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MIT - MIT License
Provides a macro to simplify operator overloading. See the documentation for details and supported operators.
extern crate overload;
use overload::overload;
#[derive(PartialEq, Debug)]
struct Val {
v: i32
}
overload!((a: ?Val) + (b: ?Val) -> Val { Val { v: a.v + b.v } });The macro call in the snippet above generates the following code:
impl std::ops::Add<Val> for Val {
type Output = Val;
fn add(self, b: Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl std::ops::Add<&Val> for Val {
type Output = Val;
fn add(self, b: &Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl std::ops::Add<Val> for &Val {
type Output = Val;
fn add(self, b: Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl std::ops::Add<&Val> for &Val {
type Output = Val;
fn add(self, b: &Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}We are now able to add Vals and &Vals in any combination:
assert_eq!(Val{v:3} + Val{v:5}, Val{v:8});
assert_eq!(Val{v:3} + &Val{v:5}, Val{v:8});
assert_eq!(&Val{v:3} + Val{v:5}, Val{v:8});
assert_eq!(&Val{v:3} + &Val{v:5}, Val{v:8});