Espacios de nombres
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typeid operator

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Lenguaje C++
Los temas generales
Original:
General topics
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Control de flujo
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Flow control
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Sentencias condicionales ejecución
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Conditional execution statements
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Instrucciones de iteración
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Iteration statements
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Ir declaraciones
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Jump statements
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Funciones
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Functions
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declaración de la función
lambda declaración de la función
función de plantilla
especificador inline
especificaciones de excepción (obsoleto)
noexcept especificador (C++11)
Excepciones
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Exceptions
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Los espacios de nombres
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Namespaces
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Tipos
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Types
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decltype specifier (C++11)
Los especificadores
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Specifiers
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cv especificadores
almacenamiento duración especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialización
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Initialization
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Los literales
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Literals
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Expresiones
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Expressions
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representaciones alternativas
Utilidades
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Utilities
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Tipos
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Types
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typedef declaration
alias de tipo de declaración (C++11)
atributos (C++11)
Lanza
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Casts
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conversiones implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-cast estilo y funcional
De asignación de memoria
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Memory allocation
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Clases
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Classes
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Clase propiedades específicas de la función
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Class-specific function properties
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Funciones especiales miembro
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Special member functions
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Plantillas
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Templates
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clase de plantilla
función de plantilla
plantilla de especialización
paquetes de parámetros (C++11)
Varios
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Miscellaneous
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Montaje en línea
 
Búsquedas información de un tipo .
Original:
Queries information of a type.
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Se utiliza cuando el tipo real de una clase base virtual debe ser conocido .
Original:
Used where the actual type of a virtual base class must be known.
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Contenido

[editar] Sintaxis

typeid( type ) (1)
typeid( expression ) (2)
<typeinfo> cabecera debe ser incluido antes de usar el operador typeid .
Original:
Header <typeinfo> must be included before using typeid operator.
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Ambas versiones devolver un objeto de tipo const std::type_info& .
Original:
Both versions return an object of type const std::type_info&.
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[editar] Explicación

1)
devuelve la información sobre el tipo type. El tipo se conozca con exactitud el tiempo de compilación y tiempo de ejecución de gastos generales no se hizo .
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)
Se evalúa la expresión y la información de tipo correspondiente al valor resultante es devuelto. Si el expression pertenece a una clase base virtual, el tipo real de la clase se realiza una consulta dinámica con cierta sobrecarga en tiempo de ejecución. De lo contrario el tipo real es el tiempo de compilación y sabe definitivamente hay sobrecarga en tiempo de ejecución se hizo .
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] Palabras clave

typeid

[editar] Ejemplo