C# implicit

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class Digit
{ 
    public double val; 
     
    public Digit(double d)
    { 
        val = d; 
    } 
     
    // 将 Digit 对象转换成 double 数字 
    public static implicit operator double(Digit d)
    { 
        return d.val; 
    } 
     
    // 将 double 数字转换成 Digit 对象 
    public static implicit operator Digit(double d)
    { 
        return new Digit(d); 
    } 
} 
 
class Program
{ 
    static void Main(string[] args)
    { 
        // test 
        Digit dig = 2.1d; 
        // test 
        double d = dig; 
    } 
}