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c++headerlnk2019

calling a function defined in a header file from a Class constructor in C++

I have a header file, let's call it header1.h with the definition of a function, let's say myFunc() in it. My C++ project has a source file, let's call it main.cpp and a header file main.h. I have included header1.h in the main.h and then included main.h in main.cpp.

In the main.cpp I have a class constructor let's call it MyClass and I have this code:

MyClass:MyClass(...)
.
.
{
  .
  .
  f = myFunc(...);
  .
}

when I compile the code I get this error:

error LNK2019: unresolved external symbol _myFunc referenced in function

What is the reason for this error?

Solution

  • That is a linker error. The file which contains the definition of myFunc is not being compiled, or you are not linking to the library which exported it.