Created
April 7, 2016 14:02
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Monoid implementation in Rust
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| trait Empty { | |
| fn empty() -> Self; | |
| } | |
| trait Semigroup { | |
| fn append(&self, other: Self) -> Self; | |
| } | |
| trait Monoid : Semigroup+Empty {} | |
| impl Empty for i32 { | |
| fn empty() -> i32 { 0 } | |
| } | |
| impl Semigroup for i32 { | |
| fn append(&self, other: i32) -> i32 { self + other } | |
| } | |
| impl Monoid for i32 {} | |
| fn sum<T: Semigroup>(a: T, b: T) -> T { a.append(b) } | |
| fn main() { | |
| println!("1 + 1 = {}", sum(1, 1)); | |
| } |
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