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typeid operator

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Linguagem C + +
Tópicos gerais
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General topics
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Controle de fluxo
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Flow control
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Declarações execução condicional
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Conditional execution statements
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Instruções de iteração
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Iteration statements
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Ir declarações
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Jump statements
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Funções
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Functions
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declaração da função
lambda declaração da função
modelo de função
linha especificador
especificações de exceção (obsoleta)
noexcept especificador (C++11)
Exceções
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Exceptions
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Namespaces
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Namespaces
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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
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialização
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Initialization
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Literais
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Literals
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Expressões
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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)
atributos (C++11)
Lança
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Casts
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conversões implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Elenco C-estilo e funcional
Alocação de memória
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Memory allocation
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Classes
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Classes
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Classe propriedades específicas de função
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Class-specific function properties
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Funções membro especiais
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Special member functions
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Modelos
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Templates
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modelo de classe
modelo de função
especialização de modelo
pacotes de parâmetros (C++11)
Diversos
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Miscellaneous
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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.
Original:
Header <typeinfo> must be included before using typeid operator.
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Ambas as versões retornar um objeto do tipo const std::type_info&.
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Both versions return an object of type const std::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.
Original:
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