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      std::is_move_assignable, std::is_trivially_move_assignable, std::is_nothrow_move_assignable

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      C++
       
      Biblioteca de utilitários
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      Os operadores relacionais
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      Relational operators
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      rel_ops::operator!=
      rel_ops::operator>
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      Pairs and tuples
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      Troque, avançar e avançar
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      Swap, forward and move
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      Apoio a tipos
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      Basic types
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      Tipos fundamentais
      Tipos inteiros de largura fixos(C++11)
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      Numeric limits
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      C numérico limita interface
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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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      Propriedades de tipo
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      Type properties
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      Operações apoiadas
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      Supported operations
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      (C++11)(C++11)(C++11)
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      (C++11)(C++11)(C++11)
      is_move_assignableis_trivially_move_assignableis_nothrow_move_assignable
      (C++11)(C++11)(C++11)
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      Relacionamentos e consultas de propriedade
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      Relationships and property queries
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      Tipo modificações
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      Type modifications
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      Transformações tipo
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      Type transformations
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      Digite constantes traço
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      Type trait constants
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      (C++11)
       
      Definido no cabeçalho <type_traits>
      template<class T >
      struct is_move_assignable;
      		 (1) (desde C++11)
      template<class T >
      struct is_trivially_move_assignable;
      		 (2) (desde C++11)
      template<class T >
      struct is_nothrow_move_assignable;
      		 (3) (desde C++11)
      1)
      Verifica se um tipo é MoveAssignable, ou seja, tem um operador de atribuição acessível explícita ou implícita movimento. Se a exigência for atendida, um membro constante valuetrue igual é fornecida, caso contrário, é valuefalse.
      Original:
      Checks whether a type is MoveAssignable, i.e. has an accessible explicit or implicit move assignment operator. 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 avaliação da expressão de atribuição movimento não irá chamar qualquer operação que não é trivial.
      Original:
      same as 1), but evaluation of the move-assignment expression will not call any operation that is not trivial.
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      3)
      mesmo que 1), mas a avaliação da expressão de atribuição movimento não irá chamar qualquer operação que não está noexcept.
      Original:
      same as 1), but the evaluation of the move-assignment expression will not call any operation that is not noexcept.
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      Índice

      Herdado de std::integral_constant

      Member constants

      value
      [estática]
      true se T is move-assignable, false contrário
      Original:
      true if T is move-assignable, 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
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      Type
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      		 Definition
      value_typebool
      typestd::integral_constant<bool, value>

      [editar]Possível implementação

      template<class T>struct is_move_assignable :std::is_assignable<typenamestd::add_lvalue_reference<T>::type, typenamestd::add_rvalue_reference<T>::type>{};   template<class T>struct is_trivially_move_assignable :std::is_trivially_assignable<typenamestd::add_lvalue_reference<T>::type, typenamestd::add_rvalue_reference<T>::type>{};   template<class T>struct is_nothrow_move_assignable :std::is_nothrow_assignable<typenamestd::add_lvalue_reference<T>::type, typenamestd::add_rvalue_reference<T>::type>{};

      [editar]Exemplo

      #include <iostream>#include <string>#include <type_traits>struct Foo {int n;};int main(){std::cout<<std::boolalpha<<"std::string is nothrow move-assignable? "<< std::is_nothrow_move_assignable<std::string>::value<<'\n'<<"int[2] is move-assignable? "<< std::is_move_assignable<int[2]>::value<<'\n'<<"Foo is trivally move-assignable? "<< std::is_trivially_move_assignable<Foo>::value<<'\n';}

      Saída: 

      std::string is nothrow move-assignable? true int[2] is move-assignable? false Foo is trivially move-assignable? true

      [editar]Veja também

      (C++11)
      (C++11)
      (C++11)
      verifica se um tipo tem um operador de atribuição para um argumento específico
      Original:
      checks if a type has a assignment operator for a specific argument
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      (modelo de classe)[edit]
      (C++11)
      (C++11)
      (C++11)
      verifica se um tipo tem um operador de atribuição de cópia
      Original:
      checks if a type has a copy assignment operator
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      (modelo de classe)[edit]
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/types/is_move_assignable&oldid=24570"
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