std::is_integral
From cppreference.com
Defined in header
<type_traits>
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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.
Contents |
[edit] Template parameters
T | - | a type to check |
Inherited from std::integral_constant
Member constants
value
[static]
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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)
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returns value (public member function) |
Member types
Type | Definition |
value_type
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bool
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type
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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
[static]
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identifies integer types (public static member constant of std::numeric_limits )
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(C++11)
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checks if a type is floating-point type (class template) |
(C++11)
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checks if a type is arithmetic type (class template) |
(library fundamentals TS)
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variable template alias of std::is_integral::value (variable template) |