Records

code:records.cs

class Point{

public readonly float X;

public readonly float Y;

public Point With(float x = this.X, float y = this.Y)

=> new Point(x, y);

}

var p = new Point(1, 2);

var q = p.With(y: 3);

code:record.cs

// こういうコードが山ほど書かれる

class Point {

public readonly float X;

public readonly float Y;

public Point(float x, float y) {

X = x;

Y = y;

}

bool Equals(Point other) => (X, Y) = (other.X, other.Y);

int GetHashCode() => ....

}

// recordで削減できる．

record Point(float X, float Y); // プライマリコンストラクタ

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