1 unstable release
Uses old Rust 2015
0.1.0 | Apr 2, 2019 |
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#684 in Rust patterns
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Used in 1,336 crates
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match_cfg
Minimum Supported Rust Version: 1.13.0.
A convenience macro to ergonomically define an item depending on a large number
of #[cfg]
parameters. Structured like match statement, the first matching
branch is the item that gets emitted.
[dependencies]
match_cfg = "0.1"
The use_core
feature is enabled by default and builds the crate with libcore
as a dependency by using the #![no_std]
attribute. When this feature is
disabled, this crate is built without libcore support by using the #![no_core]
attribute - this makes use of the #![feature(no_core)]
and requires a nightly
version of Rust.
Example
#[macro_use(match_cfg)]
extern crate match_cfg;
match_cfg! {
#[cfg(unix)] => {
fn foo() { /* unix specific functionality */ }
}
#[cfg(target_pointer_width = "32")] => {
fn foo() { /* non-unix, 32-bit functionality */ }
}
_ => {
fn foo() { /* fallback implementation */ }
}
}
fn main() {
foo();
}
License
This project is 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 Serde by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.