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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> class tuple;
// tuple& operator=(const tuple& u);
// UNSUPPORTED: c++03
#include <tuple>
#include <memory>
#include <string>
#include <cassert>
#include "test_macros.h"
struct NonAssignable {
NonAssignable& operator=(NonAssignable const&) = delete;
NonAssignable& operator=(NonAssignable&&) = delete;
};
struct CopyAssignable {
CopyAssignable& operator=(CopyAssignable const&) = default;
CopyAssignable& operator=(CopyAssignable &&) = delete;
};
static_assert(std::is_copy_assignable<CopyAssignable>::value, "");
struct MoveAssignable {
MoveAssignable& operator=(MoveAssignable const&) = delete;
MoveAssignable& operator=(MoveAssignable&&) = default;
};
struct NothrowCopyAssignable {
NothrowCopyAssignable& operator=(NothrowCopyAssignable const&) noexcept { return *this; }
};
struct PotentiallyThrowingCopyAssignable {
PotentiallyThrowingCopyAssignable& operator=(PotentiallyThrowingCopyAssignable const&) { return *this; }
};
struct CopyAssignableInt {
CopyAssignableInt& operator=(int&) { return *this; }
};
TEST_CONSTEXPR_CXX20
bool test()
{
{
typedef std::tuple<> T;
T t0;
T t;
t = t0;
}
{
typedef std::tuple<int> T;
T t0(2);
T t;
t = t0;
assert(std::get<0>(t) == 2);
}
{
typedef std::tuple<int, char> T;
T t0(2, 'a');
T t;
t = t0;
assert(std::get<0>(t) == 2);
assert(std::get<1>(t) == 'a');
}
{
// test reference assignment.
using T = std::tuple<int&, int&&>;
int x = 42;
int y = 100;
int x2 = -1;
int y2 = 500;
T t(x, std::move(y));
T t2(x2, std::move(y2));
t = t2;
assert(std::get<0>(t) == x2);
assert(&std::get<0>(t) == &x);
assert(std::get<1>(t) == y2);
assert(&std::get<1>(t) == &y);
}
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
{
// cannot be constexpr because of std::string
typedef std::tuple<int, char, std::string> T;
const T t0(2, 'a', "some text");
T t;
t = t0;
assert(std::get<0>(t) == 2);
assert(std::get<1>(t) == 'a');
assert(std::get<2>(t) == "some text");
}
{
// test that the implicitly generated copy assignment operator
// is properly deleted
using T = std::tuple<std::unique_ptr<int>>;
static_assert(!std::is_copy_assignable<T>::value, "");
}
{
using T = std::tuple<int, NonAssignable>;
static_assert(!std::is_copy_assignable<T>::value, "");
}
{
using T = std::tuple<int, CopyAssignable>;
static_assert(std::is_copy_assignable<T>::value, "");
}
{
using T = std::tuple<int, MoveAssignable>;
static_assert(!std::is_copy_assignable<T>::value, "");
}
{
using T = std::tuple<int, int, int>;
using P = std::pair<int, int>;
static_assert(!std::is_assignable<T&, P>::value, "");
}
{
// test const requirement
using T = std::tuple<CopyAssignableInt, CopyAssignableInt>;
using P = std::pair<int, int>;
static_assert(!std::is_assignable<T&, P const>::value, "");
}
{
using T = std::tuple<int, MoveAssignable>;
using P = std::pair<int, MoveAssignable>;
static_assert(!std::is_assignable<T&, P&>::value, "");
}
{
using T = std::tuple<NothrowCopyAssignable, int>;
static_assert(std::is_nothrow_copy_assignable<T>::value, "");
}
{
using T = std::tuple<PotentiallyThrowingCopyAssignable, int>;
static_assert(std::is_copy_assignable<T>::value, "");
static_assert(!std::is_nothrow_copy_assignable<T>::value, "");
}
return 0;
}
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