Can Rust Have Zero-Cost Dependency Injection?

Overview This article explores whether dependency injection (DI) can exist in Rust without sacrificing the language’s core philosophy of zero-cost abstractions. We will approach the question from three angles: Why dependency injection still matters in Rust, even for systems built with zero-sized types and compile-time guarantees. How DI evolved in other ecosystems, using Java as a reference point. A practical Rust-oriented approach to implementing DI with compile-time guarantees. “We’ll also show how Rust traits enable DI patterns that scale across crates, preserving zero-cost guarantees.” All Rust source code used in this article is available in the repository: https://github.com/amidukr/rust-dependency-injection-example Rust DI The Problem Rust Hasn’t Solved Yet Rust has solved problems most languages haven’t even dared to touch: memory safety without a garbage collector, fearless concurrency, and powerful zero-cost abstractions. But there is a class of problems Rust hasn’t fully con