X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f0a9a84c09e9c8a85617536d62400c469b6cc62c..4e15d1caa03346c126015019c1fdf093033ef40b:/docs/doxygen/overviews/refcount.h
diff --git a/docs/doxygen/overviews/refcount.h b/docs/doxygen/overviews/refcount.h
index 48a2bf1bb7..bcddbd5e7d 100644
--- a/docs/doxygen/overviews/refcount.h
+++ b/docs/doxygen/overviews/refcount.h
@@ -3,24 +3,14 @@
// Purpose: topic overview
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
@page overview_refcount Reference Counting
-@li @ref overview_refcount_ignore
-@li @ref overview_refcount_equality
-@li @ref overview_refcount_destruct
-@li @ref overview_refcount_list
-@li @ref overview_refcount_object
-
-
-
-
-
-@section overview_refcount_ignore Why You Shouldn't Care About It
+@tableofcontents
Many wxWidgets objects use a technique known as reference counting,
also known as copy on write (COW). This means that when an object is
@@ -41,12 +31,13 @@ operation on it is the same.
@section overview_refcount_equality Object Comparison
-The == and != operators of the reference counted classes always do a @c deep
-comparison. This means that the equality operator will return @true if two
-objects are identical and not only if they share the same data.
+The == and != operators of @ref overview_refcount_list "the reference counted classes"
+always do a deep comparison. This means that the equality operator
+will return @true if two objects are identical and not only if they share the
+same data.
Note that wxWidgets follows the STL philosophy: when a comparison
-operator can not be implemented efficiently (like for e.g. wxImage's ==
+operator cannot be implemented efficiently (like for e.g. wxImage's ==
operator which would need to compare the entire image's data, pixel-by-pixel),
it's not implemented at all. That's why not all reference counted classes
provide comparison operators.
@@ -77,6 +68,12 @@ operators and copy constructors since they are reference-counted:
@li wxBrush
@li wxCursor
@li wxFont
+@li wxGraphicsBrush
+@li wxGraphicsContext
+@li wxGraphicsFont
+@li wxGraphicsMatrix
+@li wxGraphicsPath
+@li wxGraphicsPen
@li wxIcon
@li wxImage
@li wxMetafile
@@ -90,19 +87,20 @@ operators and copy constructors since they are reference-counted:
Note that the list above reports the objects which are reference counted in all
ports of wxWidgets; some ports may use this technique also for other classes.
-All the objects implement a function IsOk() to test if they are referencing valid
-data; when the objects are in uninitialized state, you can only use the IsOk() getter;
-trying to call any other getter, e.g. wxBrush::GetStyle() on the ::wxNullBrush object,
-will result in an assert failure in debug builds.
+All the objects implement a function @b IsOk() to test if they are referencing
+valid data; when the objects are in uninitialized state, you can only use the
+@b IsOk() getter; trying to call any other getter, e.g. wxBrush::GetStyle() on
+the ::wxNullBrush object, will result in an assert failure in debug builds.
@section overview_refcount_object Making Your Own Reference Counted Class
-Reference counting can be implemented easily using wxObject and wxObjectRefData
-classes. Alternatively, you can also use the wxObjectDataPtr template.
+Reference counting can be implemented easily using wxObject or using the
+intermediate wxRefCounter class directly. Alternatively, you can also use the
+wxObjectDataPtr template.
-First, derive a new class from wxObjectRefData and put there the
-memory-consuming data.
+First, derive a new class from wxRefCounter (or wxObjectRefData when using a
+wxObject derived class) and put the memory-consuming data in it.
Then derive a new class from wxObject and implement there the public interface
which will be seen by the user of your class. You'll probably want to add a
@@ -120,9 +118,8 @@ In fact, any time you need to read the data from your wxObject-derived class,
you will need to call this function.
@note Any time you need to actually modify the data placed inside your wxObject
-derived class, you must first call the wxObject::UnShare function to ensure
+derived class, you must first call the wxObject::UnShare() function to ensure
that the modifications won't affect other instances which are eventually
sharing your object's data.
*/
-