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Constructor Parameter Method

Constructor Parameter Method

Constructor Method๋กœ ์ธ์Šคํ„ด์Šค๋ฅผ ๋งŒ๋“ค๋•Œ, ๊ทธ๋ฆฌ๋กœ ๋„˜๊ฒจ์ค€ ํŒŒ๋ผ๋ฉ”ํ„ฐ๋“ค์„ ์ƒˆ๋กญ๊ฒŒ ๋งŒ๋“ค์–ด์ง„ ์ธ์Šคํ„ด์Šค๋กœ ์–ด๋–ป๊ฒŒ ๊ฐ–๊ณ  ์˜ค๋Š”๊ฐ€? ๊ฐ€์žฅ ์œ ์—ฐํ•œ ๋ฐฉ๋ฒ•์€ ๊ฐ๊ฐ์˜ ๋ณ€์ˆ˜์— ๋Œ€ํ•ด setter๋“ค์„ ๋งŒ๋“ค์–ด ์ฃผ๋Š” ๊ฒƒ์ด๋‹ค. ์ฆ‰,
~cpp 
class Point
{
/* ... */
	void setX(int x) { /* ... */ }
	void setY(int y) { /* ... */ }
	static Point* makeFromXnY(int x, int y)
	{
		Point* pt = new Point;
		pt->setX(x);
		pt->setY(y);
		return pt;
	}
/* ... */
};
์ด๋ ‡๊ฒŒ ๋˜๋Š”๊ฒƒ์ด๋‹ค. ํ•˜์ง€๋งŒ ๋ณ€์ˆ˜๊ฐ€ ๋งŽ์•„์งˆ์ˆ˜๋ก setter๋“ค์€ ๊ณ„์† ๋Š˜์–ด๋‚œ๋‹ค. ์ด๋Ÿด๋•Œ์—๋Š” ๋ชจ๋“  ๋ณ€์ˆ˜๋ฅผ ํ•œ๋ฒˆ์— setํ•ด์ฃผ๋Š” ํ•˜๋‚˜์˜ ๋ฉ”์†Œ๋“œ๋ฅผ ๋งŒ๋“ ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ์ ‘๋‘์‚ฌ๋ฅผ set์œผ๋กœ ๋ช…๋ช…ํ•ด์ฃผ๊ณ  ๋ณ€์ˆ˜์˜ ์ด๋ฆ„์„ ๋”ธ๋ ค์ค€๋‹ค.
~cpp 
class Point
{
/* ... */
	static Point* makeFromXnY(int x, int y)
	{
		Point* pt = new Point;
		pt->setXnY(x,y);
		return pt;
	}
	void setXnY(int x, int y) // smalltalk์—์„œ๋Š” setX:xNum y:yNum์ด๋ผ๋Š” ๋ฉ”์„ธ์ง€๋ฅผ ์‚ฌ์šฉํ•œ๋‹ค.
	{
		this->x = x;
		this->y = y;
	}
/* ... */
};

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