Namespaces
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命名空間提供了一種方法，以防止在大型工程項目的名稱衝突.
Original:
Namespaces provide a method for preventing name conflicts in large projects.
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的命名空間塊內聲明的符號被放置在指定的範圍內，防止他們被誤認為是相同名稱的符號，在其它範圍內.
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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允許多個具有相同名稱的命名空間聲明，導致在一個命名空間包括所有這些聲明中所有的符號.
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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目錄 |
[编辑] 語法
namespace ns_name { declarations }
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(1) | ||||||||
inline namespace ns_name { declarations }
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(2) | （C++11 起） | |||||||
ns_name::name
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(3) | ||||||||
using namespace ns_name;
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(4) | ||||||||
using ns_name::name;
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(5) | ||||||||
[编辑] 解釋
| 本節是不完整的 |
＃聲明的命名空間name.
Original:
# Declaration of the namespace name.
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＃聲明的命名空間name。定義將同時顯示的內name，包含它的命名空間
Original:
# Declaration of the namespace name. Definitions will appear both inside name and its enclosing namespace
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＃標準方式訪問命名空間中的內容.
Original:
# Standard way of accessing namespace content.
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＃所有符號訪問的命名空間的using指令的範圍.....
Original:
# Making all symbols of a namespace accessible in the scope of the using directive.
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＃一個特定的符號訪問的命名空間的using指令的範圍.....
Original:
# Making a specific symbols of a namespace accessible in the scope of the using directive.
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[编辑] 為例
這個例子展示了如何使用一個命名空間創建一個類，它已經被命名為
std命名空間中的.
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; }
[编辑] 另請參閱
| 命名空間別名 | 現有的命名空間創建一個別名
Original: creates an alias of an existing namespace The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
