-\section{\class{wxList}}\label{wxlist}
-
-wxList classes provide linked list functionality for wxWidgets, and for an
-application if it wishes. Depending on the form of constructor used, a list
-can be keyed on integer or string keys to provide a primitive look-up ability,
-but please note that this feature is {\bf deprecated}.
-See \helpref{wxHashMap}{wxhashmap}\rtfsp for a faster method of storage
-when random access is required.
-
-While wxList class in the previous versions of wxWidgets only could contain
-elements of type wxObject and had essentially untyped interface (thus allowing
-you to put apples in the list and read back oranges from it), the new wxList
-classes family may contain elements of any type and has much more strict type
-checking. Unfortunately, it also requires an additional line to be inserted in
-your program for each list class you use (which is the only solution short of
-using templates which is not done in wxWidgets because of portability issues).
-
-The general idea is to have the base class wxListBase working with {\it void *}
-data but make all of its dangerous (because untyped) functions protected, so
-that they can only be used from derived classes which, in turn, expose a type
-safe interface. With this approach a new wxList-like class must be defined for
-each list type (i.e. list of ints, of wxStrings or of MyObjects). This is done
-with {\it WX\_DECLARE\_LIST} and {\it WX\_DEFINE\_LIST} macros like this
-(notice the similarity with WX\_DECLARE\_OBJARRAY and WX\_IMPLEMENT\_OBJARRAY
-macros):
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name: list.tex
+%% Purpose: wxList
+%% Author: wxWidgets Team
+%% Modified by:
+%% Created:
+%% RCS-ID: $Id$
+%% Copyright: (c) wxWidgets Team
+%% License: wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\section{\class{wxList<T>}}\label{wxlist}
+
+The wxList<T> class provides linked list functionality. It has been written
+to be type safe and to provide the full API of the STL std::list container and
+should be used like it. The exception is that wxList<T> actually stores
+pointers and therefore its iterators return pointers and not references
+to the actual objets in the list (see example below). Unfortunately, the
+new wxList<T> class requires that you declare and define each wxList<T>
+class in your program. This is done with {\it WX\_DECLARE\_LIST} and
+{\it WX\_DEFINE\_LIST} macros (see example). We hope that we'll be able
+to provide a proper template class providing both the STL std::list
+and the old wxList API in the future.
+
+Please refer to the STL std::list documentation for further
+information on how to use the class. Below we documented the legacy
+API that originated from the old wxList class and which can still
+be used alternatively for the the same class.
+
+Note that if you compile wxWidgets in STL mode (wxUSE\_STL defined as 1)
+then wxList<T> will actually derive from std::list and just add a legacy
+compatibility layer for the old wxList class.
\wxheading{Example}
... // whatever
};
- // declare our list class: this macro declares and partly implements MyList
- // class (which derives from wxListBase)
+ // this macro declares and partly implements MyList class
WX_DECLARE_LIST(MyListElement, MyList);
...
#include <wx/listimpl.cpp>
WX_DEFINE_LIST(MyList);
- // now MyList class may be used as a usual wxList, but all of its methods
- // will take/return the objects of the right (i.e. MyListElement) type. You
- // also have MyList::Node type which is the type-safe version of wxNode.
+
MyList list;
MyListElement element;
- list.Append(element); // ok
+ list.Append(&element); // ok
list.Append(17); // error: incorrect type
- // let's iterate over the list
- for ( MyList::Node *node = list.GetFirst(); node; node = node->GetNext() )
+ // let's iterate over the list in STL syntax
+ MyList::iterator iter;
+ for (iter = list.begin(); iter != list.end(); ++iter)
+ {
+ MyListElement *current = *iter;
+
+ ...process the current element...
+ }
+
+ // the same with the legacy API from the old wxList class
+ MyList::compatibility_iterator node = list.GetFirst();
+ while (node)
{
MyListElement *current = node->GetData();
...process the current element...
+
+ node = node->GetNext();
}
+
\end{verbatim}
For compatibility with previous versions wxList and wxStringList classes are
still defined, but their usage is deprecated and they will disappear in the
future versions completely. The use of the latter is especially discouraged as
-it is not only unsafe but is also much less efficient than
+it is not only unsafe but is also much less efficient than
\helpref{wxArrayString}{wxarraystring} class.
-In the documentation of the list classes below, the template notations are
-used even though these classes are not really templates at all -- but it helps
-to think about them as if they were. You should replace wxNode<T> with
-wxListName::Node and T itself with the list element type (i.e. the first
-parameter of WX\_DECLARE\_LIST).
-
-\wxheading{Derived from}
-
-\helpref{wxObject}{wxobject}
-
\wxheading{Include files}
<wx/list.h>
-\wxheading{Example}
-
-It is very common to iterate on a list as follows:
-
-\begin{verbatim}
- ...
- wxWindow *win1 = new wxWindow(...);
- wxWindow *win2 = new wxWindow(...);
-
- wxList SomeList;
- SomeList.Append(win1);
- SomeList.Append(win2);
-
- ...
-
- wxNode *node = SomeList.GetFirst();
- while (node)
- {
- wxWindow *win = node->GetData();
- ...
- node = node->GetNext();
- }
-\end{verbatim}
-
-To delete nodes in a list as the list is being traversed, replace
-
-\begin{verbatim}
- ...
- node = node->GetNext();
- ...
-\end{verbatim}
-
-with
+\wxheading{Library}
-\begin{verbatim}
- ...
- delete win;
- delete node;
- node = SomeList.GetFirst();
- ...
-\end{verbatim}
-
-See \helpref{wxNode}{wxnode} for members that retrieve the data associated with a node, and
-members for getting to the next or previous node.
+\helpref{wxBase}{librarieslist}
\wxheading{See also}
-\helpref{wxNode}{wxnode},
\helpref{wxArray}{wxarray}
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxList::wxList}\label{wxlistctor}
-
-\func{}{wxList}{\void}
-
-\func{}{wxList}{\param{int}{ n}, \param{T *}{objects[]}}
-
-\func{}{wxList}{\param{T *}{object}, ...}
-
-{\bf Note}: keyed lists are deprecated and should not be used in new code.
-
-\func{}{wxList}{\param{unsigned int}{ key\_type}}
-
-Constructors. {\it key\_type} is one of wxKEY\_NONE, wxKEY\_INTEGER, or wxKEY\_STRING,
-and indicates what sort of keying is required (if any).
-
-{\it objects} is an array of {\it n} objects with which to initialize the list.
+\membersection{wxList<T>::wxList<T>}\label{wxlistctor}
-The variable-length argument list constructor must be supplied with a
-terminating NULL.
+\func{}{wxList<T>}{\void}
-\membersection{wxList::\destruct{wxList}}\label{wxlistdtor}
+\func{}{wxList<T>}{\param{size\_t}{ count}, \param{T *}{elements[]}}
-\func{}{\destruct{wxList}}{\void}
+Constructors.
-Destroys the list. Also destroys any remaining nodes, but does not destroy
-client data held in the nodes.
+\membersection{wxList<T>::\destruct{wxList<T>}}\label{wxlistdtor}
-\membersection{wxList::Append}\label{wxlistappend}
+\func{}{\destruct{wxList<T>}}{\void}
-\func{wxNode<T> *}{Append}{\param{T *}{object}}
+Destroys the list, but does not delete the objects stored in the list
+unless you called DeleteContents({\tt true} ).
-{\bf Note}: keyed lists are deprecated and should not be used in new code.
+\membersection{wxList<T>::Append}\label{wxlistappend}
-\func{wxNode<T> *}{Append}{\param{long}{ key}, \param{T *}{object}}
+\func{wxList<T>::compatibility\_iterator }{Append}{\param{T *}{object}}
-\func{wxNode<T> *}{Append}{\param{const wxString\& }{key}, \param{T *}{object}}
+Appends the pointer to \rtfsp{\it object} to the list.
-Appends a new \helpref{wxNode}{wxnode} to the end of the list and puts a
-pointer to the \rtfsp{\it object} in the node. The last two forms store a key
-with the object for later retrieval using the key. The new node is returned in
-each case.
-
-The key string is copied and stored by the list implementation.
-
-\membersection{wxList::Clear}\label{wxlistclear}
+\membersection{wxList<T>::Clear}\label{wxlistclear}
\func{void}{Clear}{\void}
-Clears the list (but does not delete the client data stored with each node
-unless you called DeleteContents({\tt true}), in which case it deletes data).
+Clears the list, but does not delete the objects stored in the list
+unless you called DeleteContents({\tt true} ).
-\membersection{wxList::DeleteContents}\label{wxlistdeletecontents}
+\membersection{wxList<T>::DeleteContents}\label{wxlistdeletecontents}
\func{void}{DeleteContents}{\param{bool}{ destroy}}
-If {\it destroy} is {\tt true}, instructs the list to call {\it delete} on the client contents of
-a node whenever the node is destroyed. The default is {\tt false}.
+If {\it destroy} is {\tt true}, instructs the list to call {\it delete}
+on objects stored in the list whenever they are removed.
+The default is {\tt false}.
-\membersection{wxList::DeleteNode}\label{wxlistdeletenode}
+\membersection{wxList<T>::DeleteNode}\label{wxlistdeletenode}
-\func{bool}{DeleteNode}{\param{wxNode<T> *}{node}}
+\func{bool}{DeleteNode}{\param{const compatibility\_iterator &}{iter}}
-Deletes the given node from the list, returning {\tt true} if successful.
+Deletes the given element refered to by {\tt iter} from the list,
+returning {\tt true} if successful.
-\membersection{wxList::DeleteObject}\label{wxlistdeleteobject}
+\membersection{wxList<T>::DeleteObject}\label{wxlistdeleteobject}
\func{bool}{DeleteObject}{\param{T *}{object}}
-Finds the given client {\it object} and deletes the appropriate node from the list, returning
-{\tt true} if successful. The application must delete the actual object separately.
-
-\membersection{wxList::Erase}\label{wxlisterase}
-
-\func{void}{Erase}{\param{wxNode<T> *}{node}}
-
-Removes element at given position.
-
-\membersection{wxList::Find}\label{wxlistfind}
+Finds the given {\it object} and removes it from the list, returning
+{\tt true} if successful. The application must delete the actual object
+separately.
-\func{wxNode<T> *}{Find}{\param{T *}{ object}}
+\membersection{wxList<T>::Erase}\label{wxlisterase}
-Returns the node whose client date is {\it object} or NULL if none found.
+\func{void}{Erase}{\param{const compatibility\_iterator &}{iter}}
-{\bf Note}: keyed lists are deprecated and should not be used in new code.
+Removes element refered to be {\tt iter}.
-\func{wxNode<T> *}{Find}{\param{long}{ key}}
+\membersection{wxList<T>::Find}\label{wxlistfind}
-\func{wxNode<T> *}{Find}{\param{const wxString\& }{key}}
+\constfunc{wxList<T>::compatibility\_iterator}{Find}{\param{T *}{ object}}
-Returns the node whose stored key matches {\it key}. Use on a keyed list only.
+Returns the iterator refering to {\it object} or NULL if none found.
-\membersection{wxList::GetCount}\label{wxlistgetcount}
+\membersection{wxList<T>::GetCount}\label{wxlistgetcount}
\constfunc{size\_t}{GetCount}{\void}
Returns the number of elements in the list.
-\membersection{wxList::GetFirst}\label{wxlistgetfirst}
+\membersection{wxList<T>::GetFirst}\label{wxlistgetfirst}
-\func{wxNode<T> *}{GetFirst}{\void}
+\constfunc{wxList<T>::compatibility\_iterator}{GetFirst}{\void}
-Returns the first node in the list (NULL if the list is empty).
+Returns the first iterator in the list (NULL if the list is empty).
-\membersection{wxList::GetLast}\label{wxlistgetlast}
+\membersection{wxList<T>::GetLast}\label{wxlistgetlast}
-\func{wxNode<T> *}{GetLast}{\void}
+\constfunc{wxList<T>::compatibility\_iterator}{GetLast}{\void}
-Returns the last node in the list (NULL if the list is empty).
+Returns the last iterator in the list (NULL if the list is empty).
-\membersection{wxList::IndexOf}\label{wxlistindexof}
+\membersection{wxList<T>::IndexOf}\label{wxlistindexof}
-\func{int}{IndexOf}{\param{T*}{ obj }}
+\constfunc{int}{IndexOf}{\param{T*}{ obj }}
-Returns the index of {\it obj} within the list or {\tt wxNOT\_FOUND} if {\it obj}
-is not found in the list.
+Returns the index of {\it obj} within the list or {\tt wxNOT\_FOUND} if
+{\it obj} is not found in the list.
-\membersection{wxList::Insert}\label{wxlistinsert}
+\membersection{wxList<T>::Insert}\label{wxlistinsert}
-\func{wxNode<T> *}{Insert}{\param{T *}{object}}
+\func{wxList<T>::compatibility\_iterator}{Insert}{\param{T *}{object}}
-Insert object at front of list.
+Insert object at the front of list.
-\func{wxNode<T> *}{Insert}{\param{size\_t }{position}, \param{T *}{object}}
+\func{wxList<T>::compatibility\_iterator}{Insert}{\param{size\_t }{position}, \param{T *}{object}}
Insert object before {\it position}, i.e. the index of the new item in the
list will be equal to {\it position}. {\it position} should be less than or
equal to \helpref{GetCount}{wxlistgetcount}; if it is equal to it, this is the
same as calling \helpref{Append}{wxlistappend}.
-\func{wxNode<T> *}{Insert}{\param{wxNode<T> *}{node}, \param{T *}{object}}
+\func{wxList<T>::compatibility\_iterator}{Insert}{\param{compatibility\_iterator}{iter}, \param{T *}{object}}
-Inserts the object before the given {\it node}.
+Inserts the object before the object refered to be {\it iter}.
-\membersection{wxList::IsEmpty}\label{wxlistisempty}
+\membersection{wxList<T>::IsEmpty}\label{wxlistisempty}
\constfunc{bool}{IsEmpty}{\void}
Returns {\tt true} if the list is empty, {\tt false} otherwise.
% Use different label name to avoid clashing with wxListItem label
-\membersection{wxList::Item}\label{wxlistitemfunc}
+\membersection{wxList<T>::Item}\label{wxlistitemfunc}
-\constfunc{wxNode<T> *}{Item}{\param{size\_t }{index}}
+\constfunc{wxList<T>::compatibility\_iterator}{Item}{\param{size\_t }{index}}
-Returns the node at given position in the list.
+Returns the iterator refering to the object at the given
+{\tt index} in the list.
-\membersection{wxList::Member}\label{wxlistmember}
+\membersection{wxList<T>::Member}\label{wxlistmember}
-\func{wxNode<T> *}{Member}{\param{T *}{object}}
+\constfunc{wxList<T>::compatibility\_iterator}{Member}{\param{T *}{ object}}
{\bf NB:} This function is deprecated, use \helpref{Find}{wxlistfind} instead.
-Returns the node associated with {\it object} if it is in the list, NULL otherwise.
+\membersection{wxList<T>::Nth}\label{wxlistnth}
-\membersection{wxList::Nth}\label{wxlistnth}
-
-\func{wxNode<T> *}{Nth}{\param{int}{ n}}
+\constfunc{wxList<T>::compatibility\_iterator}{Nth}{\param{int }{n}}
{\bf NB:} This function is deprecated, use \helpref{Item}{wxlistitemfunc} instead.
Returns the {\it nth} node in the list, indexing from zero (NULL if the list is empty
or the nth node could not be found).
-\membersection{wxList::Number}\label{wxlistnumber}
+\membersection{wxList<T>::Number}\label{wxlistnumber}
-\func{int}{Number}{\void}
+\constfunc{int}{Number}{\void}
{\bf NB:} This function is deprecated, use \helpref{GetCount}{wxlistgetcount} instead.
Returns the number of elements in the list.
-\membersection{wxList::Sort}\label{wxlistsort}
+\membersection{wxList<T>::Sort}\label{wxlistsort}
\func{void}{Sort}{\param{wxSortCompareFunction}{ compfunc}}
typedef int (*wxSortCompareFunction)(const void *elem1, const void *elem2);
\end{verbatim}
-Allows the sorting of arbitrary lists by giving
-a function to compare two list elements. We use the system {\bf qsort} function
-for the actual sorting process.
-
-If you use untyped wxList the sort function receives pointers to wxObject
-pointers (wxObject **), so be careful to dereference appropriately - but,
-of course, a better solution is to use list of appropriate type defined with
-{\tt WX\_DECLARE\_LIST}.
-
-Example:
-
-\begin{verbatim}
- int listcompare(const void *arg1, const void *arg2)
- {
- return(compare(**(wxString **)arg1, // use the wxString 'compare'
- **(wxString **)arg2)); // function
- }
-
- void main()
- {
- wxList list;
-
- list.Append(new wxString("DEF"));
- list.Append(new wxString("GHI"));
- list.Append(new wxString("ABC"));
- list.Sort(listcompare);
- }
-\end{verbatim}
+Allows the sorting of arbitrary lists by giving a function to compare
+two list elements. We use the system {\bf qsort} function for the actual
+sorting process.
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