std::numeric_limits<T>::is_exact
< 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.
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 | 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 |
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.
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) |