2023年11月25日 · The vTable, or Virtual Table, is a table of function pointers that is created by the compiler to support dynamic polymorphism. Whenever a class contains a virtual function, the compiler creates a Vtable for that class.

2024年12月7日 · The virtual table is a lookup table of functions used to resolve function calls in a dynamic/late binding manner. The virtual table sometimes goes by other names, such as “vtable”, “virtual function table”, “virtual method table”, or “dispatch table”. In C++, virtual function resolution is sometimes called dynamic dispatch.

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.

In computer programming, a virtual method table (VMT), virtual function table, virtual call table, dispatch table, vtable, or vftable is a mechanism used in a programming language to support dynamic dispatch (or run-time method binding).

2014年11月5日 · Whenever a program has a virtual function declared, a v - table is constructed for the class. The v-table consists of addresses to the virtual functions for classes that contain one or more virtual functions.

Virtual tables in C++ is an implementation detail. One possible implementation is shown on the diagram below. Two instances of the class (A and B) exists. Each instance has two vtbl pointers and the vtbl contains pointers to actual code.

2017年6月10日 · The vtable contains an entry for each virtual function accessible by the class and stores a pointer to its definition. Only the most specific function definition callable by the class is stored in the vtable.

2023年7月17日 · Introduction The C++ virtual table is the fundamental building block for C++ runtime polymorphisms. A virtual table (vtable) is a table of information used to dispatch virtual functions, to access virtual base class subobjects, and to access information for runtime type identification (RTTI).

2024年7月7日 · vtable: A vtable is essentially C++’s implementation of polymorphism. A vtable contains an array of pointers to virtual functions. Each class that has virtual functions (or inherits from a class with virtual functions) has its own vtable. vptr: Each object of such a class contains a pointer (usually referred to as vptr) to the vtable of its class.

In this mini post-series we’ll explore how clang implements vtables & RTTI. In this part we’ll start with some basic classes and later on cover multiple inheritance and virtual inheritance. Please note that this mini-series will include some digging into the binary generated for our different pieces of code via gdb.