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.
+because wxArrays are used by wxWindows 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).
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
memory allocation routine). However, in a usual situation elements are added to
an array much less often than searched inside it, so wxSortedArray may lead to
huge performance improvements compared to wxArray. Finally, it should be
-noticed that, as wxArray, wxSortedArray can not be used to store anything of
-sizeof() larger than max(sizeof(long), sizeof(void *)) - an assertion failure
-will be raised from the constructor otherwise.
+noticed that, as wxArray, wxSortedArray can be only used for storing integral
+types or pointers.
wxObjArray class treats its elements like "objects". It may delete them when
they are removed from the array (invoking the correct destructor) and copies
...
// now that we have MyDirectory declaration in scope we may finish the
-// definition of ArrayOfDirectories
+// definition of ArrayOfDirectories -- note that this expands into some C++
+// code and so should only be compiled once (i.e., don't put this in the
+// header, but into a source file or you will get linkin errors)
#include <wx/arrimpl.cpp> // this is a magic incantation which must be done!
WX_DEFINE_OBJARRAY(ArrayOfDirectories);
WX\_DEFINE\_OBJARRAY macro.
\helpref{WX\_DEFINE\_ARRAY}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_EXPORTED\_ARRAY}{wxdefinearray}\\
\helpref{WX\_DEFINE\_SORTED\_ARRAY}{wxdefinesortedarray}\\
-\helpref{WX\_DECLARE\_OBJARRAY}{wxdeclareobjarray}\\
+\helpref{WX\_DEFINE\_SORTED\_EXPORTED\_ARRAY}{wxdefinesortedarray}\\
+\helpref{WX\_DECLARE\_EXPORTED\_OBJARRAY}{wxdeclareobjarray}\\
\helpref{WX\_DEFINE\_OBJARRAY}{wxdefineobjarray}
\membersection{Constructors and destructors}
\membersection{Adding items}
\helpref{Add}{wxarrayadd}\\
-\helpref{Insert}{wxarrayinsert}
+\helpref{Insert}{wxarrayinsert}\\
+\helpref{WX\_APPEND\_ARRAY}{wxappendarray}
\membersection{Removing items}
\helpref{WX\_CLEAR\_ARRAY}{wxcleararray}\\
\helpref{Empty}{wxarrayempty}\\
\helpref{Clear}{wxarrayclear}\\
+\helpref{RemoveAt}{wxarrayremoveat}\\
\helpref{Remove}{wxarrayremove}
\membersection{Searching and sorting}
\func{}{WX\_DEFINE\_ARRAY}{\param{}{T}, \param{}{name}}
+\func{}{WX\_DEFINE\_EXPORTED\_ARRAY}{\param{}{T}, \param{}{name}}
+
This macro defines a new array class named {\it name} and containing the
-elements of type {\it T}. Example:
+elements of type {\it T}. The second form is used when compiling DLL
+under Windows and array needs to be visible outside the DLL.
+Example:
\begin{verbatim}
WX_DEFINE_ARRAY(int, wxArrayInt);
\func{}{WX\_DEFINE\_SORTED\_ARRAY}{\param{}{T}, \param{}{name}}
+\func{}{WX\_DEFINE\_SORTED\_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}. Example:
+the elements of type {\it T}. The second form is used when compiling DLL
+under Windows and array needs to be visible outside the DLL.
+
+
+Example:
\begin{verbatim}
-WX_DEFINE_SORTED_ARRAY(int, wxArrayInt);
+WX_DEFINE_SORTED_ARRAY(int, wxSortedArrayInt);
class MyClass;
WX_DEFINE_SORTED_ARRAY(MyClass *, wxArrayOfMyClass);
return n1 - n2;
}
-wxArrayInt sorted(CompareInts);
+wxSortedArrayInt sorted(CompareInts);
int CompareMyClassObjects(MyClass *item1, MyClass *item2)
{
\func{}{WX\_DECLARE\_OBJARRAY}{\param{}{T}, \param{}{name}}
+\func{}{WX\_DECLARE\_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}. Example:
+the elements of type {\it T}. The second form is used when compiling DLL
+under Windows and array needs to be visible outside the DLL.
+
+Example:
\begin{verbatim}
class MyClass;
WX_DEFINE_OBJARRAY(wxArrayOfMyClass);
\end{verbatim}
+\membersection{WX\_APPEND\_ARRAY}\label{wxappendarray}
+
+\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
+{\it array}. The two arrays must be of the same type.
+
\membersection{WX\_CLEAR\_ARRAY}\label{wxcleararray}
-\func{\void}{WX\_CLEAR\_ARRAY}{\param{wxArray\& }{array}}
+\func{void}{WX\_CLEAR\_ARRAY}{\param{wxArray\& }{array}}
This macro may be used to delete all elements of the array before emptying it.
It can not be used with wxObjArrays - but they will delete their elements anyhow
\membersection{Default constructors}\label{wxarrayctordef}
-\func{}{wxArray}{}
+\func{}{wxArray}{\void}
-\func{}{wxObjArray}{}
+\func{}{wxObjArray}{\void}
Default constructor initializes an empty array object.
\membersection{wxArray::Add}\label{wxarrayadd}
-\func{\void}{Add}{\param{T }{item}}
+\func{void}{Add}{\param{T }{item}}
-\func{\void}{Add}{\param{T *}{item}}
+\func{void}{Add}{\param{T *}{item}}
-\func{\void}{Add}{\param{T \&}{item}}
+\func{void}{Add}{\param{T \&}{item}}
Appends a new element to the array (where {\it T} is the type of the array
elements.)
The first version is used with wxArray and wxSortedArray. The second and the
-third are used with wxObjArray. There is an {\bf important difference} between
+third 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
ownership of the original item. Once again, it only makes sense for wxObjArrays
because the other array types never take ownership of their elements.
+You may also use \helpref{WX\_APPEND\_ARRAY}{wxappendarray} macro to append all
+elements of one array to another one.
+
\membersection{wxArray::Alloc}\label{wxarrayalloc}
-\func{\void}{Alloc}{\param{size\_t }{count}}
+\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
\membersection{wxArray::Clear}\label{wxarrayclear}
-\func{\void}{Clear}{\void}
+\func{void}{Clear}{\void}
This function does the same as \helpref{Empty()}{wxarrayempty} and additionally
frees the memory allocated to the array.
\func{T *}{Detach}{\param{size\_t }{index}}
Removes the element from the array, but, unlike,
-
\helpref{Remove()}{wxarrayremove} doesn't delete it. The function returns the
pointer to the removed element.
\membersection{wxArray::Empty}\label{wxarrayempty}
-\func{\void}{Empty}{\void}
+\func{void}{Empty}{\void}
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::Insert}\label{wxarrayinsert}
-\func{\void}{Insert}{\param{T }{item}, \param{size\_t }{n}}
+\func{void}{Insert}{\param{T }{item}, \param{size\_t }{n}}
-\func{\void}{Insert}{\param{T *}{item}, \param{size\_t }{n}}
+\func{void}{Insert}{\param{T *}{item}, \param{size\_t }{n}}
-\func{\void}{Insert}{\param{T \&}{item}, \param{size\_t }{n}}
+\func{void}{Insert}{\param{T \&}{item}, \param{size\_t }{n}}
-Insert a new item into the array before the item {\it n} - thus, {\it
-Insert(something, 0u}} will insert an item in such way that it will become the
+Insert a new item into the array before the item {\it n} - thus, {\it Insert(something, 0u)} will
+insert an item in such way that it will become the
first array element.
Please see \helpref{Add()}{wxarrayadd} for explanation of the differences
\membersection{wxArray::IsEmpty}\label{wxarrayisempty}
-\constfunc{bool}{IsEmpty}{}
+\constfunc{bool}{IsEmpty}{\void}
Returns TRUE if the array is empty, FALSE otherwise.
\membersection{wxArray::Remove}\label{wxarrayremove}
-\func{\void}{Remove}{\param{size\_t }{index}}
-
\func{\void}{Remove}{\param{T }{item}}
-Removes the element from the array either by index or by value. When an element
-is removed from wxObjArray it is deleted by the array - use
+Removes the element from the array either by value: the first item of the
+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
\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 the it manually if required:
See also \helpref{WX\_CLEAR\_ARRAY}{wxcleararray} macro which deletes all
elements of a wxArray (supposed to contain pointers).
+\membersection{wxArray::RemoveAt}\label{wxarrayremoveat}
+
+\func{\void}{RemoveAt}{\param{size\_t }{index}}
+
+Removes the element from the array either by index. 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 the it manually if required:
+
+\begin{verbatim}
+T *item = array[n];
+delete item;
+array.RemoveAt(n)
+\end{verbatim}
+
+See also \helpref{WX\_CLEAR\_ARRAY}{wxcleararray} macro which deletes all
+elements of a wxArray (supposed to contain pointers).
+
\membersection{wxArray::Shrink}\label{wxarrayshrink}
-\func{\void}{Shrink}{\void}
+\func{void}{Shrink}{\void}
Frees all memory unused by the array. If the program knows that no new items
will be added to the array it may call Shrink() to reduce its memory usage.
\membersection{wxArray::Sort}\label{wxarraysort}
-\func{\void}{Sort}{\param{CMPFUNC<T> }{compareFunction}}
+\func{void}{Sort}{\param{CMPFUNC<T> }{compareFunction}}
The notation CMPFUNC<T> should be read as if we had the following declaration:
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
projects / wxWidgets.git / blobdiff