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std::numeric_limits<T>:: is_exact

From cppreference.net
C++
Utilities library
Type support
std::numeric_limits
Static constants
numeric_limits::is_exact
(C++11)
Static member functions
(C++11)
Helper types
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 (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

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.

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)