Namespace
Varianti

Namespace aliases

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Linguaggio C + +
Temi generali
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General topics
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Controllo del flusso
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Flow control
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Dichiarazioni esecuzione condizionale
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Conditional execution statements
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Iterazione dichiarazioni
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Iteration statements
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Vai dichiarazioni
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Jump statements
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Funzioni
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Functions
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
Eccezioni
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Exceptions
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Spazi dei nomi
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Namespaces
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alias dello spazio dei nomi
Tipi
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv specificatori
Durata di stoccaggio specificatori
constexpr specificatore (C++11)
specificatore auto (C++11)
alignas specificatore (C++11)
Inizializzazione
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Initialization
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Letterali
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Literals
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Espressioni
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Expressions
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rappresentazioni alternative
Utilities
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Utilities
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Tipi
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Types
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
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Casts
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conversioni implicite
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Fusione C-stile e funzionale
Occupazione della memoria
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Memory allocation
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Classi
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Classes
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Specifiche per una classe di funzioni proprietà
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Class-specific function properties
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esplicito (C++11)
statico
Funzioni membro speciali
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Special member functions
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Modelli
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Templates
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classe template
funzione di modello
modello di specializzazione
parametri confezioni (C++11)
Varie
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Miscellaneous
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Montaggio in linea
 
Alias ​​dello spazio dei nomi consentono al programmatore di definire un nome alternativo per uno spazio dei nomi.
Original:
Namespace aliases allow the programmer to define an alternate name for a namespace.
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Essi sono comunemente utilizzati come una comoda scorciatoia per gli spazi dei nomi lunghi o profondamente nidificata.
Original:
They are commonly used as a convenient shortcut for long or deeply-nested namespaces.
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Indice

[modifica] Sintassi

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

[modifica] Spiegazione

Il nuovo alias alias_name fornisce un metodo alternativo per accedere ns_name.
Original:
The new alias alias_name provides an alternate method of accessing ns_name.
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alias_name deve essere un nome non utilizzato in precedenza. alias_name è valido per la durata di applicazione in cui viene introdotta.
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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[modifica] Esempio

#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

[modifica] Vedi anche

namespace dichiarazione
identifica uno spazio dei nomi
Original:
identifies a namespace
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[edit]