_Beyond C++ Templates_
by Fred Wild


Example 1:

(a)

#define max(a,b)            (((a) > (b)) ? (a) : (b))

(b)
int larger ;
larger = max(item1, item2) ;   /* before preprocessing */

(c)

int larger ;
larger = (((item1) > (item2)) ? (item1) : (item2));  /* after preprocessing */

Example 2:

(a) 

#define MAKELISTCLASS(listname,itemtype)        \
class listname {                        \
public:                         \
    ...                     \
    void AddItem (itemtype theItem);            \
    void RemoveItem (itemtype theItem);     \
} ;                             \
                            \
inline listname##::AddItem (itemtype theItem) ...       \
                            \
inline listname##::RemoveItem (itemtype theItem) ...        \

(b)

MAKELISTCLASS (NameList, String)
 ...
NameList    students ; 
 ...
students.AddItem("Jane");
 ...


Example 3:

(a)

template<class T>
class List {
public:
    ...
    void AddItem (T theItem);
    void RemoveItem (T theItem);

} ;

template<class T>
List<T>::AddItem (T theItem) ...

template<class T>
List<T>::RemoveItem (T theItem) ...

(b)

List<String>    students ;
 ...
students.AddItem ("Jane");
 ...

Example 4:

(a)

#define  StrList   List<String>

(b)

StrList     students ;
 ...
students.AddItem("Jane") ;  


Example 5:

(a)


object PetOwner
    Name        :   String ;
    Pets        :   list_of  Pet ;
end ;

object Pet
    PetKind   :   String ;
    MyOwner   :   ptr_to   PetOwner ;
end ;


(b)

 ...

# create a constructor for each object
.each_obj

# output the constructor function signature and opening brace
:<obj.name>::<obj.name>() 
:{

# if the object has any 'list_of' attributes, output code
# to clear the list
.each_attr <attr.list_of>
:   <attr.name>.Clear();
.end


# if the object has any 'ptr_to' attributes, set them to NULL
.each_attr <attr.ptr_to>
:   <attr.name> = NULL ;
.end

# add a closing brace, and a trailing blank line
:}
:

.end  # .each_obj

...