tinystr/
macros.rs

1// This file is part of ICU4X. For terms of use, please see the file
2// called LICENSE at the top level of the ICU4X source tree
3// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
4
5#[macro_export]
6macro_rules! tinystr {
7    ($n:literal, $s:literal) => {{
8        // Force it into a const context; otherwise it may get evaluated at runtime instead.
9        const TINYSTR_MACRO_CONST: $crate::TinyAsciiStr<$n> = {
10            match $crate::TinyAsciiStr::try_from_utf8($s.as_bytes()) {
11                Ok(s) => s,
12                // Cannot format the error since formatting isn't const yet
13                Err(_) => panic!(concat!("Failed to construct tinystr from ", $s)),
14            }
15        };
16        TINYSTR_MACRO_CONST
17    }};
18}
19
20#[cfg(test)]
21mod tests {
22    #[test]
23    fn test_macro_construction() {
24        let s1 = tinystr!(8, "foobar");
25        assert_eq!(&*s1, "foobar");
26
27        let s1 = tinystr!(12, "foobarbaz");
28        assert_eq!(&*s1, "foobarbaz");
29    }
30}
tinystr/macros.rs

tinystr/
macros.rs
