This technical article provides an in-depth explanation of how virtual tables (vtables) are implemented in the Itanium C++ ABI, which is used by most C++ compilers except Microsoft's MSVC. It demonstrates with code examples how the compiler generates vtables to enable runtime polymorphism and includes practical instructions for examining vtable layouts using GCC and Clang compiler flags.
Background
Virtual functions are a fundamental feature of C++ that enable runtime polymorphism, but their implementation details are often abstracted away from developers. The Itanium C++ ABI is the de facto standard for C++ implementation on most Unix-like systems.
- Source
- Lobsters
- Published
- May 26, 2026 at 08:32 PM
- Score
- 7.0 / 10