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Typedef declaration

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Lenguaje C++
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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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Ir declaraciones
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Funciones
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declaración de la función
lambda declaración de la función
función de plantilla
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noexcept especificador (C++11)
Excepciones
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Exceptions
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Los espacios de nombres
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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)
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Inicialización
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Initialization
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Los literales
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Expresiones
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representaciones alternativas
Utilidades
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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
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Clases
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Clase propiedades específicas de la función
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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
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paquetes de parámetros (C++11)
Varios
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Montaje en línea
 
La declaración typedef proporciona una forma de crear un alias que se pueden utilizar en cualquier lugar, en lugar de un nombre de tipo (posiblemente compleja) .
Original:
The typedef declaration provides a way to create an alias that can be used anywhere in place of a (possibly complex) type name.
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Contenido

[editar] Sintaxis

typedef type_declaration;

[editar] Explicación

La declaración que sigue a la palabra clave typedef es lo contrario de una declaración de tipo normal (excepto que los especificadores de otro tipo, por ejemplo static, no se puede utilizar). Se podrá declarar uno o varios Indentifiers en la misma línea (por ejemplo, int y un puntero a int), podrá declarar matriz y tipos de funciones, punteros y referencias, tipos de clase, etc Cada identificador introducido en esta declaración se convierte en un typedef-nombre en lugar de un objeto que se convertiría si la palabra clave typedef fue removido .
Original:
The declaration that follows the keyword typedef is otherwise a normal type declaration (except that other type specifiers, e.g. static, cannot be used). It may declare one or many indentifiers on the same line (e.g. int and a pointer to int), it may declare array and function types, pointers and references, class types, etc. Every identifier introduced in this declaration becomes a typedef-name rather than an object that it would become if the keyword typedef was removed.
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Los nombres typedef-son alias de tipos existentes, y no son declaraciones de nuevos tipos. Typedef no se puede utilizar para cambiar el significado de un nombre de tipo existente (incluyendo un nombre typedef-). Una vez declarado, un nombre typedef-sólo puede declararse para referirse a la misma vez. Nombres typedef sólo están en vigor en el ámbito en el que son visibles: las diferentes funciones o declaraciones de clase pueden definir tipos que se denominen con significado diferente .
Original:
The typedef-names are aliases for existing types, and are not declarations of new types. Typedef cannot be used to change the meaning of an existing type name (including a typedef-name). Once declared, a typedef-name may only be redeclared to refer to the same type again. Typedef names are only in effect in the scope where they are visible: different functions or class declarations may define identically-named types with different meaning.
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[editar] Palabras clave

typedef

[editar] Ejemplo

// simple typedef
typedef unsigned long ulong;
 
// the following two objects have the same type
unsigned long l1;
ulong l2;
 
// more complicated typedef
typedef int int_t, *intp_t, (&fp)(int, ulong), arr_t[10];
 
// the following two objects have the same type
int a1[10];
arr_t a2;
 
// common C idiom to avoid having to write "struct S"
typedef struct {int a; int b;} S;
 
// the following two objects have the same type
struct {int a; int b;} s1;
S s2;
 
// error: conflicting type specifier
// typedef static unsigned int uint;
 
// std::add_const, like many other metafunctions, use member typedefs
template< class T>
struct add_const {
    typedef const T type;
};

[editar] Ver también

alias de tipo proporcionar la misma funcionalidad que typedefs utilizando una sintaxis diferente, y son también aplicables a nombres de plantilla .
Original:
alias de tipo provide the same functionality as typedefs using a different syntax, and are also applicable to template names.
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