Trait CheckedCastFrom

pub trait CheckedCastFrom<Src>: Sized {
    // Required method
    fn checked_cast_from(src: Src) -> Option<Self>;
}

Used for checked casts.

This trait enables trait constraints for casting in the opposite direction to CheckedCast.

Examples

use az::CheckedCastFrom;
trait Tr {
    type Assoc: CheckedCastFrom<u8>;
    fn checked_assoc_from_u8(a: u8) -> Option<Self::Assoc> {
        CheckedCastFrom::checked_cast_from(a)
    }
}
impl Tr for () {
    type Assoc = i8;
}
assert_eq!(<() as Tr>::checked_assoc_from_u8(5u8), Some(5i8));
assert_eq!(<() as Tr>::checked_assoc_from_u8(255u8), None);

Required Methods

fn checked_cast_from(src: Src) -> Option<Self>

Casts the value.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<Src: CheckedCast<Dst>, Dst> CheckedCastFrom<Src> for Dst