std::is_move_constructible, std::is_trivially_move_constructible, std::is_nothrow_move_constructible

 

C++

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initializer_list (C++11)

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Os operadores relacionais Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pares e tuplas Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Troque, avançar e avançar Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

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Apoio a tipos

Tipos básicos Original: Basic types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Tipos fundamentais
Tipos inteiros de largura fixos(C++11)
ptrdiff_t size_t max_align_t (C++11)	nullptr_t (C++11) offsetof NULL
Limites numéricos Original: Numeric limits The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
numeric_limits
C numérico limita interface
Informações de tipo de tempo de execução Original: Runtime type information The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
type_info type_index (C++11)	bad_typeid bad_cast
Características de tipo Original: Type traits The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Principais categorias de tipo Original: Primary type categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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)
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Propriedades de tipo Original: Type properties The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_const (C++11) is_volatile (C++11) is_pod (C++11) is_empty (C++11) is_polymorphic (C++11) is_abstract (C++11)	is_trivial (C++11) is_trivially_copyable (C++11) is_standard_layout (C++11) is_literal_type (C++11) is_signed (C++11) is_unsigned (C++11)

Operações apoiadas Original: Supported operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_constructibleis_trivially_constructibleis_nothrow_constructible (C++11)(C++11)(C++11)
is_default_constructibleis_trivially_default_constructibleis_nothrow_default_constructible (C++11)(C++11)(C++11)
is_copy_constructibleis_trivially_copy_constructibleis_nothrow_copy_constructible (C++11)(C++11)(C++11)
is_move_constructibleis_trivially_move_constructibleis_nothrow_move_constructible (C++11)(C++11)(C++11)
is_assignableis_trivially_assignableis_nothrow_assignable (C++11)(C++11)(C++11)
is_copy_assignableis_trivially_copy_assignableis_nothrow_copy_assignable (C++11)(C++11)(C++11)
is_move_assignableis_trivially_move_assignableis_nothrow_move_assignable (C++11)(C++11)(C++11)
is_destructibleis_trivially_destructibleis_nothrow_destructible (C++11)(C++11)(C++11)
has_virtual_destructor (C++11)
Relacionamentos e consultas de propriedade Original: Relationships and property queries The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 Original: Type modifications The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
remove_cvremove_constremove_volatile (C++11)(C++11)(C++11) add_cvadd_constadd_volatile (C++11)(C++11)(C++11) make_signed (C++11) make_unsigned (C++11)	remove_reference (C++11) add_lvalue_referenceadd_rvalue_reference (C++11)(C++11) remove_pointer (C++11) add_pointer (C++11) remove_extent (C++11) remove_all_extents (C++11)
Transformações tipo Original: Type transformations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 Original: Type trait constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
integral_constant (C++11)

 

Definido no cabeçalho <type_traits>
template<class T > struct is_move_constructible;	(1)	(desde C++11)
template<class T > struct is_trivially_move_constructible;	(2)	(desde C++11)
template<class T > struct is_nothrow_move_constructible;	(3)	(desde C++11)

1)

Verifica se um tipo é MoveConstructible, ou seja, tem um construtor movimento acessível explícita ou implícita. Se a exigência for atendida, um membro constante valuetrue igual é fornecida, caso contrário, é valuefalse.

Original:

Checks whether a type is MoveConstructible, i.e. has an accessible explicit or implicit move constructor. If the requirement is met, a member constant value equal true is provided, otherwise value is false.

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2)

Mesmo que 1), mas a expressão construtor movimento não põe qualquer operação que não é trivial.

Original:

Same as 1), but the move constructor expression does not call any operation that is not trivial.

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3)

Mesmo que 1), mas a expressão construtor movimento é noexcept.

Original:

Same as 1), but the move constructor expression is noexcept.

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Herdado de std::integral_constant

Member constants

value [estática]	true se T is move-constructible , false contrário Original: true if T is move-constructible , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante)

Member functions

operator bool	converte o objeto em bool, retorna 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. (função pública membro)

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	bool
type	std::integral_constant<bool, value>

Notas

Mover construtores são geralmente noexcept, pois caso contrário, eles não são utilizáveis ​​em qualquer código que fornece garantia exceção forte.

Original:

Move constructors are usually noexcept, since otherwise they are unusable in any code that provides strong exception guarantee.

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Possível implementação

template<class T>struct is_move_constructible :std::is_constructible<T, typenamestd::add_rvalue_reference<T>::type>{};   template<class T>struct is_trivially_move_constructible :std::is_trivially_constructible<T, typenamestd::add_rvalue_reference<T>::type>{};   template<class T>struct is_nothrow_move_constructible :std::is_nothrow_constructible<T, typenamestd::add_rvalue_reference<T>::type>{};

Exemplo

#include <iostream>#include <type_traits>   struct Ex1 {std::string str;// member has a non-trivial but non-throwing move ctor};struct Ex2 {int n; Ex2(Ex2&&)=default;// trivial and non-throwing};   int main(){std::cout<<std::boolalpha<<"Ex1 is move-constructible? "<< std::is_move_constructible<Ex1>::value<<'\n'<<"Ex1 is trivially move-constructible? "<< std::is_trivially_move_constructible<Ex1>::value<<'\n'<<"Ex1 is nothrow move-constructible? "<< std::is_nothrow_move_constructible<Ex1>::value<<'\n'<<"Ex2 is trivially move-constructible? "<< std::is_trivially_move_constructible<Ex2>::value<<'\n'<<"Ex2 is nothrow move-constructible? "<< std::is_nothrow_move_constructible<Ex2>::value<<'\n';}

Saída:

Ex1 is move-constructible? true Ex1 is trivially move-constructible? false Ex1 is nothrow move-constructible? true Ex2 is trivially move-constructible? true Ex2 is nothrow move-constructible? true

Veja também

is_constructible is_trivially_constructible is_nothrow_constructible (C++11) (C++11) (C++11)	verifica se um tipo tem um construtor para argumentos específicos Original: checks if a type has a constructor for specific arguments The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe)
is_default_constructible is_trivially_default_constructible is_nothrow_default_constructible (C++11) (C++11) (C++11)	verifica se um tipo tem um construtor padrão Original: checks if a type has a default constructor The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe)
is_copy_constructible is_trivially_copy_constructible is_nothrow_copy_constructible (C++11) (C++11) (C++11)	verifica se um tipo tem um construtor de cópia Original: checks if a type has a copy constructor The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe)
move_if_noexcept (C++11)	obtém uma referência rvalue se o construtor movimento não joga Original: obtains an rvalue reference if the move constructor does not throw The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função)