What is vtable in C++

V-tables (or virtual tables) are how most C++ implementations do polymorphism. For each concrete implementation of a class, there is a table of function pointers to all the virtual methods. A pointer to this table (called the virtual table) exists as a data member in all the objects. When one calls a virtual method, we lookup the object's v-table and call the appropriate derived class method.

vTable (virtual table) is an implementation detail of dynamic dispatch (virtual methods).

See C++-Lite-Faq for more details.