std::integral

 

C++

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Concepts library

Core language concepts same_as (C++20) derived_from (C++20) convertible_to (C++20) common_reference_with (C++20) common_with (C++20) integral (C++20) signed_integral (C++20) unsigned_integral (C++20) floating_point (C++20) swappableswappable_with (C++20)(C++20) destructible (C++20) constructible_from (C++20) default_initializable (C++20)   move_constructible (C++20) copy_constructible (C++20) assignable_from (C++20)

Comparison concepts equality_comparableequality_comparable_with (C++20)(C++20) totally_orderedtotally_ordered_with (C++20)(C++20) Object concepts movable (C++20) copyable (C++20) semiregular (C++20) regular (C++20) Callable concepts invocableregular_invocable (C++20)(C++20) predicate (C++20) relation (C++20) equivalence_relation (C++20) strict_weak_order (C++20)

Exposition-only concepts boolean-testable  (C++20)

 

Defined in header <concepts>
template<class T > concept integral =std::is_integral_v<T>;		(since C++20)

The concept integral<T> is satisfied if and only if T is an integral type.

Example

Run this code

#include <concepts>#include <iostream>   void print(std::integralauto i){std::cout<<"Integral: "<< i <<'\n';}   void print(auto x){std::cout<<"Non-integral: "<< x <<'\n';}   int main(){std::cout<<std::boolalpha;   static_assert(std::integral<bool>); print(true);   static_assert(std::integral<char>); print('o');   static_assert(std::integral<int>); print(007);   static_assert(! std::integral<double>); print(2e2);   static_assert(! std::integral<decltype("")>); print("∫∫∫");}

Output:

Integral: true Integral: o Integral: 7 Non-integral: 200 Non-integral: ∫∫∫

References

• C++23 standard (ISO/IEC 14882:2024):

• 18.4.7 Arithmetic concepts [concepts.arithmetic]

• C++20 standard (ISO/IEC 14882:2020):

• 18.4.7 Arithmetic concepts [concepts.arithmetic]

See also

is_integral (C++11)

checks if a type is an integral type (class template)