std::numeric_limits<T>::is_integer

std::numeric_limits<T>::is_integer - cppreference.com

From cppreference.com

`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

#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() {}

	checks if a type is an integral type (class template) [edit]
	identifies signed types (public static member constant) [edit]
	identifies exact types (public static member constant) [edit]
	identifies types that represent a finite set of values (public static member constant) [edit]

Standard specializations

Example

See also