Trait AssignmentCost 

pub trait AssignmentCost: FiniteCost {
    // Required method
    fn checked_sub(&self, rhs: &Self) -> Option<Self>;
}

Additive, ordered cost used by certified assignment.

Assignment needs checked addition for totals and checked subtraction for min-cost-flow residual edges and dual certificates. Implementations must provide exact arithmetic: saturating or wrapping implementations violate the certificate contract.

Required Methods

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

Exact checked subtraction.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl AssignmentCost for f32

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

impl AssignmentCost for f64

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

impl AssignmentCost for i32

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

impl AssignmentCost for i64

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

impl AssignmentCost for i128

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

impl AssignmentCost for isize

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

Implementors