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C#/์ด๊ฒƒ์ด C#์ด๋‹ค

55. foreach๊ฐ€ ๊ฐ€๋Šฅํ•œ ๊ฐ์ฒด ๋งŒ๋“ค๊ธฐ

2022. 2. 27. 00:30
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foreach ๋ฌธ์€ for ๋ฌธ ์ฒ˜๋Ÿผ ์š”์†Œ์˜ ์œ„์น˜๋ฅผ ์œ„ํ•œ ์ธ๋ฑ์Šค ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•  ํ•„์š” ์—†๋‹ค.

foreach๋ฌธ์€ ์•„๋ฌด ํ˜•์‹์˜ ๊ฐ์ฒด์—์„œ๋‚˜ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋‹ค.

๋ฐฐ์—ด์ด๋‚˜ ๋ฆฌ์ŠคํŠธ ๊ฐ™์€ ์ปฌ๋ ‰์…˜์—์„œ๋งŒ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค.

foreach๋ฌธ์ด ๊ฐ์ฒด ๋‚ด์˜ ์š”์†Œ๋ฅผ ์ˆœํšŒํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” foreach๋ฌธ๊ณผ์˜ ์•ฝ์†์„ ์ง€์ผœ์•ผ ํ•˜๋Š”๋ฐ,

์•ฝ์†์ด ๋ญ๋‹ค? ์ธ.ํ„ฐ.ํŽ˜.์ด.์Šค

foreach ๊ตฌ๋ฌธ์€ IEnumerable์„ ์ƒ์†ํ•˜๋Š” ํ˜•์‹๋งŒ ์ง€์›ํ•œ๋‹ค.

์ฆ‰, ํด๋ž˜์Šค๋„ IEnumerable์„ ์ƒ์†ํ•˜๊ธฐ๋งŒ ํ•˜๋ฉด foreach ๋ฌธ์„ ์ด์šฉํ•ด์„œ ์š”์†Œ๋ฅผ ์ˆœํšŒํ•  ์ˆ˜ ์žˆ๊ฒŒ ํ•  ์ˆ˜ ์žˆ๋‹ค๋Š” ์ด์•ผ๊ธฐ์ด๋‹ค.

 

IEnumerable ์ธํ„ฐํŽ˜์ด์Šค๊ฐ€ ๊ฐ–๊ณ  ์žˆ๋Š” ๋ฉ”์†Œ๋“œ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๋‹จ ํ•˜๋‚˜ ๋ฟ์ด๋‹ค.

MyList๋Š” ์ด ๋ฉ”์†Œ๋“œ๋ฅผ ๊ตฌํ˜„ํ•ด์•ผ ํ•œ๋‹ค.

๋ฉ”์†Œ๋“œ ์„ค๋ช…
IEnumerator GetEnumerator() IEnumerator ํ˜•์‹์˜ ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜

GetEnumerator()๋Š” IEnumerator ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์ƒ์†ํ•˜๋Š” ํด๋ž˜์Šค์˜ ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ํ•ด์•ผ ํ•œ๋‹ค.

yield๋ฌธ์„ ์ด์šฉํ•˜๋ฉด IEnumerator๋ฅผ ์ƒ์†ํ•˜๋Š” ํด๋ž˜์Šค๋ฅผ ๋”ฐ๋กœ ๊ตฌํ˜„ํ•˜์ง€ ์•Š์•„๋„ ์ปดํŒŒ์ผ๋Ÿฌ๊ฐ€ ์ž๋™์œผ๋กœ ํ•ด๋‹น ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ๊ตฌํ˜„ํ•œ ํด๋ž˜์Šค๋ฅผ ์ƒ์„ฑํ•ด์ค€๋‹ค.

yield return๋ฌธ์€ ํ˜„์žฌ ๋ฉ”์†Œ๋“œ (GetEnumerator())์˜ ์‹คํ–‰์„ ์ผ์‹œ ์ •์ง€์‹œ์ผœ๋†“๊ณ  ํ˜ธ์ถœ์ž์—๊ฒŒ ๊ฒฐ๊ณผ๋ฅผ ๋ฐ˜ํ™˜ํ•œ๋‹ค.

๋ฉ”์†Œ๋“œ๊ฐ€ ๋‹ค์‹œ ํ˜ธ์ถœ๋˜๋ฉด, ์ผ์‹œ ์ •์ง€๋œ ์‹คํ–‰์„ ๋ณต๊ตฌํ•˜์—ฌ yirld return ๋˜๋Š” yield break ๋ฌธ์„ ๋งŒ๋‚  ๋•Œ๊นŒ์ง€ ๋‚˜๋จธ์ง€ ์ž‘์—…์„ ์‹คํ–‰ํ•˜๊ฒŒ ๋œ๋‹ค.

 

yield ํ‚ค์›Œ๋“œ๋ฅผ ์ด์šฉํ•˜๋Š” ๊ฐ„๋‹จํ•œ ์˜ˆ์ œ

using System;
using System.Collections;

namespace Yield
{
    class MyEnumerator
    {
        int[] numbers = { 1, 2, 3, 4 };
        public IEnumerator GetEnumerator()
        {
            yield return numbers[0];
            yield return numbers[1];
            yield return numbers[2];
            yield break;
            yield return numbers[3];
        }
    }

    class MainApp
    {
        static void Main(string[] args)
        {
            var obj = new MyEnumerator();
            foreach (int i in obj)
                Console.WriteLine(i);
        }
    }
}

 

<์ถœ๋ ฅ๊ฒฐ๊ณผ>

1
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3

GetEnumerator() ๋ฉ”์†Œ๋“œ๋Š” IEnumerator ํ˜•์‹์˜ ๊ฐ์ฒด,

๋‹ค์‹œ ๋งํ•ด IEnumerator ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์ƒ์†ํ•˜๋Š” ํด๋ž˜์Šค์˜ ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ํ•˜๋ฉด ๋œ๋‹ค.

 

 

<IEnumerator ์ธํ„ฐํŽ˜์ด์Šค์˜ ๋ฉ”์†Œ๋“œ ๋ฐ ํ”„๋กœํผํ‹ฐ ๋ชฉ๋ก>

๋ฉ”์†Œ๋“œ ๋˜๋Š” ํ”„๋กœํผํ‹ฐ ์„ค๋ช…
boolean MoveNext() ๋‹ค์Œ ์š”์†Œ๋กœ ์ด๋™. ์ปฌ๋ ‰์…˜์˜ ๋์„ ์ง€๋‚œ ๊ฒฝ์šฐ์—๋Š” false, ์ด๋™์ด ์„ฑ๊ณตํ•œ ๊ฒฝ์šฐ์—๋Š” true๋ฅผ ๋ฐ˜ํ™˜
void Reset() ์ปฌ๋ ‰์…˜์˜ ์ฒซ๋ฒˆ์งธ ์œ„์น˜์˜ '์•ž'์œผ๋กœ ์ด๋™. ์ฒซ๋ฒˆ์งธ ์œ„์น˜๊ฐ€ 0๋ฒˆ์ธ ๊ฒฝ์šฐ Reset()์„ ํ˜ธ์ถœํ•˜๋ฉด -1๋ฒˆ์œผ๋กœ ์ด๋™ํ•˜๋Š” ๊ฒƒ. ์ฒซ๋ฒˆ์งธ ์œ„์น˜๋กœ์˜ ์ด๋™์€ MoveNext()๋ฅผ ํ˜ธ์ถœํ•œ ๋‹ค์Œ์— ์ด๋ฃจ์–ด์ง
Object Current{get;} ์ปฌ๋ ‰์…˜์˜ ํ˜„์žฌ ์š”์†Œ๋ฅผ ๋ฐ˜ํ™˜

์ง€๊ธˆ๊นŒ์ง€ ์œ„์—์„œ yield๋ฌธ์˜ ๋„์›€์„ ๋ฐ›์•„์„œ IEnumerator๋ฅผ ์ƒ์†ํ•˜๋Š” ํด๋ž˜์Šค ๊ตฌํ˜„์„ ํ”ผํ–ˆ๊ณ ,


์•„๋ž˜๋ถ€ํ„ฐ๋Š” ์ง์ ‘ IEnumerator๋ฅผ ์ƒ์†ํ•˜๋Š” ํด๋ž˜์Šค๋ฅผ ๊ตฌํ˜„.

 

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