tidy - cppcoreguidelines-slicing — Extra Clang Tools 22.0.0git documentation (original) (raw)

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.63and C.145from the C++ Core Guidelines.