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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
// UNSUPPORTED: apple-clang-9, apple-clang-10, apple-clang-11, apple-clang-12.0.0
// <compare>
// class weak_ordering
#include <compare>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
const volatile void* volatile sink;
void test_static_members() {
DoNotOptimize(&std::weak_ordering::less);
DoNotOptimize(&std::weak_ordering::equivalent);
DoNotOptimize(&std::weak_ordering::greater);
}
void test_signatures() {
auto& Eq = std::weak_ordering::equivalent;
ASSERT_NOEXCEPT(Eq == 0);
ASSERT_NOEXCEPT(0 == Eq);
ASSERT_NOEXCEPT(Eq != 0);
ASSERT_NOEXCEPT(0 != Eq);
ASSERT_NOEXCEPT(0 < Eq);
ASSERT_NOEXCEPT(Eq < 0);
ASSERT_NOEXCEPT(0 <= Eq);
ASSERT_NOEXCEPT(Eq <= 0);
ASSERT_NOEXCEPT(0 > Eq);
ASSERT_NOEXCEPT(Eq > 0);
ASSERT_NOEXCEPT(0 >= Eq);
ASSERT_NOEXCEPT(Eq >= 0);
#ifndef TEST_HAS_NO_SPACESHIP_OPERATOR
ASSERT_NOEXCEPT(0 <=> Eq);
ASSERT_NOEXCEPT(Eq <=> 0);
ASSERT_SAME_TYPE(decltype(Eq <=> 0), std::weak_ordering);
ASSERT_SAME_TYPE(decltype(0 <=> Eq), std::weak_ordering);
#endif
}
constexpr bool test_conversion() {
static_assert(std::is_convertible<const std::weak_ordering&,
std::partial_ordering>::value, "");
{ // value == 0
auto V = std::weak_ordering::equivalent;
std::partial_ordering WV = V;
assert(WV == 0);
}
{ // value < 0
auto V = std::weak_ordering::less;
std::partial_ordering WV = V;
assert(WV < 0);
}
{ // value > 0
auto V = std::weak_ordering::greater;
std::partial_ordering WV = V;
assert(WV > 0);
}
return true;
}
constexpr void test_equality() {
#ifndef TEST_HAS_NO_SPACESHIP_OPERATOR
auto& WeakEq = std::weak_ordering::equivalent;
auto& PartialEq = std::partial_ordering::equivalent;
assert(WeakEq == PartialEq);
auto& StrongEq = std::strong_ordering::equal;
assert(WeakEq == StrongEq);
#endif
}
constexpr bool test_constexpr() {
auto& Eq = std::weak_ordering::equivalent;
auto& Less = std::weak_ordering::less;
auto& Greater = std::weak_ordering::greater;
struct {
std::weak_ordering Value;
bool ExpectEq;
bool ExpectNeq;
bool ExpectLess;
bool ExpectGreater;
} TestCases[] = {
{Eq, true, false, false, false},
{Less, false, true, true, false},
{Greater, false, true, false, true},
};
for (auto TC : TestCases) {
auto V = TC.Value;
assert((V == 0) == TC.ExpectEq);
assert((0 == V) == TC.ExpectEq);
assert((V != 0) == TC.ExpectNeq);
assert((0 != V) == TC.ExpectNeq);
assert((V < 0) == TC.ExpectLess);
assert((V > 0) == TC.ExpectGreater);
assert((V <= 0) == (TC.ExpectLess || TC.ExpectEq));
assert((V >= 0) == (TC.ExpectGreater || TC.ExpectEq));
assert((0 < V) == TC.ExpectGreater);
assert((0 > V) == TC.ExpectLess);
assert((0 <= V) == (TC.ExpectGreater || TC.ExpectEq));
assert((0 >= V) == (TC.ExpectLess || TC.ExpectEq));
}
#ifndef TEST_HAS_NO_SPACESHIP_OPERATOR
{
std::weak_ordering res = (Eq <=> 0);
((void)res);
res = (0 <=> Eq);
((void)res);
}
enum ExpectRes {
ER_Greater,
ER_Less,
ER_Equiv
};
struct {
std::weak_ordering Value;
ExpectRes Expect;
} SpaceshipTestCases[] = {
{std::weak_ordering::equivalent, ER_Equiv},
{std::weak_ordering::less, ER_Less},
{std::weak_ordering::greater, ER_Greater},
};
for (auto TC : SpaceshipTestCases)
{
std::weak_ordering Res = (TC.Value <=> 0);
switch (TC.Expect) {
case ER_Equiv:
assert(Res == 0);
assert(0 == Res);
break;
case ER_Less:
assert(Res < 0);
break;
case ER_Greater:
assert(Res > 0);
break;
}
}
{
static_assert(std::weak_ordering::less == std::weak_ordering::less);
static_assert(std::weak_ordering::less != std::weak_ordering::equivalent);
static_assert(std::weak_ordering::less != std::weak_ordering::greater);
static_assert(std::weak_ordering::equivalent != std::weak_ordering::less);
static_assert(std::weak_ordering::equivalent ==
std::weak_ordering::equivalent);
static_assert(std::weak_ordering::equivalent !=
std::weak_ordering::greater);
static_assert(std::weak_ordering::greater != std::weak_ordering::less);
static_assert(std::weak_ordering::greater !=
std::weak_ordering::equivalent);
static_assert(std::weak_ordering::greater == std::weak_ordering::greater);
}
test_equality();
#endif
return true;
}
int main(int, char**) {
test_static_members();
test_signatures();
test_equality();
static_assert(test_conversion(), "conversion test failed");
static_assert(test_constexpr(), "constexpr test failed");
return 0;
}
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