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CHAPTER 8 EXPRESSIONS AND OPERATORS
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Restrictions on Operator Overloading
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Not all operators can be overloaded, and there are restrictions on the types of overloading that can be done. The important things you should know about the restrictions on operator overloading are described later in the section. Only the following operators can be overloaded. Prominently missing from the list is the assignment operator. Overloadable unary operators: +, -, !, ~, ++, --, true, false Overloadable binary operators: +, -, *, /, %, &, |, ^, <<, >>, ==, !=, >, <, >=, <= The increment and decrement operators are overloadable. But unlike the predefined versions, there is no distinction between the pre- and post- usage of the overloaded operator. You cannot do the following things with operator overloading: Create a new operator Change the syntax of an operator Redefine how an operator works on the predefined types Change the precedence or associativity of an operator
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Note Your overloaded operators should conform to the intuitive meanings of the operators.
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CHAPTER 8 EXPRESSIONS AND OPERATORS
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Example of Operator Overloading
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The following example shows the overloads of three operators for class LimitedInt: negation, subtraction, and addition. class LimitedInt { const int MaxValue = 100; const int MinValue = 0; public static LimitedInt operator -(LimitedInt x) { // In this strange class, negating a value just sets its value to 0. LimitedInt li = new LimitedInt(); li.TheValue = 0; return li; } public static LimitedInt operator -(LimitedInt x, LimitedInt y) { LimitedInt li = new LimitedInt(); li.TheValue = x.TheValue - y.TheValue; return li; } public static LimitedInt operator +(LimitedInt x, double y) { LimitedInt li = new LimitedInt(); li.TheValue = x.TheValue + (int)y; return li; } private int _TheValue = 0; public int TheValue { get { return _TheValue; } set { if (value < MinValue) _TheValue = 0; else _TheValue = value > MaxValue MaxValue : value; } } }
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CHAPTER 8 EXPRESSIONS AND OPERATORS
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class Program { static void Main() { LimitedInt li1 = new LimitedInt(); LimitedInt li2 = new LimitedInt(); LimitedInt li3 = new LimitedInt(); li1.TheValue = 10; li2.TheValue = 26; Console.WriteLine(" li1: {0}, li2: {1}", li1.TheValue, li2.TheValue); li3 = -li1; Console.WriteLine("-{0} = {1}", li1.TheValue, li3.TheValue); li3 = li2 - li1; Console.WriteLine(" {0} - {1} = {2}", li2.TheValue, li1.TheValue, li3.TheValue); li3 = li1 - li2; Console.WriteLine(" {0} - {1} = {2}", li1.TheValue, li2.TheValue, li3.TheValue); } } This code produces the following output: li1: -10 = 26 10 10, li2: 26 0 10 = 16 26 = 0
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The typeof Operator
The typeof operator returns the System.Type object of any type given as its parameter. From this object, you can learn the characteristics of the type. (There is only one System.Type object for any given type.) The operator s characteristics are listed in Table 8-17. The typeof operator is unary. Table 8-17. The typeof Operator
Operator
typeof
Description
Returns the System.Type object of a given type.
CHAPTER 8 EXPRESSIONS AND OPERATORS
The following is an example of the syntax of the typeof operator. Type is a class in the System namespace. Type t = typeof ( SomeClass ) You cannot overload the typeof operator, as that would defeat the .NET type-safety mechanisms. For example, the following code uses the typeof operator to get information on a class called SomeClass, and print the names of its public fields and methods. using System.Reflection; class SomeClass { public int Field1; public int Field2; public void Method1() { } public int Method2() { return 1; } } class Program { static void Main() { Type t = typeof(SomeClass); FieldInfo[] fi = t.GetFields(); MethodInfo[] mi = t.GetMethods(); foreach (FieldInfo f in fi) Console.WriteLine("Field : {0}", f.Name); foreach (MethodInfo m in mi) Console.WriteLine("Method: {0}", m.Name); } } The output of this code is the following: Field : Field : Method: Method: Method: Method: Method: Method: Field1 Field2 Method1 Method2 GetType ToString Equals GetHashCode
CHAPTER 8 EXPRESSIONS AND OPERATORS
The typeof operator is also called by the GetType method, which is available for every object of every type. For example, the following code retrieves the name of the type of the object: class SomeClass { ... } class Program { static void Main() { SomeClass s = new SomeClass(); Console.WriteLine("Type s: {0}", s.GetType().Name); } } This code produces the following output:
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