std::ffi::c_ushort — Rust type alias

What `c_ushort` does

c_ushort is a type alias exposed by the std::ffi module of the Rust standard library. It is part of the public, stable API and you can rely on it from any edition of Rust.

type c_ushort = ... introduces a new name for an existing type. The alias is purely a syntactic shortcut — it does not create a distinct type. Use c_ushort anywhere you would write the underlying type. The full canonical path is std::ffi::c_ushort; bring it into scope with use std::ffi::c_ushort; or refer to it by its full path.

When to use it

Use c_ushort as a shorter name for its underlying type. Type aliases do not create new types — they're purely for readability and future-proofing.

Annotated examples

Declaring values of type c_ushort

use std::ffi::c_ushort;

fn demo() {
    // c_ushort is a type alias — it desugars to its underlying type but
    // gives you a meaningful name to read and write. Type aliases do not
    // create new types; they're purely for readability.
    let value: c_ushort = Default::default();
    let _ = value;
}

Type aliases shorten verbose generic types in your own APIs (e.g. `type Result<T> = std::result::Result<T, MyError>;`) and give domain-specific names to common shapes.

For deeper background, see the canonical Rust patterns reference for the broader context behind this section.

Using c_ushort in a function signature

use std::ffi::c_ushort;

// A type alias makes the function signature self-documenting and lets
// you swap the underlying representation in one place if requirements
// change.
fn process(input: c_ushort) -> c_ushort {
    input
}

Aliases work in any position a regular type does — function arguments, return values, generic parameters. They're a cheap way to make code more readable.

Common pitfalls

A type alias is not a new type — it does not enforce different semantic intent. If you want the compiler to distinguish two different shapes that share the same underlying representation, use a newtype struct instead.

For deeper background, see an in-depth Rust idioms cheat sheet for the broader context behind this section.

Performance & threading notes

Pure compile-time. The alias is erased before code generation; the resulting binary is identical to one that uses the underlying type directly.

What c_ushort does