Trait option_operations::sub::OptionOverflowingSub

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

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

Trait for values and Options overflowing substraction.

Implementing this trait leads to the following auto-implementations:

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

Note that since the std library doesn’t define any OverflowingSub trait, users must provide the base implementation for the inner type.

Required Associated Types

type Output

The resulting inner type after applying the substraction.

Required Methods

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

Returns a tuple of the substraction along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then self is returned.

Returns None if at least one argument is None.

Implementations on Foreign Types

impl OptionOverflowingSub for i8

type Output = i8

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for i16

type Output = i16

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for i32

type Output = i32

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for i64

type Output = i64

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for i128

type Output = i128

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for u8

type Output = u8

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for u16

type Output = u16

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for u32

type Output = u32

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for u64

type Output = u64

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

impl OptionOverflowingSub for u128

type Output = u128

fn opt_overflowing_sub(self, rhs: Self) -> Option<(Self::Output, bool)>

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

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

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

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

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

where T: OptionOperations + OptionOverflowingSub<InnerRhs>,

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

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

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

where T: OptionOperations + OptionOverflowingSub<Rhs>,

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

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

Implementors

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

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

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

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

where T: OptionOperations + OptionOverflowingSub<InnerRhs>,

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