no appropriate default constructor available

[Athanasopolous]

What causes the

no appropriate default constructor available

linker error

when I do have an constructor defined in the header file?

It is a link error

It is an unresolved external symbol for the constructor

LNK2019: unresolved external symbol "public: __thiscall CSomething::CSomething(class CSomethingelse *)



and yet in the header file I have the constructor set up for that as:

CSomething( CSomethingelse * psomethingelse)



Which is how it is used in the cpp file.

 

[cpjust]

If you declare it in the header file, you also need to implement it in the .cpp file, otherwise the linker can't find the code that goes with the constructor signature.