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Lets say I had two systems (each its own cpp file). I want each system to have its own namespace, thats easy enough. The problem is, now I want 'system one' to be able to read/write to some of 'system two's' data, or perhaps call one of its functions. If it were a simple matter of two namespaces in one cpp, this would be easy (via namespace::variable), but with multiple cpp's it doesnt work.

In short, how do you tell one cpp about another cpp's namespace?

*edit nevermind. according to this little thing I found on msdn, it looks like you just need to specify what namespace your variable/function belongs to in the declaration itself (ala int namespace1::a) then any file in your program can access it (ala namespace1::a).