将`using`指令限制到当前文件 [英] Restricting `using` directives to the current file

问题描述

对于这个愚蠢的问题，很抱歉，但是有任何方式限制使用指令到当前文件，以便它们不会传播到 #include 此文件？

Sorry for this silly question, but is there any way to restrict using directives to the current file so that they don't propagate to the files that #include this file?

推荐答案

可能包含代码以包含在自己的命名空间可以实现

的行为，因为命名空间有作用域。

Perhaps wrapping the code to be included inside its own namespace could achieve the behavior
you want, since name spaces have scope affect.

// FILENAME is the file to be included
namespace FILENAME_NS {
   using namespace std;
   namespace INNER_NS {
      [wrapped code]
   }
}
using namespace FILENAME_NS::INNER_NS;

和其他档案

#include <FILENAME>
// std namespace is not visible, only INNER_NS definitions and declarations
...

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