“No appropriate default constructor available”--Why is the default constructor even called?

Question

I\'ve looked at a few other questions about this, but I don\'t see why a default constructor should even be called in my case. I could just provide a default constructor, bu

Answer 1

Member initialization occurs when the constructor begins. If you do not provide an initializer in the constructor's member initialization list, the member will be default constructed. If you want to copy constructor to be used to initialize the member cube, use the member initialization list:

ProxyPiece::ProxyPiece(CubeGeometry& c)
  : cube(c)
{ }

Everything following the colon is the initialization list. This simply says that cube should be initialized with c.

As you had it, the cube member was first default initialized and then c was copy assigned to it.