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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: libcpp-no-concepts
// <utility>
// template<class T, class U>
// constexpr bool cmp_less(T t, U u) noexcept; // C++20
#include <utility>
#include <limits>
#include <numeric>
#include <tuple>
#include <cassert>
#include "test_macros.h"
template <typename T>
struct Tuple {
T min;
T max;
T mid;
constexpr Tuple() {
min = std::numeric_limits<T>::min();
max = std::numeric_limits<T>::max();
mid = std::midpoint(min, max);
}
};
template <typename T>
constexpr void test_cmp_less1() {
constexpr Tuple<T> tup;
assert(std::cmp_less(T(0), T(1)));
assert(std::cmp_less(T(1), T(2)));
assert(std::cmp_less(tup.min, tup.max));
assert(std::cmp_less(tup.min, tup.mid));
assert(std::cmp_less(tup.mid, tup.max));
assert(!std::cmp_less(T(1), T(0)));
assert(!std::cmp_less(T(10), T(5)));
assert(!std::cmp_less(tup.max, tup.min));
assert(!std::cmp_less(tup.mid, tup.min));
assert(!std::cmp_less(tup.mid, tup.mid));
assert(!std::cmp_less(tup.min, tup.min));
assert(!std::cmp_less(tup.max, tup.max));
assert(!std::cmp_less(tup.max, 1));
assert(!std::cmp_less(1, tup.min));
assert(!std::cmp_less(T(-1), T(-1)));
assert(!std::cmp_less(-2, tup.min) == std::is_signed_v<T>);
assert(std::cmp_less(tup.min, -2) == std::is_signed_v<T>);
assert(std::cmp_less(-2, tup.max));
assert(!std::cmp_less(tup.max, -2));
}
template <typename T, typename U>
constexpr void test_cmp_less2() {
assert(std::cmp_less(T(0), U(1)));
assert(!std::cmp_less(T(1), U(0)));
}
template <class... Ts>
constexpr void test1(const std::tuple<Ts...>&) {
(test_cmp_less1<Ts>() , ...);
}
template <class T, class... Us>
constexpr void test2_impl(const std::tuple<Us...>&) {
(test_cmp_less2<T, Us>() , ...);
}
template <class... Ts, class UTuple>
constexpr void test2(const std::tuple<Ts...>&, const UTuple& utuple) {
(test2_impl<Ts>(utuple) , ...);
}
constexpr bool test() {
std::tuple<
#ifndef _LIBCPP_HAS_NO_INT128
__int128_t, __uint128_t,
#endif
unsigned long long, long long, unsigned long, long, unsigned int, int,
unsigned short, short, unsigned char, signed char> types;
test1(types);
test2(types, types);
return true;
}
int main() {
ASSERT_NOEXCEPT(std::cmp_less(0, 1));
test();
static_assert(test());
return 0;
}
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