std::numeric_limits::is_exact - cppreference.com (original) (raw)
| static const bool is_exact; | | (until C++11) | | -------------------------------- | | ------------- | | static constexpr bool is_exact; | | (since C++11) |
The value of std::numeric_limits<T>::is_exact is true for all arithmetic types T that use exact representation.
[edit] Standard specializations
| T | value of std::numeric_limits<T>::is_exact |
|---|---|
| /* 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] Notes
While all fundamental types T for which std::numeric_limits<T>::is_exact == true are integer types, a library may define exact types that are not integers, e.g. a rational arithmetic type representing fractions.
[edit] See also
| | identifies integer types (public static member constant) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | identifies signed types (public static member constant) [edit] | | | identifies types that represent a finite set of values (public static member constant) [edit] |