blob: 03aae465c25732bedb57d66be3cc3a447be9534c [file] [log] [blame]
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include <assert.h>
#include <cmath>
#include <cstdint>
#include <limits>
#include <type_traits>
#include "test_macros.h"
template<class T>
struct correct_size_int
typedef typename std::conditional<sizeof(T) < sizeof(int), int, T>::type type;
template <class Source, class Result>
void test_abs()
Source neg_val = -5;
Source pos_val = 5;
Result res = 5;
ASSERT_SAME_TYPE(decltype(std::abs(neg_val)), Result);
assert(std::abs(neg_val) == res);
assert(std::abs(pos_val) == res);
void test_big()
long long int big_value = std::numeric_limits<long long int>::max(); // a value too big for ints to store
long long int negative_big_value = -big_value;
assert(std::abs(negative_big_value) == big_value); // make sure it doesn't get casted to a smaller type
// The following is helpful to keep in mind:
// 1byte == char <= short <= int <= long <= long long
int main(int, char**)
// On some systems char is unsigned.
// If that is the case, we should just test signed char twice.
typedef std::conditional<
std::is_signed<char>::value, char, signed char
>::type SignedChar;
// All types less than or equal to and not greater than int are promoted to int.
test_abs<short int, int>();
test_abs<SignedChar, int>();
test_abs<signed char, int>();
// These three calls have specific overloads:
test_abs<int, int>();
test_abs<long int, long int>();
test_abs<long long int, long long int>();
// Here there is no guarantee that int is larger than int8_t so we
// use a helper type trait to conditional test against int.
test_abs<std::int8_t, correct_size_int<std::int8_t>::type>();
test_abs<std::int16_t, correct_size_int<std::int16_t>::type>();
test_abs<std::int32_t, correct_size_int<std::int32_t>::type>();
test_abs<std::int64_t, correct_size_int<std::int64_t>::type>();
test_abs<long double, long double>();
test_abs<double, double>();
test_abs<float, float>();
return 0;