C++

Reference

<type_traits>

class template
<type_traits>

std::is_integral

template <class T> struct is_integral;
Is integral

Trait class that identifies whether T is an integral type.

It inherits from integral_constant as being either true_type or false_type, depending on whether T is an integral type:

fundamental integral types
bool
char
char16_t
char32_t
wchar_t
signed char
short int
int
long int
long long int
unsigned char
unsigned short int
unsigned int
unsigned long int
unsigned long long int

All fundamental integral types, along with all their aliases (like those in cstdint), are considered integral types by this class, including their const and volatile qualified variants.

Enums are not considered integral types in C++ (see is_enum).

Template parameters

T
A type.

Member types

Inherited from integral_constant:
member typedefinition
value_typebool
typeeither true_type or false_type

Member constants

Inherited from integral_constant:
member constantdefinition
valueeither true or false

Member functions

Inherited from integral_constant:
operator bool
Returns value (public member function)

Example

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// is_integral example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_integral:" << std::endl;
  std::cout << "char: " << std::is_integral<char>::value << std::endl;
  std::cout << "int: " << std::is_integral<int>::value << std::endl;
  std::cout << "float: " << std::is_integral<float>::value << std::endl;
  return 0;
}

Output:
is_integral:
char: true
int: true
float: false


See also

is_floating_point
Is floating point (class template)
is_arithmetic
Is arithmetic type (class template)
is_fundamental
Is fundamental type (class template)
is_signed
Is signed type (class template)
is_unsigned
Is unsigned type (class template)