Rust Concept Clarification: Deref vs AsRef vs Borrow vs Cow

• wasm-bindgen

  44 7,270 9.2 Rust

  Facilitating high-level interactions between Wasm modules and JavaScript

  

The wasm-bindgen library contains a component called web-sys.

• http-types

  3 199 0.0 Rust

  Common types for HTTP operations

  

Another example of using AsRef is the http-types library, which uses AsRef and AsMut to convert various types.

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• api-guidelines

  32 1,198 3.3

  Rust API guidelines (by rust-lang)

  

std::convert::AsRef . As you can see, AsRef is grouped under the convert module. if you look at the documentation, you will see that traits related to type conversions are defined in this module. For example, the familiar "From/To", "TryFrom/TryTo" and "AsRef/AsMut" also appear in pairs here, indicating that the feature is releated to type conversions. Based on the naming rules in the Rust API Guidelines , wen can infer that methods starting with as_ represent conversions from borrow -> borrow, i.e, reference -> reference , and are overhead-free. And such conversions do not fail.

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