std::numeric_limits<T>::is_integer

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`
signedchar	`true`
unsignedchar	`true`
wchar_t	`true`
char8_t (since C++20)	`true`
char16_t (since C++11)	`true`
char32_t (since C++11)	`true`
short	`true`
unsignedshort	`true`
int	`true`
unsignedint	`true`
long	`true`
unsignedlong	`true`
longlong (since C++11)	`true`
unsignedlonglong (since C++11)	`true`
float	`false`
double	`false`
longdouble	`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() {}

integral (C++20)	specifies that a type is an integral type (concept)
is_integral (C++11)	checks if a type is an integral type (class template)
is_integral_type (C++26)	checks if reflected type is an integral type (function)
is_signed [static]	identifies signed types (public static member constant)
is_exact [static]	identifies exact types (public static member constant)
is_bounded [static]	identifies types that represent a finite set of values (public static member constant)

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std::numeric_limits<T>::is_integer

Standard specializations

Example

See also