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std::is_trivial

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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_trivial;
(seit C++11)
Wenn T eine triviale Art (das heißt, eine skalare Typ, ein trivial kopierbar Klasse mit einer trivialen Standardkonstruktor oder Anordnung solcher Art / Klasse, möglicherweise cv-qualifiziert) ist, stellt das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .
Original:
If T is a trivial type (that is, a scalar type, a trivially copyable class with a trivial default constructor, or array of such type/class, possibly cv-qualified), provides the member constant value equal true. For any other type, value is false.
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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
true wenn T is a trivial type , false anders
Original:
true if T is a trivial 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

Nur Objekte (einschließlich Arrays) von trivialen Art können durch einen Aufruf std::malloc erstellt werden .
Original:
Only objects (including arrays) of trivial type may be created by a call to std::malloc.
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[Bearbeiten] Mögliche Implementierung

template< class T >
struct is_trivial : std::integral_constant< 
    bool,
    std::is_trivially_copyable<T>::value &&
    std::is_trivially_default_constructible<T>::value 
> {};

[Bearbeiten] Beispiel

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    B() {}
};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_trivial<A>::value << '\n';
    std::cout << std::is_trivial<B>::value << '\n';
}

Output:

true
false

[Bearbeiten] Siehe auch

checks if a type is trivially copyable
(Klassen-Template) [edit]