Namespace aliases

 

C++

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Lenguaje C++

Los temas generales Original: General topics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Preprocessor Comentarios Palabras clave	Tabla ASCII Las secuencias de escape Historia de C++
Control de flujo Original: Flow control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Sentencias condicionales ejecución Original: Conditional execution statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
if statement	switch statement
Instrucciones de iteración Original: Iteration statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
for loop range-for loop (C++11)	while loop do-while loop
Ir declaraciones Original: Jump statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
continue statement break statement	goto statement return statement
Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
declaración de la función
lambda declaración de la función
función de plantilla
especificador inline
especificaciones de excepción (obsoleto)
noexcept especificador (C++11)
Excepciones Original: Exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
tirar expresión	bloque try-catch
Los espacios de nombres Original: Namespaces The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
espacio de nombres declaración	alias de espacios de nombres
Tipos Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
tipos fundamentales tipos de compuestos los tipos de enumeración	tipos de unión tipos de funciones
decltype specifier (C++11)
Los especificadores Original: Specifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
cv especificadores
almacenamiento duración especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialización Original: Initialization The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
predeterminado de inicialización valor de inicialización cero de inicialización copiar inicialización inicialización directa	inicialización de agregados lista de inicialización (C++11) inicialización constante referencia de inicialización

Los literales Original: Literals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
literales enteros Los literales de caracteres Los literales de punto flotante literales de cadena	Los literales booleanos nullptr (C++11) definido por el usuario (C++11)
Expresiones Original: Expressions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
categorías de valor orden de evaluación	los operadores prioridad de los operadores
representaciones alternativas
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typedef declaration
alias de tipo de declaración (C++11)
atributos (C++11)
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new expression	delete expression
Clases Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clase de declaración this pointer acceder a los especificadores	amigo especificador listas de inicializadores
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función virtual anular especificador (C++11) último especificador (C++11)	explícita (C++11) estático
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default constructor copiar constructor mover constructor (C++11)	copiar asignación mover asignación (C++11) destructor
Plantillas Original: Templates The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clase de plantilla
función de plantilla
plantilla de especialización
paquetes de parámetros (C++11)
Varios Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Montaje en línea

 

Alias ​​de espacios de nombres permiten al programador definir un nombre alternativo para un espacio de nombres .

Original:

Namespace aliases allow the programmer to define an alternate name for a namespace.

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Son de uso general como un atajo conveniente para los espacios de nombres largos o profundamente anidado .

Original:

They are commonly used as a convenient shortcut for long or deeply-nested namespaces.

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Sintaxis

namespace alias_name = ns_name;	(1)
namespace alias_name = ::ns_name;	(2)
namespace alias_name = nested_name::ns_name;	(3)

Explicación

El nuevo alias alias_name proporciona un método alternativo de acceso ns_name .

Original:

The new alias alias_name provides an alternate method of accessing ns_name.

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alias_name debe ser un nombre no utilizado previamente. alias_name es válida para la duración del ámbito en el que se introduce .

Original:

alias_name must be a name not previously used. alias_name is valid for the duration of the scope in which it is introduced.

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Ejemplo

#include <iostream>
 
namespace foo {
    namespace bar {
         namespace baz {
             int qux = 42;
         }
    }
}
 
namespace fbz = foo::bar::baz;
 
int main()
{
    std::cout << fbz::qux << '\n';
}

Output:

42

Ver también

espacio de nombres declaración	identifica un espacio de nombres Original: identifies a namespace The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.