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

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< cpp‎ | types

 
 
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initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
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Tipos básicos
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Basic types
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Tipos fundamentais
Tipos inteiros de largura fixos (C++11)
Limites numéricos
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Numeric limits
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numeric_limits
C numérico limita interface
Informações de tipo de tempo de execução
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Runtime type information
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Características de tipo
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Type traits
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Principais categorias de tipo
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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)
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is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Propriedades de tipo
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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)
Operações apoiadas
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)
Relacionamentos e consultas de propriedade
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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)
Tipo modificações
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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)
Transformações tipo
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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)
Digite constantes traço
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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_destructible;
(1) (a partir do C++ 11)
template< class T >
struct is_trivially_destructible;
(2) (a partir do C++ 11)
template< class T >
struct is_nothrow_destructible;
(3) (a partir do C++ 11)
1)
Se uma estrutura imaginária contendo um objeto membro de T tipo tem um destrutor não-excluído, fornece o membro constante value true igual. Para qualquer outro tipo, é value 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)
mesmo que 1), mas o processo de destruição não põe qualquer operação que não é trivial.
Original:
same as 1), but the destructor does not call any operation that is not trivial.
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3)
mesmo que 1), mas o processo de destruição é noexcept.
Original:
same as 1), but the destructor is noexcept.
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se T is destructible, false contrário
Original:
true if T is destructible, false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
Original:
converts the object to bool, returns value
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(função pública membro)

Member types

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

[editar] Notas

Porque o C + + programa termina se um destruidor lança uma exceção durante a pilha desenrolar (que normalmente não pode ser previsto), todos os destruidores práticas não são jogando mesmo se eles não são declarados noexcept. Todos os destruidores encontrados no C + + biblioteca padrão não são jogando.
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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[editar] Exemplo

#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

[editar] Veja também

verifica se um tipo tem um construtor para argumentos específicos
Original:
checks if a type has a constructor for specific arguments
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(modelo de classe) [edit]
verifica se um tipo tem um destrutor virtual
Original:
checks if a type has a virtual destructor
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(modelo de classe) [edit]