Trait core::iter::MultiplicativeIteratorUnstable

pub trait MultiplicativeIterator<A> {
    fn product(self) -> A;
}

A trait for iterators over elements which can be multiplied together.

Required Methods

fn product(self) -> A

Iterates over the entire iterator, multiplying all the elements

Example

fn main() { use std::iter::{count, MultiplicativeIterator}; fn factorial(n: uint) -> uint { count(1u, 1).take_while(|&i| i <= n).product() } assert!(factorial(0) == 1); assert!(factorial(1) == 1); assert!(factorial(5) == 120); }

use std::iter::{count, MultiplicativeIterator};

fn factorial(n: uint) -> uint {
    count(1u, 1).take_while(|&i| i <= n).product()
}
assert!(factorial(0) == 1);
assert!(factorial(1) == 1);
assert!(factorial(5) == 120);

Implementors

• impl<T: Iterator<Item=i8>> MultiplicativeIterator<i8> for T
• impl<T: Iterator<Item=i16>> MultiplicativeIterator<i16> for T
• impl<T: Iterator<Item=i32>> MultiplicativeIterator<i32> for T
• impl<T: Iterator<Item=i64>> MultiplicativeIterator<i64> for T
• impl<T: Iterator<Item=isize>> MultiplicativeIterator<isize> for T
• impl<T: Iterator<Item=u8>> MultiplicativeIterator<u8> for T
• impl<T: Iterator<Item=u16>> MultiplicativeIterator<u16> for T
• impl<T: Iterator<Item=u32>> MultiplicativeIterator<u32> for T
• impl<T: Iterator<Item=u64>> MultiplicativeIterator<u64> for T
• impl<T: Iterator<Item=usize>> MultiplicativeIterator<usize> for T
• impl<T: Iterator<Item=f32>> MultiplicativeIterator<f32> for T
• impl<T: Iterator<Item=f64>> MultiplicativeIterator<f64> for T