std::numeric_limits<T>::is_integer
static const bool is_integer; |
(until C++11) | |
static constexpr bool is_integer; |
(since C++11) |
The value of std::numeric_limits<T>::is_integer
is true
for all integer arithmetic types T
and false
otherwise. This constant is meaningful for all specializations.
Standard specializations
T |
value of std::numeric_limits<T>::is_integer |
---|---|
/* 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 |
Example
#include <cstddef> #include <cstdint> #include <numeric> int main() { static_assert( std::numeric_limits<bool>::is_integer && std::numeric_limits<std::size_t>::is_integer && std::numeric_limits<std::int32_t>::is_integer && std::numeric_limits<std::int64_t>::is_integer && std::numeric_limits<decltype(42)>::is_integer && !std::numeric_limits<float>::is_integer && !std::numeric_limits<double>::is_integer && !std::numeric_limits<long double>::is_integer && !std::numeric_limits<decltype([](){})>::is_integer // P0315R4 ); }
See also
(C++11)
|
checks if a type is an integral type (class template) |
[static]
|
identifies signed types (public static member constant) |
[static]
|
identifies exact types (public static member constant) |
[static]
|
identifies types that represent a finite set of values (public static member constant) |
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