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std::is_destructible, std::is_trivially_destructible, std::is_nothrow_destructible

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Grundtypen
Original:
Basic types
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Grundtypen
Feste Breite Integer-Typen (C++11)
Numerische Grenzen
Original:
Numeric limits
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numeric_limits
C numerische begrenzt Schnittstelle
Laufzeit-Typinformationen
Original:
Runtime type information
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Exterieur
Original:
Type traits
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Primären Typ Kategorien
Original:
Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Typ Eigenschaften
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
Unterstützte Operationen
Original:
Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
Beziehungen und Eigentum Abfragen
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Typ Modifikationen
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Type modifications
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remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Typ Transformationen
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Typ-Trait-Konstanten
Original:
Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_destructible;
(1) (seit C++11)
template< class T >
struct is_trivially_destructible;
(2) (seit C++11)
template< class T >
struct is_nothrow_destructible;
(3) (seit C++11)
1)
Wenn eine imaginäre struct enthaltend ein Element vom Typ T eine nicht gelöschte destructor, liefert das Element konstant value gleich true. Für jede andere Art, value ist false .
Original:
If an imaginary struct containing a member object of type T has a non-deleted destructor, provides the member constant value equal true. For any other type, value is false.
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2)
wie 1), aber der Destruktor nicht aufgerufen sämtliche Aufgaben, die nicht trivial ist .
Original:
same as 1), but the destructor does not call any operation that is not trivial.
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3)
wie 1), aber der Destruktor noexcept .
Original:
same as 1), but the destructor is noexcept.
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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
true wenn T is destructible, false anders
Original:
true if T is destructible, false otherwise
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(public static Mitglied konstanten)

Member functions

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

Member types

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

[Bearbeiten] Notes

Da die C + +-Programm wird ein Destruktor löst eine Ausnahme während Stack Unwinding (die in der Regel nicht vorhergesagt werden kann), sind alle praktischen Destruktoren nicht werfen, auch wenn sie nicht deklariert noexcept. Alle Destruktoren in der C + +-Standard-Bibliothek zu finden sind non-Werfen .
Original:
Because the C++ program terminates if a destructor throws an exception during stack unwinding (which usually cannot be predicted), all practical destructors are non-throwing even if they are not declared noexcept. All destructors found in the C++ standard library are non-throwing.
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[Bearbeiten] Beispiel

#include <iostream>
#include <string>
#include <type_traits>
struct Foo {
   std::string str;
   ~Foo() noexcept {};
};
struct Bar {
    ~Bar() = default;
};
int main() {
    std::cout << std::boolalpha
              << "std::string is destructible? "
              << std::is_destructible<std::string>::value << '\n'
              << "Foo is nothrow destructible? "
              << std::is_nothrow_destructible<Foo>::value << '\n'
              << "Bar is trivally destructible? "
              << std::is_trivially_destructible<Bar>::value << '\n';
}

Output:

std::string is destructible? true
Foo is nothrow destructible? true
Bar is trivally destructible? true

[Bearbeiten] Siehe auch

prüft, ob ein Typ hat einen Konstruktor für Argumente
Original:
checks if a type has a constructor for specific arguments
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(Klassen-Template) [edit]
prüft, ob ein Typ hat einen virtuellen Destruktor
Original:
checks if a type has a virtual destructor
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(Klassen-Template) [edit]