#[const_fn]

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An attribute for easy generation of const functions with conditional compilations.

Usage

Add this to your Cargo.toml:

toml [dependencies] const_fn = "0.4"

The current const_fn requires Rust 1.31 or later.

Examples

```rust use constfn::constfn;

// function is const on specified version and later compiler (including beta and nightly)

[const_fn("1.36")]

pub const fn version() { /* ... */ }

// function is const on nightly compiler (including dev build)

[const_fn(nightly)]

pub const fn nightly() { /* ... */ }

// function is const if cfg(...) is true

[const_fn(cfg(...))]

pub const fn cfg() { /* ... */ }

// function is const if cfg(feature = "...") is true

[const_fn(feature = "...")]

pub const fn feature() { /* ... */ } ```

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.