Visualizing Rust's Vtables: How dyn Trait Works In Memory

The article explains Rust’s runtime polymorphism using dyn Trait, illustrating the vtable layout and contrasting it with C++ virtual functions and CRTP. It details how static dispatch via generics monomorphizes code into separate functions per type, whereas dyn Trait uses a fat pointer holding a data address and a vtable pointer for runtime method resolution. Concrete Rust examples and a GitHub repository with the experimental code are included.