Trait nom::lib::std::ops::Neg 1.0.0
[−]
[src]
#[lang = "neg"]pub trait Neg { type Output; fn neg(self) -> Self::Output; }
The unary negation operator -.
Examples
An implementation of Neg for Sign, which allows the use of - to
negate its value.
use std::ops::Neg; #[derive(Debug, PartialEq)] enum Sign { Negative, Zero, Positive, } impl Neg for Sign { type Output = Sign; fn neg(self) -> Sign { match self { Sign::Negative => Sign::Positive, Sign::Zero => Sign::Zero, Sign::Positive => Sign::Negative, } } } // A negative positive is a negative. assert_eq!(-Sign::Positive, Sign::Negative); // A double negative is a positive. assert_eq!(-Sign::Negative, Sign::Positive); // Zero is its own negation. assert_eq!(-Sign::Zero, Sign::Zero);
Associated Types
type Output
The resulting type after applying the - operator.