Rust doesn’t support default function arguments. Or does it?

• abi_stable_crates

  7 491 4.9 Rust

  Rust-to-Rust ffi,ffi-safe equivalents of std types,and creating libraries loaded at startup.

Here’s abi_stable_crates, enabling Rust API to be exported with a stable ABI

• rust

  2,684 93,266 10.0 Rust

  Empowering everyone to build reliable and efficient software.

  

Indeed there's an open issue about changing the mangling: https://github.com/rust-lang/rust/issues/60705 . The current proposal has this phrase:

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• rfcs

  1 0 0.0

  RFCs for changes to Rust (by michaelwoerister)

Indeed there's an open issue about changing the mangling: https://github.com/rust-lang/rust/issues/60705 . The current proposal has this phrase:

• rust-default-arguments-benchmark

  1 0 2.6 Rust

  A simple benchmark to evaluate the performance impact of using structs that implement Default as function arguments.

I've added the builder pattern to my benchmark. The results were that the 3 implementations were indistinguishable when function inlining was allowed. When inlining was not allowed, both the default trait pattern and the builder pattern suffered similar performance penalties (maybe those penalties are actually associated to having a struct as argument?).

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