История

Andreas Tolfsen 9a7861a87e Bug 1413292 - Drop backtrace et al. vendored crates. r=jgraham MozReview-Commit-ID: Gq8APbKeuZx --HG-- extra : rebase_source : a0dc2ad0f84eca3da05f12368af2332b1426f30f		2017-10-31 20:31:08 +00:00
..
src	Bug 1413292 - Drop backtrace et al. vendored crates. r=jgraham	2017-10-31 20:31:08 +00:00
tests	…
.cargo-checksum.json	Bug 1413292 - Drop backtrace et al. vendored crates. r=jgraham	2017-10-31 20:31:08 +00:00
.travis.yml	Bug 1277338 - Part 13: Update vendored crates for newer `js` crate; r=sfink	2017-09-05 09:26:22 -07:00
Cargo.toml	Bug 1413292 - Drop backtrace et al. vendored crates. r=jgraham	2017-10-31 20:31:08 +00:00
LICENSE-APACHE	Bug 1277338 - Part 13: Update vendored crates for newer `js` crate; r=sfink	2017-09-05 09:26:22 -07:00
LICENSE-MIT	Bug 1277338 - Part 13: Update vendored crates for newer `js` crate; r=sfink	2017-09-05 09:26:22 -07:00
README.md	…

README.md

cfg-if

Documentation

A macro to ergonomically define an item depending on a large number of #[cfg] parameters. Structured like an if-else chain, the first matching branch is the item that gets emitted.

[dependencies]
cfg-if = "0.1"

Example

#[macro_use]
extern crate cfg_if;

cfg_if! {
    if #[cfg(unix)] {
        fn foo() { /* unix specific functionality */ }
    } else if #[cfg(target_pointer_width = "32")] {
        fn foo() { /* non-unix, 32-bit functionality */ }
    } else {
        fn foo() { /* fallback implementation */ }
    }
}

fn main() {
    foo();
}

License

cfg-if is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, and LICENSE-MIT for details.