Macro riot_sys::cstr[][src]

macro_rules! cstr {
    ($e : expr) => { ... };
Expand description

Generate a CStr at compile time that is guaranteed to be correct. The given argument should be a string literal with no \0 bytes.

This macro validates at compile time that the given string does not contain \0 and automatically appends \0.

let str: &cstr_core::CStr = cstr_core::cstr!("Hello world!");
assert_eq!("Hello world!", str.to_str().unwrap());

note: if the string contains \0 bytes, the error looks like:

 error[E0080]: evaluation of constant value failed
 --> src/
4 | let str: &cstr_core::CStr = cstr_core::cstr!("Hello \0world!");
  |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attempt to compute `0_usize - 1_usize`, which would overflow
  = note: this error originates in the macro `cstr_core::cstr` (in Nightly builds, run with -Z macro-backtrace for more info)