Trait frame_support::weights::WeightToFeePolynomial[][src]

pub trait WeightToFeePolynomial {
    type Balance: BaseArithmetic + From<u32> + Copy + Unsigned;
    fn polynomial() -> WeightToFeeCoefficients<Self::Balance>;

    fn calc(weight: &Weight) -> Self::Balance { ... }
Expand description

A trait that describes the weight to fee calculation as polynomial.

An implementor should only implement the polynomial function.

Associated Types

The type that is returned as result from polynomial evaluation.

Required methods

Returns a polynomial that describes the weight to fee conversion.

This is the only function that should be manually implemented. Please note that all calculation is done in the probably unsigned Balance type. This means that the order of coefficients is important as putting the negative coefficients first will most likely saturate the result to zero mid evaluation.

Provided methods

Calculates the fee from the passed weight according to the polynomial.

This should not be overriden in most circumstances. Calculation is done in the Balance type and never overflows. All evaluation is saturating.