forked from OSchip/llvm-project
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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;
|
|
}
|