std::numeric_limits<T>::is_specialized

static const bool is_specialized;		(until C++11)
static constexpr bool is_specialized;		(since C++11)

The value of std::numeric_limits<T>::is_specialized is true for all T for which there exists a specialization of std::numeric_limits.

Standard specializations

T	value of std::numeric_limits<T>::is_specialized
/* 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	true
double	true
long double	true

See also

is_integer [static]	identifies integer types (public static member constant)
is_iec559 [static]	identifies the IEC 559/IEEE 754 floating-point types (public static member constant)
is_exact [static]	identifies exact types (public static member constant)
is_bounded [static]	identifies types that represent a finite set of values (public static member constant)