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Namespaces

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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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declaração de namespace
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)
Conversões
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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
 
Namespaces fornecem um método para a prevenção de conflitos de nomes em grandes projetos.
Original:
Namespaces provide a method for preventing name conflicts in large projects.
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Símbolos declarados dentro de um bloco namespace são colocados em um escopo nomeado que os impede de serem confundidos com símbolos com nomes idênticos em outros escopos.
Original:
Symbols declared inside a namespace block are placed in a named scope that prevents them from being mistaken for identically-named symbols in other scopes.
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Várias declarações de namespaces com o mesmo nome são permitidos, resultando em um espaço de nomes, incluindo todos os símbolos de todas essas declarações.
Original:
Multiple declarations of namespaces with the same name are allowed, resulting in a namespace including all symbols from all such declarations.
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Índice

[editar] Sintaxe

namespace ns_name { declarations } (1)
inline namespace ns_name { declarations } (2) (a partir do C++ 11)
ns_name::name (3)
using namespace ns_name; (4)
using ns_name::name; (5)

[editar] Explicação

# Declaração da name namespace.
Original:
# Declaration of the namespace name.
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# Declaração da name namespace. Definições aparecerá tanto name dentro e seu namespace de fechamento
Original:
# Declaration of the namespace name. Definitions will appear both inside name and its enclosing namespace
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# Maneira padrão de acesso ao conteúdo namespace.
Original:
# Standard way of accessing namespace content.
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# Fazer todos os símbolos de um espaço acessível no âmbito da directiva usando.
Original:
# Making all symbols of a namespace accessible in the scope of the using directive.
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# Fazer um símbolos específicos de um espaço acessível no âmbito da directiva usando.
Original:
# Making a specific symbols of a namespace accessible in the scope of the using directive.
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[editar] Exemplo

Este exemplo mostra como usar um espaço para criar uma classe que já foi nomeado no namespace std .
Original:
This example shows how to use a namespace to create a class that already has been named in the std namespace.
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#include <vector>
 
namespace vec {
 
    template< typename T >
    class vector {
        // ...
    };
 
} // of vec
 
int main()
{
    std::vector<int> v1; // Standard vector.
    vec::vector<int> v2; // User defined vector.
 
    v1 = v2; // Error: v1 and v2 are different object's type.
 
    {
        using namespace std;
        vector<int> v3; // Same as std::vector
        v1 = v3; // OK
    }
 
    {
        using vec::vector;
        vector<int> v4; // Same as vec::vector
        v2 = v4; // OK
    }
 
    return 0;
}


[editar] Veja também

alias de namespace
cria um alias de um namespace existente
Original:
creates an alias of an existing namespace
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[edit]