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      alignof operator (desde C++11)

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      Consultas alinhamento requisitos de um tipo
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      Queries alignment requirements of a type
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      Índice

      [editar]Sintaxe

      alignof(type)
      Retorna um objeto do tipo std::size_t.
      Original:
      Returns an object of type std::size_t.
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      [editar]Explicação

      Retorna o alinhamento em bytes (uma potência inteira de dois) necessário para qualquer instância do type dado, que é um ou outro tipo completo, um tipo de matriz, ou um tipo de referência.
      Original:
      Returns alignment in bytes (an integer power of two) required for any instance of the given type, which is either complete type, an array type, or a reference type.
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      Se o tipo é tipo de referência, o operador retorna o alinhamento de referência tipo, se o tipo é tipo de matriz, exigência de alinhamento do tipo de elemento é retornado.
      Original:
      If the type is reference type, the operator returns the alignment of referenced type; if the type is array type, alignment requirement of the element type is returned.
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      Os tipos char, signedchar e unsignedchar ter mais fraco alinhamento (menor) suportado pela implementação.
      Original:
      The types char, signedchar, and unsignedchar have the weakest (smallest) alignment supported by the implementation.
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      [editar]Palavras-chave

      alignof

      [editar]Exemplo

      #include <iostream>   struct Empty {};   struct Foo {int f2;float f1;char c;};   int main(){std::cout<<"alignment of empty class: "<< alignof(Empty)<<'\n'<<"alignment of pointer : "<< alignof(int*)<<'\n'<<"alignment of char : "<< alignof(char)<<'\n'<<"alignment of Foo : "<< alignof(Foo)<<'\n';}

      Saída: 

      alignment of empty class: 1 alignment of pointer : 8 alignment of char : 1 alignment of Foo : 4

      [editar]Veja também

      alignas especificador
      especifica que o armazenamento para a variável devem ser alinhados por (C++11) quantidade específica
      Original:
      specifies that the storage for the variable should be aligned by specific amount (C++11)
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      [edit]
      (C++11)
      obtém requisitos do tipo de alinhamento
      Original:
      obtains the type's alignment requirements
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      (modelo de classe)[edit]
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