C# Language Tutorial => operator

Example

Most of the built-in operators (including conversion operators) can be overloaded by using the operator keyword along with the public and static modifiers.

The operators comes in three forms: unary operators, binary operators and conversion operators.

Unary and binary operators requires at least one parameter of same type as the containing type, and some requires a complementary matching operator.

Conversion operators must convert to or from the enclosing type.

public struct Vector32
{
    
    public Vector32(int x, int y)
    {
        X = x;
        Y = y;
    }
    
    public int X { get; }
    public int Y { get; }

    public static bool operator ==(Vector32 left, Vector32 right)
        => left.X == right.X && left.Y == right.Y;

    public static bool operator !=(Vector32 left, Vector32 right)
        => !(left == right);

    public static Vector32 operator +(Vector32 left, Vector32 right)
        => new Vector32(left.X + right.X, left.Y + right.Y);

    public static Vector32 operator +(Vector32 left, int right)
        => new Vector32(left.X + right, left.Y + right);

    public static Vector32 operator +(int left, Vector32 right)
        => right + left;

    public static Vector32 operator -(Vector32 left, Vector32 right)
        => new Vector32(left.X - right.X, left.Y - right.Y);

    public static Vector32 operator -(Vector32 left, int right)
        => new Vector32(left.X - right, left.Y - right);

    public static Vector32 operator -(int left, Vector32 right)
        => right - left;

    public static implicit operator Vector64(Vector32 vector)
        => new Vector64(vector.X, vector.Y);

    public override string ToString() => $"{{{X}, {Y}}}";

}

public struct Vector64
{

    public Vector64(long x, long y)
    {
        X = x;
        Y = y;
    }

    public long X { get; }
    public long Y { get; }

    public override string ToString() => $"{{{X}, {Y}}}";

}

Example

var vector1 = new Vector32(15, 39);
var vector2 = new Vector32(87, 64);
        
Console.WriteLine(vector1 == vector2); // false
Console.WriteLine(vector1 != vector2); // true
Console.WriteLine(vector1 + vector2);  // {102, 103}
Console.WriteLine(vector1 - vector2);  // {-72, -25}

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