cppcoreguidelines-slicing¶
Flags slicing of member variables or vtable. Slicing happens when copying a derived object into a base object: the members of the derived object (both member variables and virtual member functions) will be discarded. This can be misleading especially for member function slicing, for example:
struct B { int a; virtual int f(); };
struct D : B { int b; int f() override; };
void use(B b) { // Missing reference, intended?
b.f(); // Calls B::f.
}
D d;
use(d); // Slice.
This check implements ES.63 and C.145 from the C++ Core Guidelines.