overloading true and false operators?

uuh what the heck would that mean? if a class overloads true and false, what does it really mean?:D how would you use those operators for that class then?

(I'm an idiot as far as operator overloading is concerned, so please bear with me:D)

Don't know really if we can overload it, provided that they have the same type (of type bool). :D Just go for a condition.

VB Code:

class test
{
    bool boolean;
    public test(bool boolean)
    {
        if(boolean) true_statement();
        else false_statement();
    }
    void true_statement(){}
    void false_statement(){}
}

:D

this is what I meant

public static bool operator true (myClass val)
{
return true;
}

Oppss. :afrog:

Yes, you're right. Can't seem to find a good example why true/false operator is overloaded.

Just found this. Don't really understand it coz I don't really understand English well. :D But hopes this might have a use for you.

hmmmmmmmmmmmmmm
thanks, but I still dont understand it:D

Let's say you've created a class, and you want to perform value based comparisons between two instances (the default is reference comparisons) - you overload the ==, != and .Equals operators and methods to perform those comparisons.

hmm ok but this seems to be different. This is overriding TRUE and FALSE
public static bool operator true (myClass val)
{
return true;
} :confused:

Oh, sorry - misunderstood :p

From MSDN:

Quote:

---

The DBBool struct below implements a three-valued logical type. The possible values of this type are DBBool.True, DBBool.False, and DBBool.Null, where the Null member indicates an unknown value. Such three-valued logical types are commonly used in databases.

Code:

---

using System;
public struct DBBool
{
  // The three possible DBBool values.
  public static readonly DBBool Null = new DBBool(0);
  public static readonly DBBool False = new DBBool(-1);
  public static readonly DBBool True = new DBBool(1);
  // Private field that stores –1, 0, 1 for False, Null, True.
  sbyte value;
  // Private instance constructor. The value parameter must be –1, 0, or 1.
  DBBool(int value) {
      this.value = (sbyte)value;
  }
  // Properties to examine the value of a DBBool. Return true if this
  // DBBool has the given value, false otherwise.
  public bool IsNull { get { return value == 0; } }
  public bool IsFalse { get { return value < 0; } }
  public bool IsTrue { get { return value > 0; } }
  // Implicit conversion from bool to DBBool. Maps true to DBBool.True and
  // false to DBBool.False.
  public static implicit operator DBBool(bool x) {
      return x? True: False;
  }
  // Explicit conversion from DBBool to bool. Throws an exception if the
  // given DBBool is Null, otherwise returns true or false.
  public static explicit operator bool(DBBool x) {
      if (x.value == 0) throw new InvalidOperationException();
      return x.value > 0;
  }
  // Equality operator. Returns Null if either operand is Null, otherwise
  // returns True or False.
  public static DBBool operator ==(DBBool x, DBBool y) {
      if (x.value == 0 || y.value == 0) return Null;
      return x.value == y.value? True: False;
  }
  // Inequality operator. Returns Null if either operand is Null, otherwise
  // returns True or False.
  public static DBBool operator !=(DBBool x, DBBool y) {
      if (x.value == 0 || y.value == 0) return Null;
      return x.value != y.value? True: False;
  }
  // Logical negation operator. Returns True if the operand is False, Null
  // if the operand is Null, or False if the operand is True.
  public static DBBool operator !(DBBool x) {
      return new DBBool(-x.value);
  }
  // Logical AND operator. Returns False if either operand is False,
  // otherwise Null if either operand is Null, otherwise True.
  public static DBBool operator &(DBBool x, DBBool y) {
      return new DBBool(x.value < y.value? x.value: y.value);
  }
  // Logical OR operator. Returns True if either operand is True, otherwise
  // Null if either operand is Null, otherwise False.
  public static DBBool operator |(DBBool x, DBBool y) {
      return new DBBool(x.value > y.value? x.value: y.value);
  }
  // Definitely true operator. Returns true if the operand is True, false
  // otherwise.
  public static bool operator true(DBBool x) {
      return x.value > 0;
  }
  // Definitely false operator. Returns true if the operand is False, false
  // otherwise.
  public static bool operator false(DBBool x) {
      return x.value < 0;
  }
  public override bool Equals(object obj) {
      if (!(obj is DBBool)) return false;
      return value == ((DBBool)obj).value;
  }
  public override int GetHashCode() {
      return value;
  }
  public override string ToString() {
      if (value > 0) return "DBBool.True";
      if (value < 0) return "DBBool.False";
      return "DBBool.Null";
  }
}

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