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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>
// constexpr const tuple& operator=(tuple&&) const;
//
// Constraints: (is_assignable_v<const Types&, Types> && ...) is true.
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// test constraints
#include <cassert>
#include <tuple>
#include <type_traits>
#include "test_macros.h"
#include "copy_move_types.h"
static_assert(!std::is_assignable_v<const std::tuple<int>&, std::tuple<int>&&>);
static_assert(std::is_assignable_v<const std::tuple<int&>&, std::tuple<int&>&&>);
static_assert(std::is_assignable_v<const std::tuple<int&, int&>&, std::tuple<int&, int&>&&>);
static_assert(!std::is_assignable_v<const std::tuple<int&, int>&, std::tuple<int&, int>&&>);
// this is fallback to tuple's const copy assignment
static_assert(std::is_assignable_v<const std::tuple<ConstCopyAssign>&, std::tuple<ConstCopyAssign>&&>);
static_assert(!std::is_assignable_v<const std::tuple<CopyAssign>&, std::tuple<CopyAssign>&&>);
static_assert(std::is_assignable_v<const std::tuple<ConstMoveAssign>&, std::tuple<ConstMoveAssign>&&>);
static_assert(!std::is_assignable_v<const std::tuple<MoveAssign>&, std::tuple<MoveAssign>&&>);
constexpr bool test() {
// reference types
{
int i1 = 1;
int i2 = 2;
double d1 = 3.0;
double d2 = 5.0;
std::tuple<int&, double&> t1{i1, d1};
const std::tuple<int&, double&> t2{i2, d2};
t2 = std::move(t1);
assert(std::get<0>(t2) == 1);
assert(std::get<1>(t2) == 3.0);
}
// user defined const move assignment
{
std::tuple<ConstMoveAssign> t1{1};
const std::tuple<ConstMoveAssign> t2{2};
t2 = std::move(t1);
assert(std::get<0>(t2).val == 1);
}
// make sure the right assignment operator of the type in the tuple is used
{
std::tuple<TracedAssignment, const TracedAssignment> t1{};
const std::tuple<TracedAssignment, const TracedAssignment> t2{};
t2 = std::move(t1);
assert(std::get<0>(t2).constMoveAssign == 1);
assert(std::get<1>(t2).constCopyAssign == 1);
}
return true;
}
int main(int, char**) {
test();
// gcc cannot have mutable member in constant expression
#if !defined(TEST_COMPILER_GCC)
static_assert(test());
#endif
return 0;
}
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