Struct Char

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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.to_glib().

Tuple Fields§

§0: c_char

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impl Char

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pub fn new(c: char) -> Option<Char>

Creates a Some(Char) if the given char is representable as an libc::c_char

§Example
extern "C" fn have_a_byte(b: libc::c_char);

let a = Char::new('a').unwrap();
assert!(a.0 == 65);
have_a_byte(a.to_glib());

let not_representable = Char::new('☔');
assert!(not_representable.is_none());

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impl Clone for Char

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fn clone(&self) -> Char

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Char

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl From<Char> for char

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fn from(c: Char) -> char

Converts to this type from the input type.
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impl PartialEq for Char

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fn eq(&self, other: &Char) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for Char

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impl Eq for Char

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impl StructuralPartialEq for Char

Auto Trait Implementations§

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impl Freeze for Char

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impl RefUnwindSafe for Char

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impl Send for Char

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impl Sync for Char

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impl Unpin for Char

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impl UnwindSafe for Char

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.