pub struct Char(pub c_char);Expand description
Wrapper for values where C functions expect a plain C char
Consider the following C function prototype from glib:
void g_key_file_set_list_separator (GKeyFile *key_file, gchar separator);
This function plainly expects a byte as the separator argument. However,
having this function exposed to Rust as the following would be inconvenient:
impl KeyFile {
pub fn set_list_separator(&self, separator: libc:c_char) { }
}This would be inconvenient because users would have to do the conversion from a Rust char to an libc::c_char by hand, which is just a type alias
for i8 on most system.
This Char type is a wrapper over an libc::c_char, so that we can pass it to Glib or C functions.
The check for whether a Rust char (a Unicode scalar value) actually fits in a libc::c_char is
done in the new function; see its documentation for details.
The inner libc::c_char (which is equivalent to i8) can be extracted with .0, or
by calling my_char.into_glib().
Examples
use glib::Char;
use std::convert::TryFrom;
Char::from(b'a');
Char::try_from('a').unwrap();
assert!(Char::try_from('☔').is_err());extern "C" fn have_a_byte(b: libc::c_char);
have_a_byte(Char::from(b'a').into_glib());Tuple Fields§
§0: c_char