NAME¶

std::numeric_limits::is_integer - std::numeric_limits::is_integer

Synopsis¶

static const bool is_integer; (until C++11)
static constexpr bool is_integer; (since C++11)

The value of std::numeric_limits<T>::is_integer is true for all integer arithmetic
types T and false otherwise. This constant is meaningful for all specializations.

Standard specializations¶

T value of std::numeric_limits<T>::is_integer
/* non-specialized */ false
bool true
char true
signed char true
unsigned char true
wchar_t true
char8_t (since C++20) true
char16_t (since C++11) true
char32_t (since C++11) true
short true
unsigned short true
int true
unsigned int true
long true
unsigned long true
long long (since C++11) true
unsigned long long (since C++11) true
float false
double false
long double false

Example¶

// Run this code

#include <cstddef>
#include <cstdint>
#include <limits>

static_assert
(
std::numeric_limits<bool>::is_integer
&& std::numeric_limits<std::size_t>::is_integer
&& std::numeric_limits<std::int32_t>::is_integer
&& std::numeric_limits<std::int64_t>::is_integer
&& std::numeric_limits<decltype(42)>::is_integer
&& !std::numeric_limits<int*>::is_integer
&& !std::numeric_limits<float>::is_integer
&& !std::numeric_limits<double>::is_integer
&& !std::numeric_limits<long double>::is_integer
&& !std::numeric_limits<decltype([](){})>::is_integer // P0315R4
);

int main() {}

See also¶

is_integral checks if a type is an integral type
(C++11) (class template)
is_signed identifies signed types
[static] (public static member constant)
is_exact identifies exact types
[static] (public static member constant)
is_bounded identifies types that represent a finite set of values
[static] (public static member constant)