Trait sp_runtime::traits::CheckedSub

pub trait CheckedSub: Sized + Sub<Self, Output = Self> {
    fn checked_sub(&self, v: &Self) -> Option<Self>;
}

Performs subtraction that returns None instead of wrapping around on underflow.

Required Methods

fn checked_sub(&self, v: &Self) -> Option<Self>

Subtracts two numbers, checking for underflow. If underflow happens, None is returned.

Implementations on Foreign Types

impl<T> CheckedSub for Ratio<T>where
    T: Clone + Integer + CheckedMul + CheckedSub,

fn checked_sub(&self, rhs: &Ratio<T>) -> Option<Ratio<T>>

impl CheckedSub for BigInt

fn checked_sub(&self, v: &BigInt) -> Option<BigInt>

impl CheckedSub for BigUint

fn checked_sub(&self, v: &BigUint) -> Option<BigUint>

impl CheckedSub for isize

fn checked_sub(&self, v: &isize) -> Option<isize>

impl CheckedSub for i32

fn checked_sub(&self, v: &i32) -> Option<i32>

impl CheckedSub for u8

fn checked_sub(&self, v: &u8) -> Option<u8>

impl CheckedSub for u32

fn checked_sub(&self, v: &u32) -> Option<u32>

impl CheckedSub for i8

fn checked_sub(&self, v: &i8) -> Option<i8>

impl CheckedSub for i64

fn checked_sub(&self, v: &i64) -> Option<i64>

impl CheckedSub for u128

fn checked_sub(&self, v: &u128) -> Option<u128>

impl CheckedSub for usize

fn checked_sub(&self, v: &usize) -> Option<usize>

impl CheckedSub for u16

fn checked_sub(&self, v: &u16) -> Option<u16>

impl CheckedSub for u64

fn checked_sub(&self, v: &u64) -> Option<u64>

impl CheckedSub for i128

fn checked_sub(&self, v: &i128) -> Option<i128>

impl CheckedSub for i16

fn checked_sub(&self, v: &i16) -> Option<i16>

impl CheckedSub for FixedU64

fn checked_sub(&self, rhs: &FixedU64) -> Option<FixedU64>

Implementors

impl CheckedSub for FixedI64

impl CheckedSub for FixedI128

impl CheckedSub for FixedU128

impl CheckedSub for PerU16

impl CheckedSub for Perbill

impl CheckedSub for Percent

impl CheckedSub for Permill

impl CheckedSub for Perquintill