Namespace aliases

 

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命名空间声明	命名空间的别名
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内联汇编

 

命名空间别名允许程序员定义的命名空间的另一个名字.....

Original:

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

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它们通常用于长或深度嵌套的命名空间作为一种方便快捷.

Original:

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

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语法

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

解释

新的别名alias_name提供的另一种方法访问ns_name.

Original:

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

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alias_name必须是以前没有使用过的名称。 alias_name是有效的持续时间的范围在它被引入.

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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为例

#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

另请参阅

命名空间声明	标识命名空间 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.