plasma-amm-state 0.1.0

Plasma AMM state
Documentation 
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use errors::PlasmaStateError;

pub mod amm;
pub mod errors;
pub mod fixed;
pub mod lp;

pub type SlotWindow = u64;

/// Private trait for safely downcasting between types
pub(crate) trait Downcast<To> {
    fn downcast(&self) -> Result<To, PlasmaStateError>;
}

impl Downcast<u64> for u128 {
    fn downcast(&self) -> Result<u64, PlasmaStateError> {
        if *self > u64::MAX as u128 {
            Err(PlasmaStateError::Overflow)
        } else {
            Ok(*self as u64)
        }
    }
}

/// Private trait for upcasting a larger integer type
pub(crate) trait Upcast<To> {
    fn upcast(&self) -> To;
}

impl Upcast<u128> for u64 {
    fn upcast(&self) -> u128 {
        *self as u128
    }
}

impl Upcast<u128> for u32 {
    fn upcast(&self) -> u128 {
        *self as u128
    }
}