std::numeric_limits<T>::is_specialized
From cppreference.com
< cpp | types | numeric limits
static const bool is_specialized; |
(until C++11) | |
| static constexpr bool is_specialized; |
(since C++11) | |
The value of std::numeric_limits<T>::is_specialized is true for all T for which there exists a specialization of std::numeric_limits.
Standard specializations
T
|
value of std::numeric_limits<T>::is_specialized |
| /* 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 | true |
| double | true |
| long double | true |
Example
Run this code
#include <iostream> #include <limits> #include <type_traits> int main() { enum E{}; std::cout << std::boolalpha << std::numeric_limits<bool>::is_specialized << '\n' << std::numeric_limits<long long>::is_specialized << '\n' << std::numeric_limits<std::true_type>::is_specialized << '\n' << std::numeric_limits<E>::is_specialized << '\n'; }
Possible output:
true true false false
See also
| [static] |
identifies integer types (public static member constant) |
| [static] |
identifies the IEC 559/IEEE 754 floating-point 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) |