#feature #macro #exclusive #mutually-exclusive #mutually

no-std mutually_exclusive_features

Macros to check that only none or one of a set of features is enabled at a time, as known as mutually exclusive features

1 unstable release

0.0.3 Nov 9, 2023
0.0.2 Nov 9, 2023
0.0.1 Nov 9, 2023

#306 in Rust patterns

Download history 500/week @ 2023-11-04 10426/week @ 2023-11-11 8941/week @ 2023-11-18 10176/week @ 2023-11-25

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Used in 35 crates (2 directly)

MIT/Apache

8KB

Macros to check mutually exclusive of features in Rust


It contains none_or_one_of and exactly_one_of macros.

Both check mutually exclusive of features in Rust, but none_or_one_of allows for no features to be enabled, while exactly_one_of requires exactly one feature to be enabled.

Usage


none_or_one_of


Call it with the list of features you want to be mutually exclusive:

use mutually_exclusive_features::none_or_one_of;
none_or_one_of!("feature1", "feature2", "feature3");

Which will generate the following code:

#[cfg(all(feature="feature1", feature="feature2"))]
compile_error!("The `feature1` and `feature2` features are mutually exclusive and cannot be enabled at the same time!");

#[cfg(all(feature="feature1", feature="feature3"))]
compile_error!("The `feature1` and `feature3` features are mutually exclusive and cannot be enabled at the same time!");

#[cfg(all(feature="feature2", feature="feature3"))]
compile_error!("The `feature2` and `feature3` features are mutually exclusive and cannot be enabled at the same time!");

exactly_one_of


It's the same, but requires exactly one feature to be enabled:

use mutually_exclusive_features::exactly_one_of;
exactly_one_of!("feature1", "feature2", "feature3");

Which will generate the following code:

#[cfg(all(feature="feature1", feature="feature2"))]
compile_error!("The `feature1` and `feature2` features are mutually exclusive and cannot be enabled at the same time!");

#[cfg(all(feature="feature1", feature="feature3"))]
compile_error!("The `feature1` and `feature3` features are mutually exclusive and cannot be enabled at the same time!");

#[cfg(all(feature="feature2", feature="feature3"))]
compile_error!("The `feature2` and `feature3` features are mutually exclusive and cannot be enabled at the same time!");

#[cfg(not(any(feature="feature1", feature="feature2", feature="feature3")))]
compile_error!("You must enable exactly one of `feature1`, `feature2`, `feature3` features!");

No runtime deps