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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/tuple.hpp>
#include <type_traits>
#include <utility>
namespace hana = boost::hana;
struct MoveOnly {
int data_;
MoveOnly(MoveOnly const&) = delete;
MoveOnly& operator=(MoveOnly const&) = delete;
MoveOnly(int data = 1) : data_(data) { }
MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
MoveOnly& operator=(MoveOnly&& x)
{ data_ = x.data_; x.data_ = 0; return *this; }
int get() const {return data_;}
bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
bool operator< (const MoveOnly& x) const { return data_ < x.data_; }
};
int main() {
{
using T = hana::tuple<>;
T t0;
T t = std::move(t0); (void)t;
}
{
using T = hana::tuple<MoveOnly>;
T t0(MoveOnly(0));
T t = std::move(t0); (void)t;
BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
}
{
using T = hana::tuple<MoveOnly, MoveOnly>;
T t0(MoveOnly(0), MoveOnly(1));
T t = std::move(t0); (void)t;
BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
}
{
using T = hana::tuple<MoveOnly, MoveOnly, MoveOnly>;
T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
T t = std::move(t0); (void)t;
BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 2);
}
{
// Check for SFINAE-friendliness
static_assert(!std::is_constructible<
hana::tuple<MoveOnly>, MoveOnly const&
>{}, "");
static_assert(!std::is_constructible<
hana::tuple<MoveOnly>, MoveOnly&
>{}, "");
static_assert(std::is_constructible<
hana::tuple<MoveOnly>, MoveOnly
>{}, "");
static_assert(std::is_constructible<
hana::tuple<MoveOnly>, MoveOnly&&
>{}, "");
}
}
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