std::numeric_limits<T>::is_signed (3) - Linux Manuals
std::numeric_limits<T>::is_signed: std::numeric_limits<T>::is_signed
NAME
std::numeric_limits<T>::is_signed - std::numeric_limits<T>::is_signed
Synopsis
static const bool is_signed; (until C++11)
static constexpr bool is_signed; (since C++11)
The value of std::numeric_limits<T>::is_signed is true for all signed arithmetic types T and false for the unsigned types. This constant is meaningful for all specializations.
Standard specializations
T value of std::numeric_limits<T>::is_signed
/* non-specialized */ false
bool false
char implementation-defined
signed char true
unsigned char false
wchar_t implementation-defined
char8_t false
char16_t false
char32_t false
short true
unsigned short false
int true
unsigned int false
long true
unsigned long false
long long true
unsigned long long false
float true
double true
long double true
See also
is_signed checks if a type is a signed arithmetic type
(C++11)
is_integer identifies integer types
[static]
is_exact identifies exact types
[static]
is_bounded identifies types that represent a finite set of values
[static]