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Trait frame_support::pallet_prelude::CheckedSub

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

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

Required Methods§

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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§

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impl CheckedSub for i8

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

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impl CheckedSub for i16

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

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impl CheckedSub for i32

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

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impl CheckedSub for i64

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

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impl CheckedSub for i128

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

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impl CheckedSub for isize

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impl CheckedSub for u8

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

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impl CheckedSub for u16

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

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impl CheckedSub for u32

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

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impl CheckedSub for u64

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

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impl CheckedSub for u128

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

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impl CheckedSub for usize

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impl CheckedSub for FixedI64

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impl CheckedSub for FixedI128

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impl CheckedSub for FixedU64

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impl CheckedSub for FixedU128

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impl CheckedSub for PerU16

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impl CheckedSub for Perbill

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impl CheckedSub for Percent

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impl CheckedSub for Permill

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impl CheckedSub for Perquintill

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impl CheckedSub for BigInt

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impl CheckedSub for BigUint

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impl CheckedSub for U128

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

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impl CheckedSub for U128

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

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impl CheckedSub for U256

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

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impl CheckedSub for U256

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

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impl CheckedSub for U512

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

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impl CheckedSub for U512

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

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impl<T, D> CheckedSub for TypeWithDefault<T, D>
where T: CheckedSub, D: Get<T>,

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

Implementors§