const-ft

A macro for easy generation and wrapping of a const function under a const_fn feature gate.

Installation:

 const-ft = { version =  "0.1" }

You can enable the feature by having a feature in the project enable the feature from the crate:

[features]
const = ["const-ft/const_fn"]

Usage:

const_ft! {
      pub fn some_function() -> usize {
         1usize
}

Requirement:

By using the macro, your code changes from

#![cfg_attr(feature = "const_fn", feature(const_fn))]

     #[cfg(feature = "const_fn")]
     pub const fn some_function() -> usize {
         1usize
     }
 
     #[cfg(not(feature = "const_fn"))]
     pub fn some_function() -> usize {
        1usize
     }

to

#![cfg_attr(feature = "const_fn", feature(const_fn))]

 #[macro_use]
 extern crate const_ft;

 const_ft! {
      pub fn some_function() -> usize {
         1usize
      }
 }