std::numeric_limits<T>::is_specialized
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< cpp | types | numeric limits
C++
Utilities library
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Type support
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| Fixed width floating-point types (C++23) | |||||||||||||||||||||
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| Numeric limits | |||||||||||||||||||||
| C numeric limits interface | |||||||||||||||||||||
| Runtime type information | |||||||||||||||||||||
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std::numeric_limits
| Static constants | ||||
numeric_limits::is_specialized | ||||
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(C++11)
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| Static member functions | ||||
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(C++11)
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| Helper types | ||||
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
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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
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[static]
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identifies integer types (public static member constant) |
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[static]
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identifies the IEC 559/IEEE 754 floating-point types (public static member constant) |
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[static]
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identifies exact types (public static member constant) |
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[static]
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identifies types that represent a finite set of values (public static member constant) |