANA_RUNTIME_CHECK(hana::second(p1) == 2);
// brace init
hana::pair<FromInt, int> p2 = {1, 2};
BOOST_HANA_RUNTIME_CHECK(hana::first(p2) == FromInt(1));
BOOST_HANA_RUNTIME_CHECK(hana::second(p2) == 2);
}
// Make sure the above works constexpr too
{
constexpr hana::pair<float, short*> p1(3.5f, 0);
static_assert(hana::first(p1) == 3.5f, "");
static_assert(hana::second(p1) == nullptr, "");
// brace init
constexpr hana::pair<float, short*> p2 = {3.5f, 0};
static_assert(hana::first(p2) == 3.5f, "");
static_assert(hana::second(p2) == nullptr, "");
}
{
constexpr hana::pair<FromInt, int> p1(1, 2);
static_assert(hana::first(p1) == FromInt(1), "");
static_assert(hana::second(p1) == 2, "");
// brace init
constexpr hana::pair<FromInt, int> p2 = {1, 2};
static_assert(hana::first(p2) == FromInt(1), "");
static_assert(hana::second(p2) == 2, "");
}
}
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