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.. title:: clang-tidy - cppcoreguidelines-slicing
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:
.. code-block:: c++
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.
See the relevant C++ Core Guidelines sections for details:
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es63-dont-slice
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c145-access-polymorphic-objects-through-pointers-and-references
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