Rust implementation of the Casey's Muratori example from the "Clean" Code, Horrible Performance article
Although the first benchmark with VTBL is unstable (it varies from 2.8 ms to ~600 µs), the following picture looks like this:
GS (General Struct)
Benchmark uses the array of 400 000 structs in a for-loop
| Method | Time | Difference from baseline |
|---|---|---|
| Dynamic dispatch | 632.34 µs | 100% |
| GS with enum field + match | 379.52 µs | 60.01% |
| GS with enum field + match + lookup table | 340.19 µs | 53.79% |
| Rust enums | 366.25 µs | 57.91% |
It is worth noting that both trait methods and pure methods have the same performance whith the static dispatch, so I deleted one of the benchmarks