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std::is_arithmetic

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Basic types
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Grundtypen
Feste Breite Integer-Typen (C++11)
Numerische Grenzen
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Numeric limits
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numeric_limits
C numerische begrenzt Schnittstelle
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Runtime type information
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Type traits
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is_void(C++11)
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is_compound(C++11)
is_integral(C++11)
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is_fundamental(C++11)
is_arithmetic(C++11)
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is_const(C++11)
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is_constructible
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has_virtual_destructor(C++11)
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is_same(C++11)
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aligned_storage(C++11)
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_arithmetic;
(seit 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.

Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
true wenn T is an arithmetic type , false anders
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true if T is an arithmetic type , false otherwise
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(public static Mitglied konstanten)

Member functions

operator bool
wandelt das Objekt bool, gibt value
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converts the object to bool, returns value
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(öffentliche Elementfunktion)

Member types

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

[Bearbeiten] Notes

Arithmetic types are the types for which the built-in arithmetischen Operatoren (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions)

Specializations of std::numeric_limits are provided for all arithmetic types.

[Bearbeiten] Mögliche Implementierung

template< class T >
struct is_arithmetic : std::integral_constant<bool,
                                              std::is_integral<T>::value ||
                                              std::is_floating_point<T>::value> {};

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

prüft, ob ein Typ ist integraler Typ
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checks if a type is integral type
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(Klassen-Template) [edit]
prüft, ob ein Typ ist Fließkomma-Typ
Original:
checks if a type is floating-point type
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(Klassen-Template) [edit]