Struct glib::char::Char [−][src]
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());
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Char
impl UnwindSafe for Char
Blanket Implementations
Mutably borrows from an owned value. Read more