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Here sys is a namespace.
If we use sys::xx, I know exactly the meaning of ::, but I saw a code, it's using 

::sys::xx;

what's the meaning by putting :: before a namespace?

GSerg
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irwin.jiangwei
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1 Answers1

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It means: look in the global namespace (::) for something named sys. Then look in that scope (class/struct/namespace) for something called xx.

Jesper Juhl
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