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 (C++20) true
char16_t (C++11) true
char32_t (C++11) true
short true
unsigned short true
int true
unsigned int true
long true
unsigned long true
long long (C++11) true
unsigned long long (C++11) true
float false
double false
long double false


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

identifies integer types
(public static member constant)
identifies signed types
(public static member constant)
identifies types that represent a finite set of values
(public static member constant)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.