RWTPtrDeque(3C++) RWTPtrDeque(3C++)
Name
RWTPtrDeque<T> - Rogue Wave library class
Synopsis
#include <rw/tpdeque.h>
RWTPtrDeque<T> deq;
Please NoteRWTPtrDeque requires the Standard C++ Library.
Description
This class maintains a pointer-based collection of values, implemented as
a double-ended queue, or deque. Class T is the type pointed to by the
items in the collection.
Persistence
Isomorphic
Example
In this example, a double-ended queue of ints is exercised.
// tpdeque.cpp
#include <rw/tpdeque.h>
#include <iostream.h>
/*
* This program partitions integers into even and odd numbers
*/
int main(){
RWTPtrDeque<int> numbers;
int n;
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cout << "Input an assortment of integers (EOF to end):"
<< endl;
while (cin >> n) {
if (n % 2 == 0)
numbers.pushFront(new int(n));
else
numbers.pushBack(new int(n));
}
while (numbers.entries()) {
cout << *numbers.first() << endl;
delete numbers.popFront();
}
return 0;
}
Program Input:
1 2 3 4 5
<eof>
Program Output:
4
2
1
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Related Classes
5
Classes RWTPtrDlist<T>, RWTPtrSlist<T>, and RWTPtrOrderedVector<T> also
provide a Rogue Wave pointer-based interface to C++-standard sequence
collections. Class deque<T*, allocator> is the C++-standard collection
that serves as the underlying implementation for this class.
Public Typedefs
typedef deque<T*, allocator> container_type;
typedef container_type::iterator iterator;
typedef container_type::const_iterator const_iterator;
typedef container_type::size_type size_type;
typedef container_type::difference_type difference_type;
typedef T* value_type;
typedef T*& reference;
typedef T* const& const_reference;
Public Constructors
RWTPtrDeque<T>();
Constructs an empty, double-ended queue.
RWTPtrDeque<T>(const deque<T*, allocator>& deq);
Constructs a double-ended queue by copying all elements of deq.
RWTPtrDeque<T>(const RWTPtrDeque<T>& rwdeq);
Copy constructor.
RWTPtrDeque<T>(size_type n, T* a);
Constructs a double-ended queue with n elements, each initialized to a.
RWTPtrDeque<T>(T* const* first, T* const* last);
Constructs a double-ended queue by copying elements from the array of T*s
pointed to by first, up to, but not including, the element pointed to by
last.
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Public Member Operators
RWTPtrDeque<T>&
operator=(const RWTPtrDeque<T>& deq);
Clears all elements of self and replaces them by copying all elements of
deq.
RWTPtrDeque<T>&
operator=(const deque<T*, allocator>& stddeq);
Clears all elements of self and replaces them by copying all elements of
stddeq.
bool
operator<(const RWTPtrDeque<T>& deq);
Returns true if self compares lexicographically less than deq, 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 RWTPtrDeque<T>& deq);
Returns true if self compares equal to deq, 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 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;
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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.
Public Member Functions
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)(const T*,void*), void* d) const;
void
apply(void (*fn)(T*&,void*), void* d);
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(T*& a, void* d);
for reference semantics. 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.
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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;
If there exists an element t in self such that the expression (*t == *a)
is true, returns true. Otherwise, returns false.
bool
contains (bool (*fn)(const T*, void*), void *d) const;
bool
contains(bool (*fn)(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)
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.
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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);
Client data may be passed through parameter d.
reference
first();
const_reference
first() const;
Returns a reference to the first element of self. If the collection is
empty, the function throws an exception of type RWBoundsErr.
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:
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bool yourTester(T* a, void* d);
bool yourTester(const T* a, void* d);
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 element of self.
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;
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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);
Client data may be passed through parameter d.
T*
popBack();
Removes and returns the last item in the collection.
T*
popFront();
Removes and returns the first item in the collection.
void
prepend(T* a);
Adds the item a to the beginning of the collection.
void
pushBack(T* a);
Adds the item a to the end of the collection.
void
pushFront(T* a);
Adds the item a to the beginning of the collection.
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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 const T*
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)(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);
Client data may be passed through parameter d.
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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* x, T* newVal);
size_type
replaceAll(bool (*fn)(const T*, void*), void* x,
const 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 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.
void
sort();
Sorts the collection using the less-than operator to compare elements.
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Elements are dereferenced before being compared.
deque<T*, allocator>&
std();
const deque<T*, allocator>&
std() const;
Returns a reference to the underlying C++-standard collection that serves
as the implementation for self.
Static Public Data Member
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.
Related Global Operators
RWvostream&
operator<<(RWvostream& strm, const RWTPtrDeque<T>& coll);
RWFile&
operator<<(RWFile& strm, const RWTPtrDeque<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, RWTPtrDeque<T>& coll);
RWFile&
operator>>(RWFile& strm, RWTPtrDeque<T>& coll);
Restores the contents of the collection coll from the input stream strm.
RWvistream&
operator>>(RWvistream& strm, RWTPtrDeque<T>*& p);
RWFile&
operator>>(RWFile& strm, RWTPtrDeque<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.
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