https://github.com/williamvenner/cfg_table

✨ A simple macro that expands to different values across compilation targets
https://github.com/williamvenner/cfg_table

cfg conditional-compilation conditional-compile macro rust

Last synced: 21 days ago
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✨ A simple macro that expands to different values across compilation targets

• Host: GitHub
• URL: https://github.com/williamvenner/cfg_table
• Owner: WilliamVenner
• License: mit
• Created: 2021-09-23T23:07:53.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-11-26T18:50:47.000Z (about 3 years ago)
• Last Synced: 2024-10-11T11:33:56.484Z (3 months ago)
• Topics: cfg, conditional-compilation, conditional-compile, macro, rust
• Language: Rust
• Homepage: https://crates.io/crates/cfg_table
• Size: 5.86 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
[![crates.io](https://img.shields.io/crates/v/cfg_table.svg)](https://crates.io/crates/cfg_table)

# ✨ `cfg_table`

A simple macro that expands to different values across compilation targets.

## Panics

This macro will panic at runtime if no matching value is found.

## Example

```rust

#[macro_use] extern crate cfg_table;

let var = cfg_table! {

    [all(target_os = "freebsd", target_pointer_width = "64", feature = "my-feature")] => 1337, // custom

    // common platforms

    win32 => 32,

    win64 => 64,

    linux32 => 32,

    linux64 => 64,

    macos32 => 32,

    macos64 => 64,

    // pointer widths

    32 => 1985,

    "32" => 1985,

    64 => 2003,

    "64" => 2003,

    _ => 123, // default value if nothing matches, this must be at the bottom

};

cfg_table! {

    win32 => {

        println!("You're on Windows 32-bit!");

    },

    win64 => {

        println!("You're on Windows 64-bit!");

    },

    _ => {

        panic!("What the heck is a \"Linux\"?");

    },

};

```