[RUST/COMMON] Iterator 트레잇 : take 메소드 사용하기

■ Iterator 트레잇의 take 메소드를 사용하는 방법을 보여준다.

▶ 예제 코드 (RS)


struct NumberIterator
{
    maximum : usize,
    value   : usize
}

impl NumberIterator
{
    fn new(minimum : usize, maximum : usize) -> Self
    {
        return NumberIterator
        {
            maximum : maximum,
            value   : minimum
        };
    }
}

impl Iterator for NumberIterator
{
    type Item = usize;

    fn next(&mut self) -> Option<Self::Item>
    {
        if self.value > self.maximum
        {
            return None;
        }

        self.value += 1;

        return Some(self.value - 1);
    }
}

fn main()
{
    let iterator : NumberIterator = NumberIterator::new(10, 19);

    for value in iterator.take(5)
    {
        println!("{}", value);
    }
}
/*
10
11
12
13
14
*/

struct NumberIterator

{

maximum : usize,

value : usize

}

impl NumberIterator

{

fn new(minimum : usize, maximum : usize) -> Self

{

return NumberIterator

{

maximum : maximum,

value : minimum

};

}

impl Iterator for NumberIterator

{

type Item = usize;

fn next(&mut self) -> Option<Self::Item>

{

if self.value > self.maximum

{

return None;

}

self.value += 1;

return Some(self.value - 1);

}

fn main()

{

let iterator : NumberIterator = NumberIterator::new(10, 19);

for value in iterator.take(5)

{

println!("{}", value);

}