Trait safecast::TryCastInto
source · [−]pub trait TryCastInto<T>: Sized {
fn can_cast_into(&self) -> bool;
fn opt_cast_into(self) -> Option<T>;
fn try_cast_into<Err, OnErr: FnOnce(&Self) -> Err>(
self,
on_err: OnErr
) -> Result<T, Err> { ... }
}Expand description
Trait for defining a cast operation when the destination type cannot always be cast from the
source type. Defines a can_cast_into method which borrows self, allowing for pattern
matching without moving self. If can_cast_into returns true, then calling
opt_cast_into must return Some(...), otherwise try_cast_into may panic.
Analogous to TryFrom.
The inverse of TryCastInto.
Prefer implementing TryCastFrom over TryCastInto because implementing TryCastFrom
automatically provides an implementation of TryCastInto.
Required Methods
sourcefn can_cast_into(&self) -> bool
fn can_cast_into(&self) -> bool
Test if self can be cast into T.
sourcefn opt_cast_into(self) -> Option<T>
fn opt_cast_into(self) -> Option<T>
Returns Some(T) if self can be cast into T, otherwise None.
Provided Methods
sourcefn try_cast_into<Err, OnErr: FnOnce(&Self) -> Err>(
self,
on_err: OnErr
) -> Result<T, Err>
fn try_cast_into<Err, OnErr: FnOnce(&Self) -> Err>(
self,
on_err: OnErr
) -> Result<T, Err>
Returns Ok(T) if self can be cast into T, otherwise calls on_err.