#include <rw/tpdlist.h> RWTPtrDlist<T> dlist;
If you have the Standard C++ Library, use the interface described here. Otherwise, use the restricted interface to RWTPtrDlist described in Appendix A.
This class maintains a pointer-based collection of values, implemented as a doubly-linked list. Class T is the type pointed to by the items in the collection.
Isomorphic
In this example, a pointer-based doubly-linked list of user type Dog is exercised.
//
// tpdlist.cpp
//
#include <rw/tpdlist.h>
#include <iostream.h>
#include <string.h>
class Dog {
char* name;
public:
Dog( const char* c) {
name = new char[strlen(c)+1];
strcpy(name, c); }
~Dog() { delete name; }
// Define a copy constructor:
Dog(const Dog& dog) {
name = new char[strlen(dog.name)+1];
strcpy(name, dog.name); }
// Define an assignment operator:
void operator=(const Dog& dog) {
if (this!=&dog) {
delete name;
name = new char[strlen(dog.name)+1];
strcpy(name, dog.name);
}
}
// Define an equality test operator:
int operator==(const Dog& dog) const {
return strcmp(name, dog.name)==0; }
// Order alphabetically by name:
int operator<(const Dog& dog) const {
return strcmp(name, dog.name)<0; }
friend ostream& operator<<(ostream& str, const Dog& dog){
str << dog.name;
return str;}
};
main(){
RWTPtrDlist<Dog> terriers;
terriers.insert(new Dog("Cairn Terrier"));
terriers.insert(new Dog("Irish Terrier"));
terriers.insert(new Dog("Schnauzer"));
Dog key1("Schnauzer");
cout << "The list " <<
(terriers.contains(&key1) ? "does " : "does not ") <<
"contain a Schnauzer\n";
Dog key2("Irish Terrier");
terriers.insertAt(
terriers.index(&key2),
new Dog("Fox Terrier")
);
Dog* d;
while (!terriers.isEmpty()) {
d = terriers.get();
cout << *d << endl;
delete d;
}
return 0;
}
Program Output:
The list does contain a Schnauzer
Cairn Terrier
Fox Terrier
Irish Terrier
Schnauzer
Classes RWTPtrDeque<T>, RWTPtrSlist<T>, and RWTPtrOrderedVector<T> also provide a Rogue Wave pointer-based interface to C++-standard sequence collections.
Class list<T*, allocator> is the C++-standard collection that serves as the underlying implementation for this class.
typedef list<T*, allocator> container_type; typedef container_type::size_type size_type; typedef container_type::difference_type difference_type; typedef container_type::iterator iterator; typedef container_type::const_iterator const_iterator; typedef T* value_type; typedef typedef T* reference; typedef T* const& const_reference;
RWTPtrDlist<T>();
Constructs an empty, doubly-linked list.
RWTPtrDlist<T>(const RWTPtrDlist<T>& rwlst);
Copy constructor.
RWTPtrDlist<T>(const list<T*, allocator>& lst);
Constructs a pointer based doubly linked list by copying all elements of lst.
RWTPtrDlist<T>(size_type n, T* a=0);
Constructs a doubly-linked list with n elements, each initialized to a.
RWTPtrDlist<T>(T*const* first, T*const* last);
Constructs a doubly-linked list by copying elements from the array of T*s pointed to by first, up to, but not including, the element pointed to by last.
RWTPtrDlist<T>& operator=(const list<T*, allocator>& lst); RWTPtrDlist<T>& operator=(const RWTPtrDlist<T>& lst);
Clears all elements of self and replaces them by copying all elements of lst.
bool operator<(const RWTPtrDlist<T>& lst);
Returns true if self compares lexicographically less than lst, otherwise returns false. Items in each collection are dereferenced before being compared. Assumes that type T has well-defined less-than semantics.
bool operator==(const RWTPtrDlist<T>& lst);
Returns true if self compares equal to lst, otherwise returns false. Two collections are equal if both have the same number of entries, and iterating through both collections produces, in turn, individual elements that compare equal to each other. Elements are dereferenced before being compared.
reference operator()(size_type i); const_reference operator()(size_type i) const;
Returns a reference to the ith element of self. Index i must be between 0 and one less then the number of entries, otherwise the results are undefined--no bounds checking is performed.
reference operator[](size_type i); const_reference operator[](size_type i) const;
Returns a reference to the ith element of self. Index i must be between 0 and one less then the number of entries in self, otherwise the function throws an exception of type RWBoundsErr.
void append(T* a);
Adds the item a to the end of the collection.
void apply(void (*fn)(T*,void*), void* d); void apply(void (*fn)(T*&,void*), void* d); void apply(void (*fn)(const T*,void*), void* d) const;
Applies the user-defined function pointed to by fn to every item in the collection. This function must have one of the prototypes:
void yourfun(T* a, void* d); void yourfun(const T* a, void* d); void yourfun(reference a, void* d);
Client data may be passed through parameter d.
const const_reference at (size_type i); reference at(size_type i);
Returns a reference to the ith element of self. Index i must be between 0 and one less then the number of entries in self, otherwise the function throws an exception of type RWBoundsErr.
iterator begin(); const_iterator begin() const;
Returns an iterator positioned at the first element of self.
void clear();
Clears the collection by removing all items from self.
void clearAndDestroy();
Removes all items from the collection and uses operator delete to destroy the objects pointed to by those items. Do not use this method if multiple pointers to the same object are stored.
bool contains(const T* a) const;
Returns true if there exists an element t in self such that the expression(*t == *a) is true, otherwise returns false.
bool contains(bool (*fn)(T*,void*), void* d) const; bool contains(bool (*fn)(const T*,void*), void* d) const;
Returns true if there exists an element t in self such that the expression ((*fn)(t,d)) is true, otherwise returns false. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
for the const version. Client data may be passed through parameter d.
iterator end(); const_iterator end() const;
Returns an iterator positioned "just past" the last element in self.
size_type entries() const;
Returns the number of items in self.
T* find(const T* a) const;
If there exists an element t in self such that the expression (*t == *a) is true, returns t. Otherwise, returns rwnil.
T* find(bool (*fn)(T*,void*), void* d) const; T* find(bool (*fn)(const T*,void*), void* d) const;
If there exists an element t in self such that the expression ((*fn)(t,d)) is true, returns t. Otherwise, returns rwnil. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
for the const version. Client data may be passed through parameter d.
reference first(); const_reference first() const;
Returns a reference to the first element of self.
T* get();
Removes and returns the first element in the collection.
size_type index(const T* a) const;
Returns the position of the first item t in self such that (*t == *a), or returns the static member npos if no such item exists.
size_type index(bool (*fn)(T*,void*), void* d) const; size_type index(bool (*fn)(const T*,void*), void* d) const;
Returns the position of the first item t in self such that((*fn)(t,d)) is true, or returns the static member npos if no such item exists. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
for the const version. Client data may be passed through parameter d.
bool insert(T* a);
Adds the item a to the end of the collection. Returns true.
void insertAt(size_type i, T* a);
Inserts the item a in front of the item at position i in self. This position must be between zero and the number of entries in the collection, otherwise the function throws an exception of type RWBoundsErr.
bool isEmpty() const;
Returns true if there are no items in the collection, false otherwise.
T*& last(); T*const& last() const;
Returns a reference to the last item in the collection.
reference maxElement(); const_reference maxElement() const; reference minElement(); const_reference minElement() const;
Returns a reference to the maximum or minimum element in self.
size_type occurrencesOf(const T* a) const;
Returns the number of elements t in self such that the expression (*t == *a) is true.
size_type occurrencesOf(bool (*fn)( T*,void*), void* d) const; size_type occurrencesOf(bool (*fn)(const T*,void*), void* d) const;
Returns the number of elements t in self such that the expression((*fn)(t,d)) is true. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
for the const version. Client data may be passed through parameter d.
void prepend(T* a);
Adds the item a to the beginning of the collection.
T* remove(const T* a);
Removes and returns the first element t in self such that the expression (*t == *a) is true. Returns rwnil if there is no such element.
T* remove(bool (*fn)( T*,void*), void* d); T* remove(bool (*fn)(const T*,void*), void* d);
Removes and returns the first element t in self such that the expression ((*fn)(t,d)) is true. Returns rwnil if there is no such element. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
Client data may be passed through parameter d.
size_type removeAll(const T* a);
Removes all elements t in self such that the expression (*t == *a) is true. Returns the number of items removed.
size_type removeAll(bool (*fn)( T*,void*), void* d); size_type removeAll(bool (*fn)(const T*,void*), void* d);
Removes all elements t in self such that the expression ((*fn)(t,d))is true. Returns the number of items removed. fn points to a user-defined tester function which must have one of the prototypes:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
for the const version. Client data may be passed through parameter d.
T* removeAt(size_type i);
Removes and returns the item at position i in self. This position must be between zero and one less then the number of entries in the collection, otherwise the function throws an exception of type RWBoundsErr.
T* removeFirst();
Removes and returns the first item in the collection.
T* removeLast();
Removes and returns the first item in the collection.
size_type replaceAll(const T* oldVal,T* newVal);
Replaces with newVal all elements t in self such that the expression (*t == *oldVal) is true. Returns the number of items replaced.
size_type replaceAll(bool (*fn)(T*, void*),void* d,T* newVal); size_type replaceAll(bool (*fn)(const T*, void*),void* d,T* newVal);
Replaces with newVal all elements t in self such that the expression ((*fn)(t,d))is true. Returns the number of items replaced. fn points to a user-defined tester function which must have prototype:
bool yourTester(T* a, void* d); bool yourTester(const T* a, void* d);
Client data may be passed through parameter d.
void sort();
Sorts the collection using the less-than operator to compare elements. Elements are dereferenced before being compared.
list<T*, allocator>& std(); const list<T*, allocator>& std() const;
Returns a reference to the underlying C++-standard collection that serves as the implementation for self.
const size_type npos;
This is the value returned by member functions such as index to indicate a non-position. The value is equal to ~(size_type)0.
RWvostream& operator<<(RWvostream& strm, const RWTPtrDlist<T>& coll); RWFile& operator<<(RWFile& strm, const RWTPtrDlist<T>& coll);
Saves the collection coll onto the output stream strm, or a reference to it if it has already been saved.
RWvistream& operator>>(RWvistream& strm, RWTPtrDlist<T>& coll); RWFile& operator>>(RWFile& strm, RWTPtrDlist<T>& coll);
Restores the contents of the collection coll from the input stream strm.
RWvistream& operator>>(RWvistream& strm, RWTPtrDlist<T>*& p); RWFile& operator>>(RWFile& strm, RWTPtrDlist<T>*& p);
Looks at the next object on the input stream strm and either creates a new collection off the heap and sets p to point to it, or sets p to point to a previously read instance. If a collection is created off the heap, then you are responsible for deleting it.