std::is_arithmetic
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<metanoindex/>
<tbody> </tbody>| Elemento definito nell'header <type_traits>
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template< class T > struct is_arithmetic; |
(dal C++11) | |
If T is an arithmetic type (that is, an integral type or a floating-point type), provides the member constant value equal true. For any other type, value is false.
Inherited from std::integral_constant
Member constants
value [statico] |
true se T is an arithmetic type , false altrimenti Original: true if T is an arithmetic type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (pubblico membro statico costante) |
Member functions
operator bool |
converte l'oggetto in bool, restituisce value Original: converts the object to bool, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) |
Member types
Tipo
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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bool
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type
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std::integral_constant<bool, value>
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Note
Arithmetic types are the types for which the built-in operatori aritmetici (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions)
Specializations of std::numeric_limits are provided for all arithmetic types.
Possibile implementazione
template< class T >
struct is_arithmetic : std::integral_constant<bool,
std::is_integral<T>::value ||
std::is_floating_point<T>::value> {};
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Esempio
#include <iostream>
#include <type_traits>
class A {};
int main()
{
std::cout << std::boolalpha;
std::cout << std::is_arithmetic<A>::value << '\n';
std::cout << std::is_arithmetic<int>::value << '\n';
std::cout << std::is_arithmetic<int&>::value << '\n';
std::cout << std::is_arithmetic<int*>::value << '\n';
std::cout << std::is_arithmetic<float>::value << '\n';
std::cout << std::is_arithmetic<float&>::value << '\n';
std::cout << std::is_arithmetic<float*>::value << '\n';
}
Output:
false
true
false
false
true
false
false
Vedi anche
(C++11) |
controlla se un tipo è di tipo integrale Original: checks if a type is integral type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) |
(C++11) |
Verifica se un tipo è tipo a virgola mobile Original: checks if a type is floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) |