What's the benefit of declaring class functions separately from their actual functionality?

Dependency management. Users of the class only need to include the header file, so they don't depend on the implementation Another use is breaking circular dependencies Both issues may look like a waste of time with toy programs, but they start to grow into a really bad problem as the program grows.

Dependency management. Users of the class only need to include the header file, so they don't depend on the implementation. Another use is breaking circular dependencies.

Both issues may look like a waste of time with toy programs, but they start to grow into a really bad problem as the program grows.

1 For an example see stackoverflow. Com/questions/625799/… – SDX2000 May 26 '10 at 15:05 Dependency management even becomes critical for programs spanning a few hundreds of thousands of lines. You don't want to recompile the whole thing when someone changes a comment :/ – Matthieu M.

May 26 '10 at 15:29.

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