Trait option_operations::sub::OptionSub

pub trait OptionSub<Rhs = Self, InnerRhs = Rhs> {
    type Output;

    // Required method
    fn opt_sub(self, rhs: Rhs) -> Option<Self::Output>;
}

Trait for values and Options substraction.

Implementing this trait leads to the following auto-implementations:

• OptionSub<Option<InnerRhs>> for T.
• OptionSub<Rhs> for Option<T>.
• OptionSub<Option<InnerRhs>> for Option<T>.
• … and some variants with references.

This trait is auto-implemented for OptionOperations types implementing Sub<Rhs>.

Required Associated Types

type Output

The resulting inner type after applying the substraction.

Required Methods

fn opt_sub(self, rhs: Rhs) -> Option<Self::Output>

Computes the substraction.

Returns None if at least one argument is None.

Implementations on Foreign Types

impl<T, InnerRhs> OptionSub<&Option<InnerRhs>, InnerRhs> for Option<T>

where T: OptionOperations + OptionSub<InnerRhs>, InnerRhs: Copy,

type Output = <T as OptionSub<InnerRhs>>::Output

fn opt_sub(self, rhs: &Option<InnerRhs>) -> Option<Self::Output>

impl<T, InnerRhs> OptionSub<Option<InnerRhs>, InnerRhs> for Option<T>

where T: OptionOperations + OptionSub<InnerRhs>,

type Output = <T as OptionSub<InnerRhs>>::Output

fn opt_sub(self, rhs: Option<InnerRhs>) -> Option<Self::Output>

impl<T, Rhs> OptionSub<Rhs> for Option<T>

where T: OptionOperations + OptionSub<Rhs>,

type Output = <T as OptionSub<Rhs>>::Output

fn opt_sub(self, rhs: Rhs) -> Option<Self::Output>

Implementors

impl<T, InnerRhs> OptionSub<&Option<InnerRhs>, InnerRhs> for T

where T: OptionOperations + OptionSub<InnerRhs>, InnerRhs: Copy,

type Output = <T as OptionSub<InnerRhs>>::Output

impl<T, InnerRhs> OptionSub<Option<InnerRhs>, InnerRhs> for T

where T: OptionOperations + OptionSub<InnerRhs>,

type Output = <T as OptionSub<InnerRhs>>::Output

impl<T, Rhs> OptionSub<Rhs> for T

where T: OptionOperations + Sub<Rhs>,

type Output = <T as Sub<Rhs>>::Output