C++ preprocessor path root

Is it possible to process a file path using the C++ preprocessor?

What I want is this GETROOT(开发者_如何学运维 __FILE__ ) expanding into \\myserver\myshare\

Supposing that the path to the file is something like \\myserver\myshare\folder\folder\file.txt

I'm using mcpp on Windows XP

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Depends on the compiler, the preprocessor behaves slightly different on GCC/Microsoft etc. There is not standard-conform way to do that..

On Windows you might try to use build environment variables. Visual Studio can expose these values ($(SolutionDir) etc) to the preprocessor context. Just add a preprocessor value like ROOT_PATH="$(SolutionDir)" (C/C++ -> preprocessor in project settings).

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No, it's not, at least not in a standard way. I couldn't say for sure that there are no compilers anywhere in the world that do it, but it seems unlikely.

What's the use-case that means you can't do it at runtime?