This error often means that some function has a declaration, but not a definition.
Example:
// A.hpp class A { public: void myFunc(); // Function declaration }; // A.cpp // Function definition void A::myFunc() { // do stuff }
In your case, the definition cannot be found. The issue could be that you are including a header file, which brings in some function declarations, but you either:
- do not define the functions in your cpp file (if you wrote this code yourself)
- do not include the lib/dll file that contains the definitions
A common mistake is that you define a function as a standalone and forget the class selector, e.g. A::
, in your .cpp file:
Wrong: void myFunc() { /* do stuff */ }
Right: void A::myFunc() { /* do stuff */ }
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