std::numeric_limits<T>::is_integer
From cppreference.com
< cpp | types | numeric limits
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.
[edit] 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 |
[edit] 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() {}
[edit] See also
| (C++11) |
checks if a type is an integral type (class template) |
| [static] |
identifies signed types (public static member constant) |
| [static] |
identifies exact types (public static member constant) |
| [static] |
identifies types that represent a finite set of values (public static member constant) |
