std::numeric_limits<T>::is_specialized
From cppreference.com
static const bool is_specialized;
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(until C++11) | |
static constexpr bool is_specialized;
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(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)
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true
|
float
|
true
|
double
|
true
|
long double
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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) |