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# 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

is_integer [static] | identifies integer types (public static member constant) [edit]
is_signed [static] | identifies signed types (public static member constant) [edit]
is_bounded [static] | identifies types that represent a finite set of values (public static member constant) [edit]

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