Static dispatch over Write with generics in Rust
WHAT IT TESTS: static vs dynamic dispatch trade-offs. OUTLINE: write generically over the std::io::Write trait with a type parameter W: Write, letting the compiler monomorphize and inline per concrete type, avoiding the vtable indirection of Box<dyn Write>.
WHAT IT TESTS: choosing static dispatch via generics over dynamic dispatch via trait objects. ANSWER OUTLINE: abstract over the std::io::Write trait. Make your component generic, struct Writer<W: Write> or fn emit<W: Write>(w: &mut W), so each concrete destination, stdout, File, TcpStream, instantiates a specialized version through monomorphization. The compiler can inline and optimize, eliminating the vtable lookup that Box<dyn Write> incurs. Trade-off is code bloat and loss of runtime heterogeneity.
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- #rust
- #traits
- #generics
- #static-dispatch
- #io
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