Question about performance

Nope. No performance difference.

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Qui fut tout, et qui ne fut rien
Invader''s Realm

Doesn''t the compiler cut and paste the .h files to the main .cpp thus the respective library .c/.cpp files as well?

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Nope. No performance difference.

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That is not entirely true. With most compilers, a function can only be inlined if the calling file can "see" the function. If the function is in another file, it gets linked, and the calling file can''t see that function directly. I think the .NET compiler will let you inline from an external source file, which solves this problem.

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Doesn''t the compiler cut and paste the .h files to the main .cpp thus the respective library .c/.cpp files as well?

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The header files basically get cut and paste, but not the source files (.c, .cpp). The source files get compiled seperately into object files, and then the linker links the object files and makes one executable. This is the main reason why you cannot inline a function that is implemented in another source file. Newer compilers will probably start allowing broader inlining in the future.

This is also why templates are often glued to the header file. It''s kind of hard to generate a specialized function/class with out the information needed to do it. This too is planned to be changed in the future.