Operator Overloading in C#

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Operator Overloading
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The complete Nybble class is shown here along with a NybbleDemo, which demonstrates its use:
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PART I PART I PART I
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// Create a 4-bit type called Nybble using System; // A 4-bit type class Nybble { int val; // underlying storage public Nybble() { val = 0; } public Nybble(int i) { val = i; val = val & 0xF; // retain lower 4 bits } // Overload binary + for Nybble + Nybble public static Nybble operator +(Nybble op1, Nybble op2) { Nybble result = new Nybble(); resultval = op1val + op2val; resultval = resultval & 0xF; // retain lower 4 bits return result; } // Overload binary + for Nybble + int public static Nybble operator +(Nybble op1, int op2) { Nybble result = new Nybble(); resultval = op1val + op2; resultval = resultval & 0xF; // retain lower 4 bits return result; } // Overload binary + for int + Nybble public static Nybble operator +(int op1, Nybble op2) { Nybble result = new Nybble(); resultval = op1 + op2val; resultval = resultval & 0xF; // retain lower 4 bits return result; } // Overload ++
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public static Nybble operator ++(Nybble op) { Nybble result = new Nybble(); resultval = opval + 1; resultval = resultval & 0xF; // retain lower 4 bits return result; } // Overload > public static bool operator >(Nybble op1, Nybble op2) { if(op1val > op2val) return true; else return false; } // Overload < public static bool operator <(Nybble op1, Nybble op2) { if(op1val < op2val) return true; else return false; } // Convert a Nybble into an int public static implicit operator int (Nybble op) { return opval; } // Convert an int into a Nybble public static implicit operator Nybble (int op) { return new Nybble(op); } } class NybbleDemo { static void Main() { Nybble a = new Nybble(1); Nybble b = new Nybble(10); Nybble c = new Nybble(); int t; ConsoleWriteLine("a: " + (int) a); ConsoleWriteLine("b: " + (int) b); // Use a Nybble in an if statement if(a < b) ConsoleWriteLine("a is less than b\n"); // Add two Nybbles together c = a + b; ConsoleWriteLine("c after c = a + b: " + (int) c);
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Operator Overloading
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// Add an int to a Nybble a += 5; ConsoleWriteLine("a after a += 5: " + (int) a);
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PART I PART I PART I
ConsoleWriteLine(); // Use a Nybble in an int expression t = a * 2 + 3; ConsoleWriteLine("Result of a * 2 + 3: " + t); ConsoleWriteLine(); // Illustrate int assignment and overflow a = 19; ConsoleWriteLine("Result of a = 19: " + (int) a); ConsoleWriteLine(); // Use a Nybble to control a loop ConsoleWriteLine("Control a for loop with a Nybble"); for(a = 0; a < 10; a++) ConsoleWrite((int) a + " "); ConsoleWriteLine(); } }
The output from the program is shown here:
a: 1 b: 10 a is less than b c after c = a + b: 11 a after a += 5: 6 Result of a * 2 + 3: 15 Result of a = 19: 3 Control a for loop with a Nybble 0 1 2 3 4 5 6 7 8 9
Although most of the operation of Nybble should be easy to understand, there is one important point to make: The conversion operators play a large role in the integration of Nybble into the C# type system Because conversions are defined from Nybble to int and from int to Nybble, a Nybble object can be freely mixed in arithmetic expressions For example, consider this expression from the program:
t = a * 2 + 3;
Here, t is an int, as are 2 and 3, but a is a Nybble These two types are compatible in the expression because of the implicit conversion of Nybble to int In this case, since the rest of the expression is of type int, a is converted to int by its conversion method
Part I:
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