+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name: array.tex
+%% Purpose: wxArray
+%% Author: wxWidgets Team
+%% Modified by:
+%% Created:
+%% RCS-ID: $Id$
+%% Copyright: (c) wxWidgets Team
+%% License: wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
\section{\class{wxArray}}\label{wxarray}
This section describes the so called {\it dynamic arrays}. This is a C
to use with objects of sizeof() greater than sizeof(long) will provoke a
runtime assertion failure, however declaring a wxArray of floats will not (on
the machines where sizeof(float) <= sizeof(long)), yet it will {\bf not} work,
-please use wxObjArray for storing floats and doubles (NB: a more efficient
-wxArrayDouble class is scheduled for the next release of wxWidgets).
+please use wxObjArray for storing floats and doubles.
wxSortedArray is a wxArray variant which should be used when searching in the
array is a frequently used operation. It requires you to define an additional
function for comparing two elements of the array element type and always stores
-its items in the sorted order (according to this function). Thus, it is
+its items in the sorted order (according to this function). Thus, it is
\helpref{Index()}{wxarrayindex} function execution time is $O(log(N))$ instead of
$O(N)$ for the usual arrays but the \helpref{Add()}{wxarrayadd} method is
slower: it is $O(log(N))$ instead of constant time (neglecting time spent in
It is not as elegant as writing
-\begin{verbatim}
+\begin{verbatim}
typedef std::vector<MyDirectory> ArrayOfDirectories;
\end{verbatim}
Things are much simpler for wxArray and wxSortedArray however: it is enough
just to write
-\begin{verbatim}
-WX_DEFINE_ARRAY(int, ArrayOfDirectories);
-WX_DEFINE_SORTED_ARRAY(int, ArrayOfFiles);
+\begin{verbatim}
+WX_DEFINE_ARRAY_INT(int, ArrayOfInts);
+WX_DEFINE_SORTED_ARRAY_INT(int, ArrayOfSortedInts);
\end{verbatim}
-i.e. there is only one {\tt DEFINE} macro and no need for separate
-{\tt DECLARE} one.
+i.e. there is only one {\tt DEFINE} macro and no need for separate
+{\tt DECLARE} one. For the arrays of the primitive types, the macros
+{\tt WX\_DEFINE\_ARRAY\_CHAR/SHORT/INT/SIZE\_T/LONG/DOUBLE} should be used
+depending on the sizeof of the values (notice that storing values of smaller
+type, e.g. shorts, in an array of larger one, e.g. {\tt ARRAY\_INT}, does
+\emph{not} work on all architectures!).
-\wxheading{See also:}
+\wxheading{See also}
\helpref{Container classes overview}{wxcontaineroverview}, \helpref{wxList}{wxlist}
<wx/dynarray.h> for wxArray and wxSortedArray and additionally <wx/arrimpl.cpp>
for wxObjArray.
+\wxheading{Library}
+
+\helpref{wxBase}{librarieslist}
+
+
+
+
\latexignore{\rtfignore{\wxheading{Function groups}}}
\membersection{Macros for template array definition}\label{arraymacros}
To slightly complicate the matters even further, the operator $->$ defined by
default for the array iterators by these macros only makes sense if the array
element type is not a pointer itself and, although it still works, this
-provokes warnings from some compilers and to avoid them you should use the
+provokes warnings from some compilers and to avoid them you should use the
{\tt \_PTR} versions of the macros above. For example, to define an array of
-pointers to {\tt double} you should use.
+pointers to {\tt double} you should use:
+
+\begin{verbatim}
+WX_DEFINE_ARRAY_PTR(double *, MyArrayOfDoublePointers);
+\end{verbatim}
-Note that the above macros are generally only useful for
-wxObject types. There are seperate macros for declaring an array of a simple type,
+Note that the above macros are generally only useful for
+wxObject types. There are separate macros for declaring an array of a simple type,
such as an int.
The following simple types are supported:\\
\helpref{WX\_DEFINE\_SORTED\_EXPORTED\_ARRAY\_INT}{wxdefinesortedarray}\\
\helpref{WX\_DEFINE\_SORTED\_USER\_EXPORTED\_ARRAY\_INT}{wxdefinesortedarray}\\
-\begin{verbatim}
-WX_DEFINE_ARRAY_PTR(double *, MyArrayOfDoublePointers);
-\end{verbatim}
-
\membersection{Constructors and destructors}\label{arrayconstructorsdestructors}
Array classes are 100\% C++ objects and as such they have the appropriate copy
ARRAY\_MAXSIZE\_INCREMENT constant. Of course, this may lead to some memory
being wasted (ARRAY\_MAXSIZE\_INCREMENT in the worst case, i.e. 4Kb in the
current implementation), so the \helpref{Shrink()}{wxarrayshrink} function is
-provided to deallocate the extra memory. The \helpref{Alloc()}{wxarrayalloc}
+provided to deallocate the extra memory. The \helpref{Alloc()}{wxarrayalloc}
function can also be quite useful if you know in advance how many items you are
going to put in the array and will prevent the array code from reallocating the
memory more times than needed.
retrieve them - possibly using just the C array indexing $[]$ operator which
does exactly the same as \helpref{Item()}{wxarrayitem} method.
-\helpref{Count}{wxarraycount}\\
\helpref{GetCount}{wxarraygetcount}\\
\helpref{IsEmpty}{wxarrayisempty}\\
\helpref{Item}{wxarrayitem}\\
\helpref{Add}{wxarrayadd}\\
\helpref{Insert}{wxarrayinsert}\\
\helpref{SetCount}{wxarraysetcount}\\
-\helpref{WX\_APPEND\_ARRAY}{wxappendarray}
+\helpref{WX\_APPEND\_ARRAY}{wxappendarray}\\
+\helpref{WX\_PREPEND\_ARRAY}{wxprependarray}
\membersection{Removing items}\label{arrayremoving}
Example:
\begin{verbatim}
-WX_DEFINE_ARRAY_INT(wxArrayInt);
+WX_DEFINE_ARRAY_INT(int, MyArrayInt);
class MyClass;
-WX_DEFINE_ARRAY(MyClass *, wxArrayOfMyClass);
+WX_DEFINE_ARRAY(MyClass *, ArrayOfMyClass);
\end{verbatim}
-Note that wxWidgets predefines the following standard array classes: wxArrayInt,
-wxArrayLong and wxArrayPtrVoid.
+Note that wxWidgets predefines the following standard array classes: {\bf wxArrayInt},
+{\bf wxArrayLong}, {\bf wxArrayShort}, {\bf wxArrayDouble}, {\bf wxArrayPtrVoid}.
+
\membersection{WX\_DEFINE\_SORTED\_ARRAY}\label{wxdefinesortedarray}
Example:
\begin{verbatim}
-WX_DEFINE_SORTED_ARRAY_INT(wxSortedArrayInt);
+WX_DEFINE_SORTED_ARRAY_INT(int, MySortedArrayInt);
class MyClass;
-WX_DEFINE_SORTED_ARRAY(MyClass *, wxArrayOfMyClass);
+WX_DEFINE_SORTED_ARRAY(MyClass *, ArrayOfMyClass);
\end{verbatim}
You will have to initialize the objects of this class by passing a comparison
\func{}{WX\_DEFINE\_USER\_EXPORTED\_OBJARRAY}{\param{}{name}}
-This macro defines the methods of the array class {\it name} not defined by the
+This macro defines the methods of the array class {\it name} not defined by the
\helpref{WX\_DECLARE\_OBJARRAY()}{wxdeclareobjarray} macro. You must include the
file <wx/arrimpl.cpp> before using this macro and you must have the full
-declaration of the class of array elements in scope! If you forget to do the
+declaration of the class of array elements in scope! If you forget to do the
first, the error will be caught by the compiler, but, unfortunately, many
compilers will not give any warnings if you forget to do the second - but the
objects of the class will not be copied correctly and their real destructor will
\func{void}{WX\_APPEND\_ARRAY}{\param{wxArray\& }{array}, \param{wxArray\& }{other}}
-This macro may be used to append all elements of the {\it other} array to the
+This macro may be used to append all elements of the {\it other} array to the
+{\it array}. The two arrays must be of the same type.
+
+\membersection{WX\_PREPEND\_ARRAY}\label{wxprependarray}
+
+\func{void}{WX\_PREPEND\_ARRAY}{\param{wxArray\& }{array}, \param{wxArray\& }{other}}
+
+This macro may be used to prepend all elements of the {\it other} array to the
{\it array}. The two arrays must be of the same type.
\membersection{WX\_CLEAR\_ARRAY}\label{wxcleararray}
\func{}{\destruct{wxObjArray}}{\void}
The wxObjArray destructor deletes all the items owned by the array. This is not
-done by wxArray and wxSortedArray versions - you may use
+done by wxArray and wxSortedArray versions - you may use
\helpref{WX\_CLEAR\_ARRAY}{wxcleararray} macro for this.
\membersection{wxArray::Add}\label{wxarrayadd}
deleting it twice (or more) and hence to a crash.
You may also use \helpref{WX\_APPEND\_ARRAY}{wxappendarray} macro to append all
-elements of one array to another one but it is more efficient to use
+elements of one array to another one but it is more efficient to use
{\it copies} parameter and modify the elements in place later if you plan to
append a lot of items.
Preallocates memory for a given number of array elements. It is worth calling
when the number of items which are going to be added to the array is known in
advance because it will save unneeded memory reallocation. If the array already
-has enough memory for the given number of items, nothing happens.
+has enough memory for the given number of items, nothing happens. In any case,
+the existing contents of the array is not modified.
\membersection{wxArray::Clear}\label{wxarrayclear}
This function does the same as \helpref{Empty()}{wxarrayempty} and additionally
frees the memory allocated to the array.
-\membersection{wxArray::Count}\label{wxarraycount}
-
-\constfunc{size\_t}{Count}{\void}
-
-Same as \helpref{GetCount()}{wxarraygetcount}. This function is deprecated -
-it exists only for compatibility.
-
\membersection{wxObjArray::Detach}\label{wxobjarraydetach}
\func{T *}{Detach}{\param{size\_t }{index}}
-Removes the element from the array, but, unlike,
+Removes the element from the array, but, unlike,
\helpref{Remove()}{wxarrayremove} doesn't delete it. The function returns the
pointer to the removed element.
Empties the array. For wxObjArray classes, this destroys all of the array
elements. For wxArray and wxSortedArray this does nothing except marking the
-array of being empty - this function does not free the allocated memory, use
+array of being empty - this function does not free the allocated memory, use
\helpref{Clear()}{wxarrayclear} for this.
\membersection{wxArray::GetCount}\label{wxarraygetcount}
\membersection{wxArray::Index}\label{wxarrayindex}
-\func{int}{Index}{\param{T\& }{item}, \param{bool }{searchFromEnd = false}}
+\constfunc{int}{Index}{\param{T\& }{item}, \param{bool }{searchFromEnd = false}}
-\func{int}{Index}{\param{T\& }{item}}
+\constfunc{int}{Index}{\param{T\& }{item}}
The first version of the function is for wxArray and wxObjArray, the second is
for wxSortedArray only.
array equal to {\it item} is removed, an assert failure will result from an
attempt to remove an item which doesn't exist in the array.
-When an element is removed from wxObjArray it is deleted by the array - use
+When an element is removed from wxObjArray it is deleted by the array - use
\helpref{Detach()}{wxobjarraydetach} if you don't want this to happen. On the
other hand, when an object is removed from a wxArray nothing happens - you
should delete it manually if required:
\func{void}{SetCount}{\param{size\_t }{count}, \param{T }{defval = T($0$)}}
-This function ensures that the number of array elements is at least
+This function ensures that the number of array elements is at least
{\it count}. If the array has already {\it count} or more items, nothing is
done. Otherwise, {\tt count - GetCount()} elements are added and initialized to
the value {\it defval}.
template int CMPFUNC(T *first, T *second);
\end{verbatim}
-where {\it T} is the type of the array elements. I.e. it is a function returning
+where {\it T} is the type of the array elements. I.e. it is a function returning
{\it int} which is passed two arguments of type {\it T *}.
Sorts the array using the specified compare function: this function should
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