const-str 0.3.2

compile-time string operations
Documentation 
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pub struct ToByteArray<T>(pub T);

impl ToByteArray<&str> {
    pub const fn const_eval<const N: usize>(&self) -> [u8; N] {
        crate::bytes::clone(self.0.as_bytes())
    }
}

impl<const L: usize> ToByteArray<&[u8; L]> {
    pub const fn const_eval<const N: usize>(&self) -> [u8; N] {
        crate::bytes::clone(self.0)
    }
}

/// Converts a string slice or a byte string to a byte array.
///
/// # Examples
/// ```
/// const S: &str = "hello";
/// const B: &[u8; 6] = b"hello\0";
/// assert_eq!(const_str::to_byte_array!(S), [b'h', b'e', b'l', b'l', b'o']);
/// assert_eq!(const_str::to_byte_array!(B), [b'h', b'e', b'l', b'l', b'o', b'\0']);
/// ```
///
#[macro_export]
macro_rules! to_byte_array {
    ($s: expr) => {{
        const OUTPUT_LEN: usize = $crate::len!($s);
        $crate::__ctfe::ToByteArray($s).const_eval::<OUTPUT_LEN>()
    }};
}