C++ 重命名命名空间
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Renaming namespaces
提问by ereOn
I've been doing C++ for a long time now but I just faced a question this morning to which I couldn't give an answer: "Is it possible to create aliases for namespaces in C++ ?"
我已经使用 C++ 很长时间了，但今天早上我刚刚遇到一个问题，我无法回答：“是否可以在 C++ 中为命名空间创建别名？”
Let me give an example. Let's say I had the following header:
让我举个例子吧。假设我有以下标题：
namespace old
{
class SomeClass {};
}
Which, for unspecified reasons had to become:
其中，出于未指明的原因必须变成：
namespace _new
{
namespace nested
{
class SomeClass {}; // SomeClass hasn't changed
}
}
Now if I have an old code base which refers to SomeClass, I can quickly (and dirtily) "fix" the change by adding:
现在，如果我有一个引用 的旧代码库SomeClass，我可以通过添加以下内容来快速（并且肮脏地）“修复”更改：
namespace old
{
typedef _new::nested::SomeClass SomeClass;
}
But is there a way to import everythingfrom _new::nestedinto oldwithout having to typedefexplicitely every type ?
但是有没有一种方法可以将所有内容从_new::nestedinto 导入old而不必typedef明确地导入每种类型？
Something similar to Python import * from ....
类似于 Python 的东西import * from ...。
Thank you.
谢谢你。
回答by Xeo
using namespace new::nested;
Or if you actually want a real alias:
或者，如果您确实想要一个真正的别名：
namespace on = one::nested;
回答by Xeo
This:
这个：
namespace old = newns::nested;
would seem to be what you want.
似乎是你想要的。
