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//dll project namespace DLL { class DLLclass { void somefunction(); } }
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//EXE project int main() { DLL::DLLclass Dclass; Dclass.somefunction(); }
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//DLL project namespace DLL { void somefunction();//definition of function is in .cpp file }
//EXE project int main() { DLL::somefunction(); }
main.obj : error LNK2001: unresolved external symbol "void __cdecl DLL::somefunction()"....