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Thinking in C++
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You can inject a friend declaration into a namespace by declaring it within an enclosed class:

//: C10:FriendInjection.cpp
namespace Me {
  class Us {
    friend void you();
int main() {} ///:~

Now the function you( ) is a member of the namespace Me.

If you introduce a friend within a class in the global namespace, the friend is injected globally.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire