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©Copyright 1996 Rogue Wave Software

RWTValDlist<T>

• Synopsis
• Please Note!
• Description
• Persistence
• Example
• Related Classes
• Public Typedefs
• Public Constructors
• Public Member Operators
• Public Member Functions
• Static Public Data Member
• Related Global Operators

#include <rw/tvdlist.h> 
RWTValDlist<T> dlist;

This class maintains a collection of values, implemented as a doubly-linked list.

Isomorphic

In this example, a doubly-linked list of user type Dog is exercised.

//

// tvdldog.cpp
//
#include <rw/tvdlist.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:
  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(){
  RWTValDlist<Dog> terriers;
  terriers.insert("Cairn Terrier");  // NB: type conversion occurs
  terriers.insert("Irish Terrier");
  terriers.insert("Schnauzer");

  cout << "The list " <<
    (terriers.contains("Schnauzer") ? "does " : "does not ") <<
    "contain a Schnauzer\n";

  terriers.insertAt(
      terriers.index("Irish Terrier"),
      "Fox Terrier"
    );

  while (!terriers.isEmpty())
    cout << terriers.get() << endl;

  return 0;
}
Program Output:
   The list does contain a Schnauzer
   Cairn Terrier
   Fox Terrier
   Irish Terrier
   Schnauzer

Classes RWTValDeque<T>, RWTValSlist<T>, and RWTValOrderedVector<T> also provide a Rogue Wave 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::iterator               iterator;
typedef container_type::const_iterator         const_iterator;
typedef container_type::size_type              size_type;
typedef T                                      value_type;
typedef T&                                     reference;
typedef const T&                               const_reference;

RWTValDlist<T>();

Constructs an empty, doubly-linked list.

RWTValDlist<T>(const list<T,allocator>& lst);

Constructs a doubly-linked list by copying all elements of lst.

RWTValDlist<T>(const RWTValDlist<T>& rwlst);

Copy constructor.

RWTValDlist<T>(size_type n, const T& val = T());

Constructs a doubly-linked list with n elements, each initialized to val.

RWTValDlist<T>(const T* first, const T* last);

Constructs a doubly-linked list by copying elements from the array of Ts pointed to by first, up to, but not including, the element pointed to by last.

RWTValDlist<T>&
operator=(const RWTValDlist<T>& lst);
RWTValDlist<T>&
operator=(const list<T,allocator>& lst);

Calls the destructor on all elements of self and replaces them by copying all elements of lst.

bool
operator<(const RWTValDlist<T>& lst) const;
bool
operator<(const list<T,allocator>& lst) const;

Returns true if self compares lexicographically less than lst, otherwise returns false. Type T must have well-defined less-than semantics (T::operator<(const T&) or equivalent).

bool
operator==(const RWTValDlist<T>& lst) const;
bool
operator==(const list<T,allocator>& lst) const;

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.

reference
operator()(size_type i);
const_reference
operator()(size_type i) const;

Returns a reference to the ith element of self. Index i should 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(const_reference a);

Adds the item a to the end of the collection.

void
apply(void (*fn)(reference,void*), void* d);
void
apply(void (*fn)(const_reference,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(const_reference a, void* d); 
   void yourfun(reference a, void* d);

Client data may be passed through parameter d.

reference
at(size_type i);

const_reference
at(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.

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. Each item will have its destructor called.

bool
contains(const_reference 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)(const_reference,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 prototype:

   bool yourTester(const_reference a, void* d);

Client data may be passed through parameter d.

iterator
end();
const_iterator
end() const;

Returns a past-the-end valued iterator of self.

size_type
entries() const;

Returns the number of elements in self.

bool
find(const_reference a, T& k) const;

If there exists an element t in self such that the expression (t == a) is true, assigns t to k and returns true. Otherwise, returns false and leaves the value of k unchanged.

bool
find(bool (*fn)(const_reference,void*), void* d, T& k) const;

If there exists an element t in self such that the expression ((*fn)(t,d)) is true, assigns t to k and returns true. Otherwise, returns false and leaves the value of k unchanged. fn points to a user-defined tester function which must have prototype:

   bool yourTester(const_reference a, void* d);

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. If the collection is empty, the function throws an exception of type RWBoundsErr. This method is identical to removeFirst and is included for compatibility with previous versions.

size_type
index(const_reference 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)(const_reference,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 prototype:

   bool yourTester(const_reference a, void* d);

Client data may be passed through parameter d.

bool
insert(const_reference a);

Adds the item a to the end of the collection. Returns true.

void
insertAt(size_type i,const_reference a);

Inserts the item a in front of the item at position i in self. This position must be between 0 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.

reference
last();
const_reference
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 minimum or maximum element in the collection. Type T must have well-defined less-than semantics (T::operator<(const T&) or equivalent).

size_type 
occurrencesOf(const_reference a) const;

Returns the number of elements t in self such that the expression (t == a) is true.

size_type
occurrencesOf(bool (*fn)(const_reference,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 prototype:

   bool yourTester(const_reference a, void* d);

Client data may be passed through parameter d.

void
prepend(const_reference a);

Adds the item a to the beginning of the collection.

bool
remove(const_reference a);

Removes the first element t in self such that the expression (t == a) is true and returns true. Returns false if there is no such element.

bool
remove(bool (*fn)(const_reference,void*), void* d);

Removes the first element t in self such that the expression ((*fn)(t,d)) is true and returns true. Returns false if there is no such element. fn points to a user-defined tester function which must have prototype:

   bool yourTester(const_reference a, void* d);

Client data may be passed through parameter d.

size_type
removeAll(const_reference 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)(const_reference,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 prototype:

   bool yourTester(const_reference a, void* d);

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 0 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_reference oldVal, const_reference newVal);

Replaces all elements t in self such that the expression (t == oldVal) is true with newVal. Returns the number of items replaced.

size_type
replaceAll(bool (*fn)(const_reference,void*), void* d,
           const value_type& newval);

Replaces 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(const_reference a, void* d);

Client data may be passed through parameter d.

void
sort();

Sorts the collection using the less-than operator to compare elements.

list<T,allocator>&
std();
const list<T>&
std() const;

Returns a reference to the underlying C++-standard collection that serves as the implementation for self. This reference may be used freely, providing access to the C++-standard interface as well as interoperability with other software components that make use of the C++-standard collections.

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 RWTValDlist<T>& coll);
RWFile&
operator<<(RWFile& strm, const RWTValDlist<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, RWTValDlist<T>& coll);
RWFile&
operator>>(RWFile& strm, RWTValDlist<T>& coll);

Restores the contents of the collection coll from the input stream strm.

RWvistream&
operator>>(RWvistream& strm, RWTValDlist<T>*& p);
RWFile&
operator>>(RWFile& strm, RWTValDlist<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.