c++ - Header and source files function definitions -

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this question has answer here:

i have project , project b under 1 solution in visual studio. project needs use function of class of project b, in project b have file contains header file of project b, let's call allheadersofb.h. file included in stdafx.h file of project a, included in each class of project a.

i have variable of type y in class x, y class of project b , x class of project a. in x, if try use function of y , function declared in .h file , defined in .cpp file have unresolved external link, if function declared , defined in header file doesn't happen.

what doing wrong?

including headers not enough. guess project b library, project a needs link library can access implementation of class/function b.


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