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warn the user about using getters of objects in invalid state

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52653 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2008-03-21 18:04:00 +00:00
parent 106ef548fd
commit f0a9a84c09
1 changed files with 6 additions and 1 deletions
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7
docs/doxygen/overviews/refcount.h
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@@ -53,7 +53,7 @@ provide comparison operators.
Also note that if you only need to do a @c shallow comparison between two
wxObject derived classes, you should not use the == and != operators but
rather the wxObject::IsSameAs function.
rather the wxObject::IsSameAs() function.
@section overview_refcount_destruct Object Destruction
@@ -90,6 +90,11 @@ 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.
@section overview_refcount_object Making Your Own Reference Counted Class