std::numeric_limits::is_exact
From cppreference.com
< cpp | types | numeric limits
| 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 |
| char16_t | true |
| char32_t | true |
| short | true |
| unsigned short | true |
| int | true |
| unsigned int | true |
| long | true |
| unsigned long | true |
| long long | true |
| unsigned long long | 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 aren't integers, e.g. a rational arithmetics type representing fractions.
[edit] See also
| [static] |
identifies integer types (public static member constant) |
| [static] |
identifies signed types (public static member constant) |
| [static] |
identifies types that represent a finite set of values (public static member constant) |