C++ enforce conditions on inherited classes
- by user231536
I would like to define an abstract base class X and enforce the following:
a) every concrete class Y that inherits from X define a constructor Y(int x)
b) it should be possible to test whether two Y objects are equal.
For a, one not very good solution is to put a pure virtual fromInt method in X
which concrete class will have to define. But I cannot enforce construction.
For b), I cannot seem to use a pure virtual method in X
bool operator == (const X& other) const =0;
because in overridden classes this remains undefined. It is not enough to define
bool operator == (const Y& other) const { //stuff}
because the types don't match. How do I solve these problems?
