Trait safecast::TryCastInto

pub trait TryCastInto<T>: Sized {
    pub fn can_cast_into(&self) -> bool;
    pub fn opt_cast_into(self) -> Option<T>;

    pub fn try_cast_into<Err, OnErr: FnOnce(&Self) -> Err>(
        self, 
        on_err: OnErr
    ) -> Result<T, Err> { ... }
}

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

pub fn can_cast_into(&self) -> bool

Test if self can be cast into T.

pub fn opt_cast_into(self) -> Option<T>

Returns Some(T) if self can be cast into T, otherwise None.

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Provided methods

pub 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.

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Implementors

impl<F, T: TryCastFrom<F>> TryCastInto<T> for F

pub fn can_cast_into(&self) -> bool

pub fn opt_cast_into(self) -> Option<T>

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