79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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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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#include <assert.h>
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#include <cmath>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include "test_macros.h"
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template<class T>
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struct correct_size_int
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{
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typedef typename std::conditional<sizeof(T) < sizeof(int), int, T>::type type;
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};
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template <class Source, class Result>
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void test_abs()
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{
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Source neg_val = -5;
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Source pos_val = 5;
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Result res = 5;
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ASSERT_SAME_TYPE(decltype(std::abs(neg_val)), Result);
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assert(std::abs(neg_val) == res);
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assert(std::abs(pos_val) == res);
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}
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void test_big()
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{
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long long int big_value = std::numeric_limits<long long int>::max(); // a value too big for ints to store
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long long int negative_big_value = -big_value;
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assert(std::abs(negative_big_value) == big_value); // make sure it doesn't get casted to a smaller type
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}
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// The following is helpful to keep in mind:
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// 1byte == char <= short <= int <= long <= long long
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int main(int, char**)
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{
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// On some systems char is unsigned.
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// If that is the case, we should just test signed char twice.
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typedef std::conditional<
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std::is_signed<char>::value, char, signed char
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>::type SignedChar;
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// All types less than or equal to and not greater than int are promoted to int.
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test_abs<short int, int>();
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test_abs<SignedChar, int>();
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test_abs<signed char, int>();
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// These three calls have specific overloads:
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test_abs<int, int>();
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test_abs<long int, long int>();
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test_abs<long long int, long long int>();
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// Here there is no guarantee that int is larger than int8_t so we
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// use a helper type trait to conditional test against int.
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test_abs<std::int8_t, correct_size_int<std::int8_t>::type>();
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test_abs<std::int16_t, correct_size_int<std::int16_t>::type>();
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test_abs<std::int32_t, correct_size_int<std::int32_t>::type>();
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test_abs<std::int64_t, correct_size_int<std::int64_t>::type>();
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test_abs<long double, long double>();
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test_abs<double, double>();
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test_abs<float, float>();
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test_big();
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return 0;
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}
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