std::is_integral

Defined in header `<type_traits>`
template< class T > struct is_integral;		(since C++11)

Checks whether T is an integral type. Provides the member constant value which is equal to true, if T is the type bool, char, char16_t, char32_t, wchar_t, short, int, long, long long, or any implementation-defined extended integer types, including any signed, unsigned, and cv-qualified variants. Otherwise, value is equal to false.

Inherited from std::integral_constant

Member constants

value

[static]

true if T is an integral type , false otherwise
(public static member constant)

Member functions

operator bool	converts the object to bool, returns `value` (public member function)
operator() (C++14)	returns `value` (public member function)

Member types

Type	Definition
`value_type`	`bool`
`type`	std::integral_constant<bool, value>

[edit] Example

Run this code

#include <iostream>
#include <type_traits>
 
class A {};
 
template <class T>
T f(T i)
{
    static_assert(std::is_integral<T>::value, "Integer required.");
    return i;
}
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_integral<A>::value << '\n';
    std::cout << std::is_integral<float>::value << '\n';
    std::cout << std::is_integral<int>::value << '\n';
    std::cout << f(123) << '\n';
}

Output:

false
false
true
123

[edit] See also

is_integer [static]	identifies integer types (public static member constant of `std::numeric_limits`)
is_floating_point (C++11)	checks if a type is floating-point type (class template)
is_arithmetic (C++11)	checks if a type is arithmetic type (class template)
std::experimental::is_integral_v (library fundamentals TS)	variable template alias of `std::is_integral::value` (variable template)

Language
Standard library headers
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

Type support (basic types, RTTI, type traits)
Dynamic memory management
Error handling
Program utilities
Variadic functions
Date and time
Function objects
initializer_list (C++11)
bitset
hash (C++11)
Relational operators
rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
Optional and any
optional (C++17)
any (C++17)
Pairs and tuples
pair
tuple (C++11)
apply (C++17)
piecewise_construct_t (C++11)
piecewise_construct (C++11)
integer_sequence (C++14)
Swap, forward and move
swap
exchange (C++14)
forward (C++11)
move (C++11)
move_if_noexcept (C++11)
Type operations
declval (C++11)
as_const (C++17)