Trait frame_support::pallet_prelude::CheckedSub

pub trait CheckedSub: Sized + Sub<Output = Self> {
    // Required method
    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.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl CheckedSub for i8

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

impl CheckedSub for i16

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

impl CheckedSub for i32

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

impl CheckedSub for i64

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

impl CheckedSub for i128

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

impl CheckedSub for isize

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

impl CheckedSub for u8

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

impl CheckedSub for u16

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

impl CheckedSub for u32

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

impl CheckedSub for u64

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

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 FixedI64

fn checked_sub(&self, rhs: &FixedI64) -> Option<FixedI64>

impl CheckedSub for FixedI128

fn checked_sub(&self, rhs: &FixedI128) -> Option<FixedI128>

impl CheckedSub for FixedU64

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

impl CheckedSub for FixedU128

fn checked_sub(&self, rhs: &FixedU128) -> Option<FixedU128>

impl CheckedSub for PerU16

fn checked_sub(&self, v: &PerU16) -> Option<PerU16>

impl CheckedSub for Perbill

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

impl CheckedSub for Percent

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

impl CheckedSub for Permill

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

impl CheckedSub for Perquintill

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

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 U128

fn checked_sub(&self, v: &U128) -> Option<U128>

impl CheckedSub for U128

fn checked_sub(&self, v: &U128) -> Option<U128>

impl CheckedSub for U256

fn checked_sub(&self, v: &U256) -> Option<U256>

impl CheckedSub for U256

fn checked_sub(&self, v: &U256) -> Option<U256>

impl CheckedSub for U512

fn checked_sub(&self, v: &U512) -> Option<U512>

impl CheckedSub for U512

fn checked_sub(&self, v: &U512) -> Option<U512>

impl<T, D> CheckedSub for TypeWithDefault<T, D>

where T: CheckedSub, D: Get<T>,

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

Implementors

impl CheckedSub for Weight