Sets in BCB

     Sets in BCB are an emulation of Pascal sets. They are 
     implemented as a class template. Therefore this is easier 
     to understand if you are familiar with both Pascal sets 
     and C++ templates - but it's not essential.
     
     A set type is declared like this:
     
     typedef Set <element_type, minval, maxval> set_type;
     
     I will no doubt be shot down in flames for saying this, but
     you can think of this as using a kind of super-macro which sets
     up a class 'set_type', an instance of which can hold elements
     of type 'element_type' between 'minval' and 'maxval'. That
     falls a long way short of describing C++ templates but it's
     good enough!
     
     Then you can declare instances of this set type as needed:
     
     set_type mySet;
     
     Borland have used overloaded stream operators << and >> to
     permit adding elements to a set and removing them - the
     analogy with streams is imperfect but does make sense.
     
     The following is a trivial console app which demonstrates
     the basic use of Sets:
     
     //---------------------------------------------------------------------------
     #include <vcl\condefs.h>
     #include <stdio.h>
     #include <stdlib.h>
     #include <string.h>
     
     #include <vcl\sysdefs.h>       // needed for sets
     #include <iostream.h>
     #include <conio.h>
     
     #pragma hdrstop
     //---------------------------------------------------------------------------
     USERES("Project1.res");
     //---------------------------------------------------------------------------
     
     typedef enum {apples, oranges, bananas, pears} fruit_t;
     typedef Set < fruit_t, apples, pears > fruit_set;
     
     void ShowFruit(const fruit_set &fs);
     
     int main(int argc, char **argv)
     {
         fruit_set FruitBowl;                            // create the set
         FruitBowl << apples << bananas << pears;        // initialise it
         ShowFruit(FruitBowl);
         FruitBowl >> apples;                            // take out apples
         FruitBowl << oranges;                           // add oranges
         ShowFruit(FruitBowl);
         FruitBowl.Clear();                              // empty the bowl
         ShowFruit(FruitBowl);
     
         getch();     //pause
         return 0;
     }
     
     void ShowFruit(const fruit_set &fs)
     {
     cout << "[ ";
     if (fs.Contains(apples)) cout << "apples ";
     if (fs.Contains(oranges)) cout << "oranges ";
     if (fs.Contains(bananas)) cout << "bananas ";
     if (fs.Contains(pears)) cout << "pears ";
     cout << "]" << endl << endl;
     }
     
     //=========================================
     
     The rest of the syntax for sets is in the online help. Good luck!
     
     Steve Balcombe