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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types>
// template <class... UTypes>
// constexpr explicit(see below) tuple<Types>::tuple(const
// tuple<UTypes...>&&);
//
// Constraints:
// sizeof...(Types) equals sizeof...(UTypes) &&
// (is_constructible_v<Types, decltype(get<I>(FWD(u)))> && ...) is true &&
// (
// sizeof...(Types) is not 1 ||
// (
// !is_convertible_v<decltype(u), T> &&
// !is_constructible_v<T, decltype(u)> &&
// !is_same_v<T, U>
// )
// )
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
#include <cassert>
#include <tuple>
#include "copy_move_types.h"
#include "test_macros.h"
// test: The expression inside explicit is equivalent to:
// !(is_convertible_v<decltype(get<I>(FWD(u))), Types> && ...)
static_assert(std::is_convertible_v<const std::tuple<ConstMove>&&, std::tuple<ConvertibleFrom<ConstMove>>>);
static_assert(std::is_convertible_v<const std::tuple<ConstMove, ConstMove>&&,
std::tuple<ConvertibleFrom<ConstMove>, ConvertibleFrom<ConstMove>>>);
static_assert(
!std::is_convertible_v<const std::tuple<MutableCopy>&&, std::tuple<ExplicitConstructibleFrom<ConstMove>>>);
static_assert(!std::is_convertible_v<const std::tuple<ConstMove, ConstMove>&&,
std::tuple<ConvertibleFrom<ConstMove>, ExplicitConstructibleFrom<ConstMove>>>);
constexpr bool test() {
// test implicit conversions.
// sizeof...(Types) == 1
{
const std::tuple<ConstMove> t1{1};
std::tuple<ConvertibleFrom<ConstMove>> t2 = std::move(t1);
assert(std::get<0>(t2).v.val == 1);
}
// test implicit conversions.
// sizeof...(Types) > 1
{
const std::tuple<ConstMove, int> t1{1, 2};
std::tuple<ConvertibleFrom<ConstMove>, int> t2 = std::move(t1);
assert(std::get<0>(t2).v.val == 1);
assert(std::get<1>(t2) == 2);
}
// test explicit conversions.
// sizeof...(Types) == 1
{
const std::tuple<ConstMove> t1{1};
std::tuple<ExplicitConstructibleFrom<ConstMove>> t2{std::move(t1)};
assert(std::get<0>(t2).v.val == 1);
}
// test explicit conversions.
// sizeof...(Types) > 1
{
const std::tuple<ConstMove, int> t1{1, 2};
std::tuple<ExplicitConstructibleFrom<ConstMove>, int> t2{std::move(t1)};
assert(std::get<0>(t2).v.val == 1);
assert(std::get<1>(t2) == 2);
}
// test constraints
// sizeof...(Types) != sizeof...(UTypes)
static_assert(!std::is_constructible_v<std::tuple<int, int>, const std::tuple<int>&&>);
static_assert(!std::is_constructible_v<std::tuple<int, int, int>, const std::tuple<int, int>&&>);
// !(is_constructible_v<Types, decltype(get<I>(FWD(u)))> && ...)
static_assert(!std::is_constructible_v<std::tuple<int, NoConstructorFromInt>, const std::tuple<int, int>&&>);
// sizeof...(Types) == 1 && other branch of "||" satisfied
{
const std::tuple<TracedCopyMove> t1{};
std::tuple<ConvertibleFrom<TracedCopyMove>> t2{std::move(t1)};
assert(constMoveCtrCalled(std::get<0>(t2).v));
}
// sizeof...(Types) == 1 && is_same_v<T, U>
{
const std::tuple<TracedCopyMove> t1{};
std::tuple<TracedCopyMove> t2{t1};
assert(!constMoveCtrCalled(std::get<0>(t2)));
}
// sizeof...(Types) != 1
{
const std::tuple<TracedCopyMove, TracedCopyMove> t1{};
std::tuple<TracedCopyMove, TracedCopyMove> t2{std::move(t1)};
assert(constMoveCtrCalled(std::get<0>(t2)));
}
// These two test points cause gcc to ICE
#if !defined(TEST_COMPILER_GCC)
// sizeof...(Types) == 1 && is_convertible_v<decltype(u), T>
{
const std::tuple<CvtFromConstTupleRefRef> t1{};
std::tuple<ConvertibleFrom<CvtFromConstTupleRefRef>> t2{std::move(t1)};
assert(!constMoveCtrCalled(std::get<0>(t2).v));
}
// sizeof...(Types) == 1 && is_constructible_v<decltype(u), T>
{
const std::tuple<ExplicitCtrFromConstTupleRefRef> t1{};
std::tuple<ConvertibleFrom<ExplicitCtrFromConstTupleRefRef>> t2{std::move(t1)};
assert(!constMoveCtrCalled(std::get<0>(t2).v));
}
#endif
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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