RWTPtrMultiSet(3C++) RWTPtrMultiSet(3C++)
Name
RWTPtrMultiSet<T,C> - Rogue Wave library class
Synopsis
#include <rw/tpmset.h>
RWTPtrMultiSet<T,C> s;
Standard C++ Library Dependent!RWTPtrMultiSet requires the Standard C++ Library.
Description
This class maintains a pointer-based collection of values, which are
ordered according to a comparison object of type C. Class T is the type
pointed to by the items in the collection. C must induce a total ordering
on elements of type T via a public member
bool operator()(const T& x, const T& y)
which returns true if x should precede y within the collection. The
structure less<T> from the C++-standard header file <functional> is an
example. Note that items in the collection will be dereferenced before
being compared. RWTPtrMultiSet<T,C> may contain multiple items that
compare equal to each other. (RWTPtrSet<T,C> will not accept an item
that compares equal to an item already in the collection.)
Persistence
Isomorphic.
Examples
In this example, a multi-set of RWCStrings is exercised.
//
// tpmset.cpp
//
#include <rw/tpmset.h>
#include <rw/cstring.h>
#include <iostream.h>
#include <function.h>
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main(){
RWTPtrMultiSet<RWCString, less<RWCString> > set;
set.insert(new RWCString("one"));
set.insert(new RWCString("two"));
set.insert(new RWCString("three"));
set.insert(new RWCString("one")); // OK: duplicates allowd
cout << set.entries() << endl; // Prints "4"
set.clearAndDestroy();
cout << set.entries() << endl; // Prints "0"
return 0;
Related Classes
}
Class RWTPtrSet<T,C> offers the same interface to a pointer-based
collection that will not accept multiple items that compare equal to each
other. RWTPtrMultiMap<K,T,C> maintains is a pointer-based collection of
key-value pairs. Class multiset<T*, rw_deref_compare<C,T>,allocator > is
the C++-standard collection that serves as the underlying implementation
for RWTPtrMultiSet<T,C>.
Public Typedefs
typedef rw_deref_compare<C,T> container_comp;
typedef multiset<T*, container_comp,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 T* const& reference;
typedef T* const& const_reference;
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Public Constructors
RWTPtrMultiSet<T,C>(const container_comp& = container_comp());
Constructs an empty set.
RWTPtrMultiSet<T,C>(const RWTPtrMultiSet<T,C>& rws);
Copy constructor.
RWTPtrMultiSet<T,C>(const container_type>& ms);
Constructs a multimap by copying all elements from ms.
RWTPtrMultiSet<T,C>(T* const* first,T* const* last,const container_comp& = container_comp());
Constructs a set by copying elements from the array of T*s pointed to by
first, up to, but not including, the element pointed to by last.
Public Member Operators
RWTPtrMultiSet<T,C>&
operator=(const container_type>& s);
RWTPtrMultiSet<T,C>&
operator=(const RWTPtrMultiSet<T,C>& s);
Clears all elements of self and replaces them by copying all elements of
s.
bool
operator<(const RWTPtrMultiSet<T,C>& s) const;
Returns true if self compares lexicographically less than s, 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 RWTPtrMultiSet<T,C>& s) const;
Returns true if self compares equal to s, 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
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compared.
Public Member Functions
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 prototype:
void yourfun(const T* a, void* d);
Client data may be passed through parameter d.
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 that compares equal to
*a, otherwise returns false.
bool
contains(bool (*fn)(const T*,void*), void* d) const;
Returns true if there exists an element t in self such that the
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expression ((*fn)(t,d)) is true, otherwise returns false. fn points to a
user-defined tester function which must have prototype:
bool yourTester(const T* a, void* d);
Client data may be passed through parameter d.
void
difference(const RWTPtrMultiSet<T,C>& s);
Sets self to the set-theoretic difference given by (self - s). Elements
from each set are dereferenced before being compared.
iterator
end();
const_iterator
end() const;
Returns an iterator positioned "just past" the last element in self.
size_type
entries();
Returns the number of items in self.
const 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.
const 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 prototype:
bool yourTester(const T* a, void* d);
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Client data may be passed through parameter d.
bool
insert(T* a);
Adds the item a to the collection. Returns true.
void
intersection(const RWTPtrMultiSet<T,C>& s);
Sets self to the intersection of self and s. Elements from each set are
dereferenced before being compared.
bool
isEmpty() const;
Returns true if there are no items in the collection, false otherwise.
bool
isEquivalent(const RWTPtrMultiSet<T,C>& s) const;
Returns true if there is set equivalence between self and s, and returns
false otherwise.
bool
isProperSubsetOf(const RWTPtrMultiSet<T,C>& s) const;
Returns true if self is a proper subset of s, and returns false
otherwise.
bool
isSubsetOf(const RWTPtrMultiSet<T,C>& s) const;
Returns true if self is a subset of s or if self is set equivalent to
rhs, false otherwise.
size_type
occurrencesOf(const T* a) const;
Returns the number of elements t in self that compare equal to *a.
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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 prototype:
bool yourTester(const T* a, void* d);
Client data may be passed through parameter d.
T*
remove(const T* a);
Removes and returns the first element t in self that compares equal to
*a. Returns rwnil if there is no such element.
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 prototype:
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 that compare equal to *a. Returns the
number of items removed.
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
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tester function which must have prototype:
bool yourTester(const T* a, void* d);
Client data may be passed through parameter d.
multiset<T*, container_comp,allocator>&
std();
const multiset<T*, container_comp,allocator>&
std() const;
Returns a reference to the underlying C++-standard collection that serves
as the implementation for self.
void
symmetricDifference(const RWTPtrMultiSet<T,C>& s);
Sets self to the symmetric difference of self and s. Elements from each
set are dereferenced before being compared.
void
Union(const RWTPtrMultiSet<T,C>& s);
Sets self to the union of self and s. Elements from each set are
dereferenced before being compared. Note the uppercase "U" in Union to
avoid conflict with the C++ reserved word.
Related Global Operators
RWvostream&
operator<<(RWvostream& strm, const RWTPtrMultiSet<T,C>& coll);
RWFile&
operator<<(RWFile& strm, const RWTPtrMultiSet<T,C>& 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, RWTPtrMultiSet<T,C>& coll);
RWFile&
operator>>(RWFile& strm, RWTPtrMultiSet<T,C>& coll);
Restores the contents of the collection coll from the input stream strm.
RWvistream&
operator>>(RWvistream& strm, RWTPtrMultiSet<T,C>*& p);
RWFile&
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operator>>(RWFile& strm, RWTPtrMultiSet<T,C>*& 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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