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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// XFAIL: !has-64-bit-atomics
// integral-type operator++(int) const noexcept;
// integral-type operator--(int) const noexcept;
// integral-type operator++() const noexcept;
// integral-type operator--() const noexcept;
#include <atomic>
#include <cassert>
#include <concepts>
#include <type_traits>
#include <utility>
#include "atomic_helpers.h"
#include "test_macros.h"
template <typename T>
concept has_pre_increment_operator = requires { ++std::declval<T const>(); };
template <typename T>
concept has_post_increment_operator = requires { std::declval<T const>()++; };
template <typename T>
concept has_pre_decrement_operator = requires { --std::declval<T const>(); };
template <typename T>
concept has_post_decrement_operator = requires { std::declval<T const>()--; };
template <typename T>
constexpr bool does_not_have_increment_nor_decrement_operators() {
return !has_pre_increment_operator<T> && !has_pre_decrement_operator<T> && !has_post_increment_operator<T> &&
!has_post_decrement_operator<T>;
}
template <typename T>
struct TestDoesNotHaveIncrementDecrement {
void operator()() const { static_assert(does_not_have_increment_nor_decrement_operators<std::atomic_ref<T>>()); }
};
template <typename T>
struct TestIncrementDecrement {
void operator()() const {
if constexpr (std::is_integral_v<T>) {
T x(T(1));
std::atomic_ref<T> const a(x);
{
std::same_as<T> decltype(auto) y = ++a;
assert(y == T(2));
assert(x == T(2));
ASSERT_NOEXCEPT(++a);
}
{
std::same_as<T> decltype(auto) y = --a;
assert(y == T(1));
assert(x == T(1));
ASSERT_NOEXCEPT(--a);
}
{
std::same_as<T> decltype(auto) y = a++;
assert(y == T(1));
assert(x == T(2));
ASSERT_NOEXCEPT(a++);
}
{
std::same_as<T> decltype(auto) y = a--;
assert(y == T(2));
assert(x == T(1));
ASSERT_NOEXCEPT(a--);
}
} else if constexpr (std::is_pointer_v<T>) {
using U = std::remove_pointer_t<T>;
U t[9] = {};
T p{&t[1]};
std::atomic_ref<T> const a(p);
{
std::same_as<T> decltype(auto) y = ++a;
assert(y == &t[2]);
assert(p == &t[2]);
ASSERT_NOEXCEPT(++a);
}
{
std::same_as<T> decltype(auto) y = --a;
assert(y == &t[1]);
assert(p == &t[1]);
ASSERT_NOEXCEPT(--a);
}
{
std::same_as<T> decltype(auto) y = a++;
assert(y == &t[1]);
assert(p == &t[2]);
ASSERT_NOEXCEPT(a++);
}
{
std::same_as<T> decltype(auto) y = a--;
assert(y == &t[2]);
assert(p == &t[1]);
ASSERT_NOEXCEPT(a--);
}
} else {
static_assert(std::is_void_v<T>);
}
}
};
int main(int, char**) {
TestEachIntegralType<TestIncrementDecrement>()();
TestEachFloatingPointType<TestDoesNotHaveIncrementDecrement>()();
TestEachPointerType<TestIncrementDecrement>()();
TestDoesNotHaveIncrementDecrement<bool>()();
TestDoesNotHaveIncrementDecrement<UserAtomicType>()();
TestDoesNotHaveIncrementDecrement<LargeUserAtomicType>()();
return 0;
}
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