Crate macro_const

Creates corresponding macro definitions for constants, allowing the value of the constants to be used in the context of other macros.

Examples

macro_const! {
    const FILE: &str = "message.txt";
}

println!("Contents: {}", include_str!(FILE!()));
println!("File: {}", FILE);

Doc comments can be added as well. The documentation for the constant will be added to the generated macro verbatim. To export the generated macro, simply add the #[macro_export] attribute to the constant definition.

macro_const! {
    /// The API base URL.
    #[macro_export]
    pub const BASE_URL: &str = "https://myapi.io/";

    /// The current supported API version.
    pub const API_VERSION: &str = "v1";
}

assert_eq!("https://myapi.io/v1", concat!(BASE_URL!(), API_VERSION!()));

Macros

macro_const

Generates corresponding macros for constants that evaluate to the same values as the constants.