19557a4c8f
The implementation is fine and has the proper increment/decrement operators defined, but the tests were wrong: - a typo (`T` instead of `std::atomic_ref<T>`) when ensuring that increment/decrement operators are not defined in the primary template and specialization for floating point types, and - the specialization for pointer types was miscategorized.
134 lines
3.5 KiB
C++
134 lines
3.5 KiB
C++
//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// XFAIL: !has-64-bit-atomics
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// integral-type operator++(int) const noexcept;
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// integral-type operator--(int) const noexcept;
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// integral-type operator++() const noexcept;
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// integral-type operator--() const noexcept;
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#include <atomic>
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#include <cassert>
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#include <concepts>
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#include <type_traits>
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#include <utility>
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#include "atomic_helpers.h"
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#include "test_macros.h"
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template <typename T>
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concept has_pre_increment_operator = requires { ++std::declval<T const>(); };
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template <typename T>
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concept has_post_increment_operator = requires { std::declval<T const>()++; };
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template <typename T>
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concept has_pre_decrement_operator = requires { --std::declval<T const>(); };
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template <typename T>
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concept has_post_decrement_operator = requires { std::declval<T const>()--; };
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template <typename T>
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constexpr bool does_not_have_increment_nor_decrement_operators() {
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return !has_pre_increment_operator<T> && !has_pre_decrement_operator<T> && !has_post_increment_operator<T> &&
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!has_post_decrement_operator<T>;
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}
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template <typename T>
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struct TestDoesNotHaveIncrementDecrement {
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void operator()() const { static_assert(does_not_have_increment_nor_decrement_operators<std::atomic_ref<T>>()); }
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};
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template <typename T>
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struct TestIncrementDecrement {
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void operator()() const {
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if constexpr (std::is_integral_v<T>) {
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T x(T(1));
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std::atomic_ref<T> const a(x);
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{
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std::same_as<T> decltype(auto) y = ++a;
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assert(y == T(2));
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assert(x == T(2));
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ASSERT_NOEXCEPT(++a);
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}
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{
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std::same_as<T> decltype(auto) y = --a;
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assert(y == T(1));
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assert(x == T(1));
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ASSERT_NOEXCEPT(--a);
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}
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{
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std::same_as<T> decltype(auto) y = a++;
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assert(y == T(1));
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assert(x == T(2));
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ASSERT_NOEXCEPT(a++);
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}
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{
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std::same_as<T> decltype(auto) y = a--;
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assert(y == T(2));
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assert(x == T(1));
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ASSERT_NOEXCEPT(a--);
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}
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} else if constexpr (std::is_pointer_v<T>) {
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using U = std::remove_pointer_t<T>;
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U t[9] = {};
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T p{&t[1]};
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std::atomic_ref<T> const a(p);
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{
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std::same_as<T> decltype(auto) y = ++a;
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assert(y == &t[2]);
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assert(p == &t[2]);
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ASSERT_NOEXCEPT(++a);
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}
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{
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std::same_as<T> decltype(auto) y = --a;
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assert(y == &t[1]);
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assert(p == &t[1]);
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ASSERT_NOEXCEPT(--a);
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}
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{
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std::same_as<T> decltype(auto) y = a++;
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assert(y == &t[1]);
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assert(p == &t[2]);
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ASSERT_NOEXCEPT(a++);
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}
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{
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std::same_as<T> decltype(auto) y = a--;
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assert(y == &t[2]);
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assert(p == &t[1]);
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ASSERT_NOEXCEPT(a--);
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}
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} else {
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static_assert(std::is_void_v<T>);
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}
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}
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};
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int main(int, char**) {
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TestEachIntegralType<TestIncrementDecrement>()();
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TestEachFloatingPointType<TestDoesNotHaveIncrementDecrement>()();
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TestEachPointerType<TestIncrementDecrement>()();
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TestDoesNotHaveIncrementDecrement<bool>()();
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TestDoesNotHaveIncrementDecrement<UserAtomicType>()();
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TestDoesNotHaveIncrementDecrement<LargeUserAtomicType>()();
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return 0;
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}
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