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[libc++] Fix std::abs tests

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On systems where sizeof(long) == sizeof(int)
the current tests failed. This commit updates
those tests to work on all systems.
std::abs has specific long specializations
which can be used instead.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@369437 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zoe Carver 2019-08-20 20:44:59 +00:00
parent 76dbc2cb72
commit e44fcf8346
1 changed files with 14 additions and 7 deletions
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21
test/std/numerics/c.math/abs.pass.cpp
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@ -16,7 +16,7 @@
template<class T>
struct correct_size_int
{
typedef typename std::conditional<sizeof(T) <= sizeof(int), int, T>::type type;
typedef typename std::conditional<sizeof(T) < sizeof(int), int, T>::type type;
};
template <class Source, class Result>
@ -39,6 +39,9 @@ void test_big()
assert(std::abs(negative_big_value) == big_value); // make sure it doesnt 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.
@ -47,14 +50,18 @@ int main(int, char**)
std::is_signed<char>::value, char, signed char
>::type SignedChar;
test_abs<short int, typename correct_size_int<short int>::type>();
test_abs<SignedChar, typename correct_size_int<SignedChar>::type>();
test_abs<signed char, typename correct_size_int<signed char>::type>();
// 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>();
test_abs<int, typename correct_size_int<int>::type>();
test_abs<long int, typename correct_size_int<long int>::type>();
test_abs<long long int, typename correct_size_int<long long int>::type>();
// 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, typename correct_size_int<std::int8_t>::type>();
test_abs<std::int16_t, typename correct_size_int<std::int16_t>::type>();
test_abs<std::int32_t, typename correct_size_int<std::int32_t>::type>();