X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d1b5756b71267e8c5b123dc868e38034e57ff0d5..ded4fa5b7a2a8177a6905b9b0fcda1d3dac2d0ff:/docs/latex/wx/array.tex

diff --git a/docs/latex/wx/array.tex b/docs/latex/wx/array.tex
index f4d712e9ab..1bb7d0f338 100644
--- a/docs/latex/wx/array.tex
+++ b/docs/latex/wx/array.tex
@@ -2,7 +2,7 @@
 
 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
-linear in number of container elements as for linked lists). However, these
+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
 range checking on the index values but in debug mode only, so please be sure to
@@ -15,7 +15,7 @@ release build.
 
 The array classes were designed to be reasonably efficient, both in terms of
 run-time speed and memory consumption and the executable size. The speed of
-array item access if, of course, constant (independent of number of elements)
+array item access is, of course, constant (independent of the number of elements)
 making them much more efficient than linked lists (\helpref{wxList}{wxlist}).
 Adding items to the arrays is also implemented in more or less constant time -
 but the price is preallocating the memory in advance. In the \helpref{memory management}{wxarraymemorymanagement} section
@@ -35,25 +35,31 @@ element type.
 
 wxArray is suitable for storing integer types and pointers which it does not
 treat as objects in any way, i.e. the element pointed to by the pointer is not
-deleted when the element is removed from the array \&c. It should be noted that
-all of wxArray functions are inline, so it costs strictly nothing to define as
+deleted when the element is removed from the array. It should be noted that
+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
 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's 
+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
 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
@@ -69,7 +75,7 @@ example:
 \begin{verbatim}
 #include <wx/dynarray.h>
 
-// we must forward declare the array because it's used inside the class
+// we must forward declare the array because it is used inside the class
 // declaration
 class MyDirectory;
 class MyFile;
@@ -89,12 +95,13 @@ class MyDirectory
 ...
 
 // 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);
 
 // that's all!
-
 \end{verbatim}
 
 It is not as elegant as writing
@@ -106,7 +113,7 @@ typedef std::vector<MyDirectory> ArrayOfDirectories;
 but is not that complicated and allows the code to be compiled with any, however
 dumb, C++ compiler in the world.
 
-The things are much simpler for wxArray and wxSortedArray however: it is enough
+Things are much simpler for wxArray and wxSortedArray however: it is enough
 just to write
 
 \begin{verbatim} 
@@ -118,7 +125,7 @@ WX_DEFINE_SORTED_ARRAY(MyFile *, ArrayOfFiles);
 
 \helpref{Container classes overview}{wxcontaineroverview}, \helpref{wxList}{wxlist}
 
-\wxheading{Required headers:}
+\wxheading{Include files}
 
 <wx/dynarray.h> for wxArray and wxSortedArray and additionally <wx/arrimpl.cpp>
 for wxObjArray.
@@ -134,9 +141,16 @@ WX\_DECLARE\_OBJARRAY macros and must be fully declared before you use
 WX\_DEFINE\_OBJARRAY macro.
 
 \helpref{WX\_DEFINE\_ARRAY}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_EXPORTED\_ARRAY}{wxdefinearray}\\
+\helpref{WX\_DEFINE\_USER\_EXPORTED\_ARRAY}{wxdefinearray}\\
 \helpref{WX\_DEFINE\_SORTED\_ARRAY}{wxdefinesortedarray}\\
-\helpref{WX\_DECLARE\_OBJARRAY}{wxdeclareobjarray}\\
-\helpref{WX\_DEFINE\_OBJARRAY}{wxdefineobjarray}
+\helpref{WX\_DEFINE\_SORTED\_EXPORTED\_ARRAY}{wxdefinesortedarray}\\
+\helpref{WX\_DEFINE\_SORTED\_USER\_EXPORTED\_ARRAY}{wxdefinesortedarray}\\
+\helpref{WX\_DECLARE\_EXPORTED\_OBJARRAY}{wxdeclareobjarray}\\
+\helpref{WX\_DECLARE\_USER\_EXPORTED\_OBJARRAY}{wxdeclareobjarray}\\
+\helpref{WX\_DEFINE\_OBJARRAY}{wxdefineobjarray}\\
+\helpref{WX\_DEFINE\_EXPORTED\_OBJARRAY}{wxdefineobjarray}\\
+\helpref{WX\_DEFINE\_USER\_EXPORTED\_OBJARRAY}{wxdefineobjarray}
 
 \membersection{Constructors and destructors}
 
@@ -186,13 +200,15 @@ does exactly the same as \helpref{Item()}{wxarrayitem} method.
 \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}
@@ -209,10 +225,18 @@ does exactly the same as \helpref{Item()}{wxarrayitem} method.
 
 \membersection{WX\_DEFINE\_ARRAY}\label{wxdefinearray}
 
-\func{}{WX\_DEFINE\_ARRAY}{\param{}{T}, \param{name}}
+\func{}{WX\_DEFINE\_ARRAY}{\param{}{T}, \param{}{name}}
+
+\func{}{WX\_DEFINE\_EXPORTED\_ARRAY}{\param{}{T}, \param{}{name}}
+
+\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}. Example:
+elements of type {\it T}. The second form is used when compiling wxWindows 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);
@@ -228,25 +252,34 @@ wxArrayLong and wxArrayPtrVoid.
 
 \func{}{WX\_DEFINE\_SORTED\_ARRAY}{\param{}{T}, \param{}{name}}
 
+\func{}{WX\_DEFINE\_SORTED\_EXPORTED\_ARRAY}{\param{}{T}, \param{}{name}}
+
+\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}. Example:
+the elements of type {\it T}. The second form is used when compiling wxWindows 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, wxArrayInt);
+WX_DEFINE_SORTED_ARRAY(int, wxSortedArrayInt);
 
 class MyClass;
 WX_DEFINE_SORTED_ARRAY(MyClass *, wxArrayOfMyClass);
 \end{verbatim}
 
-You will have to initialize the objects of this class by passing a comparaison
+You will have to initialize the objects of this class by passing a comparison
 function to the array object constructor like this:
+
 \begin{verbatim}
 int CompareInts(int n1, int n2)
 {
     return n1 - n2;
 }
 
-wxArrayInt sorted(CompareInts);
+wxSortedArrayInt sorted(CompareInts);
 
 int CompareMyClassObjects(MyClass *item1, MyClass *item2)
 {
@@ -261,12 +294,22 @@ wxArrayOfMyClass another(CompareMyClassObjects);
 
 \func{}{WX\_DECLARE\_OBJARRAY}{\param{}{T}, \param{}{name}}
 
+\func{}{WX\_DECLARE\_EXPORTED\_OBJARRAY}{\param{}{T}, \param{}{name}}
+
+\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}. Example:
+the elements of type {\it T}. The second form is used when compiling wxWindows 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}
 class MyClass;
 WX_DEFINE_OBJARRAY(MyClass, wxArrayOfMyClass); // note: not "MyClass *"!
 \end{verbatim}
+
 You must use \helpref{WX\_DEFINE\_OBJARRAY()}{wxdefineobjarray} macro to define
 the array class - otherwise you would get link errors.
 
@@ -274,6 +317,10 @@ the array class - otherwise you would get link errors.
 
 \func{}{WX\_DEFINE\_OBJARRAY}{\param{}{name}}
 
+\func{}{WX\_DEFINE\_EXPORTED\_OBJARRAY}{\param{}{name}}
+
+\func{}{WX\_DEFINE\_USER\_EXPORTED\_OBJARRAY}{\param{}{name}}
+
 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
@@ -281,7 +328,8 @@ 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
-not be called.
+not be called.  The latter two forms are merely aliases of the first to satisfy
+some people's sense of symmetry when using the exported declarations.
 
 Example of usage:
 
@@ -301,31 +349,38 @@ public:
 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
 when you call Empty().
 
-\membersection{Default constructors}\label{wxarrayctor}
+\membersection{Default constructors}\label{wxarrayctordef}
 
-\func{}{wxArray}{}
+\func{}{wxArray}{\void}
 
-\func{}{wxObjArray}{}
+\func{}{wxObjArray}{\void}
 
 Default constructor initializes an empty array object.
 
 \func{}{wxSortedArray}{\param{int (*)(T first, T second)}{compareFunction}}
 
 There is no default constructor for wxSortedArray classes - you must initialize it
-with a function to use for item comparaison. It is a function which is passed
+with a function to use for item comparison. It is a function which is passed
 two arguments of type {\it T} where {\it T} is the array element type and which
 should return a negative, zero or positive value according to whether the first
 element passed to it is less than, equal to or greater than the second one.
 
-\membersection{wxArray copy constructor and assignemnt operator}\label{wxarrayctorcopy}
+\membersection{wxArray copy constructor and assignment operator}\label{wxarrayctorcopy}
 
 \func{}{wxArray}{\param{const wxArray\& }{array}}
 
@@ -333,11 +388,11 @@ element passed to it is less than, equal to or greater than the second one.
 
 \func{}{wxObjArray}{\param{const wxObjArray\& }{array}}
 
-\func{wxArray\&}{operator=}{\param{const wxArray\& }{array}}
+\func{wxArray\&}{operator$=$}{\param{const wxArray\& }{array}}
 
-\func{wxSortedArray\&}{operator=}{\param{const wxSortedArray\& }{array}}
+\func{wxSortedArray\&}{operator$=$}{\param{const wxSortedArray\& }{array}}
 
-\func{wxObjArray\&}{operator=}{\param{const wxObjArray\& }{array}}
+\func{wxObjArray\&}{operator$=$}{\param{const wxObjArray\& }{array}}
 
 The copy constructors and assignment operators perform a shallow array copy
 (i.e. they don't copy the objects pointed to even if the source array contains
@@ -346,11 +401,11 @@ the array element are copied too) for wxObjArray.
 
 \membersection{wxArray::\destruct{wxArray}}\label{wxarraydtor}
 
-\func{}{\destruct{wxArray}}{}
+\func{}{\destruct{wxArray}}{\void}
 
-\func{}{\destruct{wxSortedArray}}{}
+\func{}{\destruct{wxSortedArray}}{\void}
 
-\func{}{\destruct{wxObjArray}}{}
+\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 
@@ -358,26 +413,33 @@ done by wxArray and wxSortedArray versions - you may use
 
 \membersection{wxArray::Add}\label{wxarrayadd}
 
-\func{\void}{Add}{\param{T }{item}}
+\func{void}{Add}{\param{T }{item}, \param{size\_t}{ copies = $1$}}
 
-\func{\void}{Add}{\param{T *}{item}}
+\func{void}{Add}{\param{T *}{item}}
 
-\func{\void}{Add}{\param{T \&}{item}}
+\func{void}{Add}{\param{T \&}{item}, \param{size\_t}{ copies = $1$}}
 
-Appends a new element to the array (where {\it T} is the type of the array
-elements.)
+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 {\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.
+because the other array types never take ownership of their elements. Also note
+that you cannot append more than one pointer as reusing it would lead to
+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 
+{\it copies} parameter and modify the elements in place later if you plan to
+append a lot of items.
 
 \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
@@ -386,7 +448,7 @@ has enough memory for the given number of items, nothing happens.
 
 \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.
@@ -403,17 +465,16 @@ it exists only for compatibility.
 \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}
@@ -440,24 +501,30 @@ Linear search is used for the wxArray and wxObjArray classes but binary search
 in the sorted array is used for wxSortedArray (this is why searchFromEnd
 parameter doesn't make sense for it).
 
+{\bf NB:} even for wxObjArray classes, the operator==() of the elements in the
+array is {\bf not} used by this function. It searches exactly the given
+element in the array and so will only succeed if this element had been
+previously added to the array, but fail even if another, identical, element is
+in the array.
+
 \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}, \param{size\_t }{copies = $1$}}
 
-\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}, \param{size\_t }{copies = $1$}}
 
-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.
+Insert the given number of {\it copies} of the {\it item} into the array before
+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.
 
 Please see \helpref{Add()}{wxarrayadd} for explanation of the differences
 between the overloaded versions of this function.
 
 \membersection{wxArray::IsEmpty}\label{wxarrayisempty}
 
-\constfunc{bool}{IsEmpty}{}
+\constfunc{bool}{IsEmpty}{\void}
 
 Returns TRUE if the array is empty, FALSE otherwise.
 
@@ -484,15 +551,16 @@ the array classes.
 
 \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 an element from the array 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:
+should delete it manually if required:
 
 \begin{verbatim}
 T *item = array[n];
@@ -503,9 +571,28 @@ array.Remove(n)
 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}, \param{size\_t }{count = $1$}}
+
+Removes {\it count} elements starting at {\it index} from 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 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.
@@ -514,7 +601,7 @@ allocated again.
 
 \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:
 
@@ -522,7 +609,7 @@ 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
