no appropriate default constructor available

[xarzu]

What causes the

no appropriate default constructor available

linker error

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

[Banfa]

I default constructor is one that can be called without any parameters.

If you provide no constructor the compiler provides a default constructor for you.

However if you provide a constructor and thats parameters then the compiler does not provide a default constructor for you, additionally if at least 1 of those parameters does not have a default value then there is no default constructor for the class.

Sometimes it is necessary to have a default constructor, for instance if you create a list using that class and the type.

[RRick]

Your second line describing the appropriate contstructor error sounds like a compiler error but your 3rd line says its a linker error.

My guess is that you have declared the constructor in the header, but you forgot to define the body of the constructor else where. This allows your code to compile but causes the dreaded "undefined external" linker error.