collections::enum_set::CLike - Rust
Description: API documentation for the Rust `CLike` trait in crate `collections`.
Keywords: rust, rustlang, rust-lang, CLike

# Trait collections::enum_set::CLike [−] [src]

    pub trait CLike {
        fn to_usize(&self) -> usize;
        fn from_usize(_: usize) -> Self;
    }

Deprecated since 1.16.0

: long since replaced

🔬 This is a nightly-only experimental API. (`enumset` #37966)

matches collection reform specification, waiting for dust to settle

An interface for casting C-like enum to usize and back. A typically implementation is as below.

    #[repr(usize)]
    enum Foo {
        A, B, C
    }

    impl CLike for Foo {
        fn to_usize(&self) -> usize {
            *self as usize
        }

        fn from_usize(v: usize) -> Foo {
            unsafe { mem::transmute(v) }
        }
    }Run

## Required Methods

### `fn to_usize(&self) -> usize`

Deprecated since 1.16.0

: long since replaced

🔬 This is a nightly-only experimental API. (`enumset` #37966)

matches collection reform specification, waiting for dust to settle

Converts a C-like enum to a `usize`.

### `fn from_usize(_: usize) -> Self`

Deprecated since 1.16.0

: long since replaced

🔬 This is a nightly-only experimental API. (`enumset` #37966)

matches collection reform specification, waiting for dust to settle

Converts a `usize` to a C-like enum.

## Implementors

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