qualifier_attr

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Procedural macro attributes for adding "qualifiers" to various items.

At the moment, the crate supports only functions and the following "qualifiers":

pub, pub(crate), ... - visibility qualifiers
async - async qualifier
unsafe - unsafe qualifier
const - const qualifier
extern "ABI" - ABI qualifier

Examples

```rust use qualifierattr::fnqualifiers;

// We can add a qualifier to a function // with an attribute.

[fn_qualifiers(const)]

fn const_fn() -> u32 { 42 }

const CONSTRES: u32 = constfn();

// It's not so impresive on its own // but with cfg_attr it can be conditional.

[cfgattr(feature = "externc", nomangle, fnqualifiers(pub, extern "C"))]

fn externcfn() -> u32 { 42 } ```

License

^{Licensed under either of Apache License, Version
2.0 or MIT license at your option.}

_{Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.}