-\section{\class{wxArray}}\label{wxarray}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name: array.tex
+%% Purpose: wxArray
+%% Author: wxWidgets Team
+%% Modified by:
+%% Created:
+%% RCS-ID: $Id$
+%% Copyright: (c) wxWidgets Team
+%% License: wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\section{\class{wxArray<T>}}\label{wxarray}
This section describes the so called {\it dynamic arrays}. This is a C
-array-like data structure i.e. the member access time is constant (and not
+array-like type safe data structure i.e. the member access time is constant (and not
linear according to the number of container elements as for linked lists). However, these
arrays are dynamic in the sense that they will automatically allocate more
memory if there is not enough of it for adding a new element. They also perform
you may find some useful hints about optimizing wxArray memory usage. As for executable size, all
wxArray functions are inline, so they do not take {\it any space at all}.
-wxWindows has three different kinds of array. All of them derive from
+wxWidgets has three different kinds of array. All of them derive from
wxBaseArray class which works with untyped data and can not be used directly.
The standard macros WX\_DEFINE\_ARRAY(), WX\_DEFINE\_SORTED\_ARRAY() and
WX\_DEFINE\_OBJARRAY() are used to define a new class deriving from it. The
all of wxArray's functions are inline, so it costs strictly nothing to define as
many array types as you want (either in terms of the executable size or the
speed) as long as at least one of them is defined and this is always the case
-because wxArrays are used by wxWindows internally. This class has one serious
+because wxArrays are used by wxWidgets internally. This class has one serious
limitation: it can only be used for storing integral types (bool, char, short,
int, long and their unsigned variants) or pointers (of any kind). An attempt
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 wxWindows).
+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}
but is not that complicated and allows the code to be compiled with any, however
dumb, C++ compiler in the world.
+Remember to #include <wx/arrimpl.cpp> just before each WX\_DEFINE\_OBJARRAY
+ocurrence in your code, even if you have several in the same file.
+
Things are much simpler for wxArray and wxSortedArray however: it is enough
just to write
-\begin{verbatim}
-WX_DEFINE_ARRAY(MyDirectory *, ArrayOfDirectories);
-WX_DEFINE_SORTED_ARRAY(MyFile *, ArrayOfFiles);
+\begin{verbatim}
+WX_DEFINE_ARRAY_INT(int, ArrayOfInts);
+WX_DEFINE_SORTED_ARRAY_INT(int, ArrayOfSortedInts);
\end{verbatim}
-\wxheading{See also:}
+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}
-\helpref{Container classes overview}{wxcontaineroverview}, \helpref{wxList}{wxlist}
+\helpref{Container classes overview}{wxcontaineroverview},
+\helpref{wxList<T>}{wxlist},
+\helpref{wxVector<T>}{wxvector}
\wxheading{Include files}
<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}
+\membersection{Macros for template array definition}\label{arraymacros}
To use an array you must first define the array class. This is done with the
help of the macros in this section. The class of array elements must be (at
\helpref{WX\_DEFINE\_EXPORTED\_OBJARRAY}{wxdefineobjarray}\\
\helpref{WX\_DEFINE\_USER\_EXPORTED\_OBJARRAY}{wxdefineobjarray}
-\membersection{Constructors and destructors}
+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
+{\tt \_PTR} versions of the macros above. For example, to define an array of
+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 separate macros for declaring an array of a simple type,
+such as an int.
+
+The following simple types are supported:\\
+int\\
+long\\
+size\_t\\
+double
+
+To create an array of a simple type, simply append the type you want in CAPS to
+the array definition.
+
+For example, for an integer array, you'd use one of the following variants:
+
+\helpref{WX\_DEFINE\_ARRAY\_INT}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_EXPORTED\_ARRAY\_INT}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_USER\_EXPORTED\_ARRAY\_INT}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_SORTED\_ARRAY\_INT}{wxdefinesortedarray}\\
+\helpref{WX\_DEFINE\_SORTED\_EXPORTED\_ARRAY\_INT}{wxdefinesortedarray}\\
+\helpref{WX\_DEFINE\_SORTED\_USER\_EXPORTED\_ARRAY\_INT}{wxdefinesortedarray}\\
+
+\membersection{Constructors and destructors}\label{arrayconstructorsdestructors}
Array classes are 100\% C++ objects and as such they have the appropriate copy
constructors and assignment operators. Copying wxArray just copies the elements
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.
\helpref{Alloc}{wxarrayalloc}\\
\helpref{Shrink}{wxarrayshrink}
-\membersection{Number of elements and simple item access}
+\membersection{Number of elements and simple item access}\label{arrayelementsaccess}
Functions in this section return the total number of array elements and allow to
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{Last}{wxarraylast}
-\membersection{Adding items}
+\membersection{Adding items}\label{arrayadding}
\helpref{Add}{wxarrayadd}\\
+\helpref{AddAt}{wxarrayaddat}\\
\helpref{Insert}{wxarrayinsert}\\
\helpref{SetCount}{wxarraysetcount}\\
-\helpref{WX\_APPEND\_ARRAY}{wxappendarray}
+\helpref{WX\_APPEND\_ARRAY}{wxappendarray}\\
+\helpref{WX\_PREPEND\_ARRAY}{wxprependarray}
-\membersection{Removing items}
+\membersection{Removing items}\label{arrayremoving}
\helpref{WX\_CLEAR\_ARRAY}{wxcleararray}\\
\helpref{Empty}{wxarrayempty}\\
\helpref{RemoveAt}{wxarrayremoveat}\\
\helpref{Remove}{wxarrayremove}
-\membersection{Searching and sorting}
+\membersection{Searching and sorting}\label{arraysearchingandsorting}
\helpref{Index}{wxarrayindex}\\
+\helpref{IndexForInsert}{wxarrayindexforinsert}\\
\helpref{Sort}{wxarraysort}
%%%%% MEMBERS HERE %%%%%
\func{}{WX\_DEFINE\_USER\_EXPORTED\_ARRAY}{\param{}{T}, \param{}{name}, \param{}{exportspec}}
This macro defines a new array class named {\it name} and containing the
-elements of type {\it T}. The second form is used when compiling wxWindows as
+elements of type {\it T}. The second form is used when compiling wxWidgets as
a DLL under Windows and array needs to be visible outside the DLL. The third is
needed for exporting an array from a user DLL.
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 wxWindows 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}
\func{}{WX\_DEFINE\_SORTED\_USER\_EXPORTED\_ARRAY}{\param{}{T}, \param{}{name}}
This macro defines a new sorted array class named {\it name} and containing
-the elements of type {\it T}. The second form is used when compiling wxWindows as
+the elements of type {\it T}. The second form is used when compiling wxWidgets as
a DLL under Windows and array needs to be visible outside the DLL. The third is
needed for exporting an array from a user DLL.
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
return n1 - n2;
}
-wxSortedArrayInt sorted(CompareInts);
+MySortedArrayInt sorted(CompareInts);
int CompareMyClassObjects(MyClass *item1, MyClass *item2)
{
return Stricmp(item1->GetAddress(), item2->GetAddress());
}
-wxArrayOfMyClass another(CompareMyClassObjects);
+ArrayOfMyClass another(CompareMyClassObjects);
\end{verbatim}
\membersection{WX\_DECLARE\_OBJARRAY}\label{wxdeclareobjarray}
\func{}{WX\_DECLARE\_USER\_EXPORTED\_OBJARRAY}{\param{}{T}, \param{}{name}}
This macro declares a new object array class named {\it name} and containing
-the elements of type {\it T}. The second form is used when compiling wxWindows as
+the elements of type {\it T}. The second form is used when compiling wxWidgets as
a DLL under Windows and array needs to be visible outside the DLL. The third is
needed for exporting an array from a user DLL.
\begin{verbatim}
class MyClass;
-WX_DEFINE_OBJARRAY(MyClass, wxArrayOfMyClass); // note: not "MyClass *"!
+WX_DECLARE_OBJARRAY(MyClass, wxArrayOfMyClass); // note: not "MyClass *"!
\end{verbatim}
You must use \helpref{WX\_DEFINE\_OBJARRAY()}{wxdefineobjarray} macro to define
\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}
\func{void}{Add}{\param{T }{item}, \param{size\_t}{ copies = $1$}}
+\func{size\_t}{Add}{\param{T }{item}}
+
\func{void}{Add}{\param{T *}{item}}
\func{void}{Add}{\param{T \&}{item}, \param{size\_t}{ copies = $1$}}
Appends the given number of {\it copies} of the {\it item} to the array
consisting of the elements of type {\it T}.
-The first version is used with wxArray and wxSortedArray. The second and the
-third are used with wxObjArray. There is an important difference between
+The first version is used with wxArray. The second is used with wxSortedArray,
+returning the index where {\it item} is stored. The third and the
+fourth ones are used with wxObjArray. There is an important difference between
them: if you give a pointer to the array, it will take ownership of it, i.e.
will delete it when the item is deleted from the array. If you give a reference
to the array, however, the array will make a copy of the item and will not take
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.
+\membersection{wxSortedArray::AddAt}\label{wxarrayaddat}
+
+\func{void}{AddAt}{\param{T }{item}, \param{size\_t}{ index}}
+
+Inserts the given {\it item} into the array in the specified {\it index}
+ position.
+
+Be aware that you will set out the order of the array if you give a wrong
+ position.
+
+This function is useful in conjunction with
+\helpref{IndexForInsert}{wxarrayindexforinsert} for a common operation
+of "insert only if not found".
+
\membersection{wxArray::Alloc}\label{wxarrayalloc}
\func{void}{Alloc}{\param{size\_t }{count}}
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.
Searches the element in the array, starting from either beginning or the end
-depending on the value of {\it searchFromEnd} parameter. wxNOT\_FOUND is
+depending on the value of {\it searchFromEnd} parameter. {\tt wxNOT\_FOUND} is
returned if the element is not found, otherwise the index of the element is
returned.
previously added to the array, but fail even if another, identical, element is
in the array.
+\membersection{wxSortedArray::IndexForInsert}\label{wxarrayindexforinsert}
+
+\constfunc{size\_t}{IndexForInsert}{\param{T }{item}}
+
+Search for a place to insert {\it item} into the sorted array (binary search).
+The index returned is just before the first existing item that is greater or equal
+(according to the compare function) to the given {\it item}.
+
+You have to do extra work to know if the {\it item} already exists in array.
+
+This function is useful in conjunction with
+\helpref{AddAt}{wxarrayaddat} for a common operation
+of "insert only if not found".
+
\membersection{wxArray::Insert}\label{wxarrayinsert}
\func{void}{Insert}{\param{T }{item}, \param{size\_t }{n}, \param{size\_t }{copies = $1$}}
the existing item {\it n} - thus, {\it Insert(something, 0u)} will insert an
item in such way that it will become the first array element.
+wxSortedArray doesn't have this function because inserting in wrong place
+would break its sorted condition.
+
Please see \helpref{Add()}{wxarrayadd} for explanation of the differences
between the overloaded versions of this function.
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
-{\it count}. If the array has already {\it count} or mroe items, nothing is
+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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