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      typeid operator

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      C++
       
      Linguagem C++
      Tópicos gerais
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      General topics
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      Flow control
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      Conditional execution statements
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      Tipos
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      Types
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      decltype specifier(C++11)
      Especificadores
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      Specifiers
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      cv especificadores
      armazenamento duração especificadores
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      Initialization
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      Expressions
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      representações alternativas
      Utilitários
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      Utilities
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      Tipos
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      Types
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      typedef declaration
      tipo de alias declaração(C++11)
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      Class-specific function properties
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      Assembly embutido
       
      Consultas de informações de um tipo.
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      Queries information of a type.
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      Utilizado quando o tipo real de uma classe base virtual deve ser conhecido.
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      Used where the actual type of a virtual base class must be known.
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      Índice

      [editar]Sintaxe

      typeid(type) (1)
      typeid(expression) (2)
      <typeinfo> cabeçalho deve ser incluído antes de usar operador typeid.
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      Header <typeinfo> must be included before using typeid operator.
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      Ambas as versões retornar um objeto do tipo conststd::type_info&.
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      Both versions return an object of type conststd::type_info&.
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      [editar]Explicação

      1)
      retorna o tipo de informação sobre o type. O tipo será definitivamente conhecido em tempo de compilação e nenhuma sobrecarga de tempo de execução é causado.
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      returns the type information about the type. The type will be definitely known compile time and no runtime overhead is caused.
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      2)
      expressão é avaliada e informação de tipo correspondente ao valor resultante é devolvido. Se o expression está em uma classe base virtual, o tipo real da classe é consultado dinamicamente com alguma sobrecarga de tempo de execução. Caso contrário, o tipo real é tempo de compilação definitivamente conhecido e sem nenhuma sobrecarga de tempo de execução é causado.
      Original:
      expression is evaluated and type information corresponding to the resulting value is returned. If the expression is in a virtual base class, the actual type of the class is queried dynamically with some runtime overhead. Otherwise the actual type is definitely known compile time and no runtime overhead is caused.
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      [editar]Palavras-chave

      typeid

      [editar]Exemplo

      Esta seção está incompleta
      Motivo: sem exemplo
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/language/typeid&oldid=20967"
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