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more about virtual functions access specifier changing

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44178 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Vadim Zeitlin
2007-01-09 14:01:08 +00:00
parent a8990bd443
commit 63dd461bc8
1 changed files with 8 additions and 2 deletions
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10
docs/tech/tn0020.txt
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@@ -46,8 +46,14 @@ The changes that are NOT binary compatible:
even a default one)
- Changing the order of the virtual functions in a class
["switching" them, etc.]
- Changing access privileges to a function (protected to private etc.)
[unlike KDE we need to support windows so this is not allowed]
- Changing access privileges of a function: some compilers (among which MSVC)
use the function access specifier in its mangled name. Moreover, while
changing a private function to public should be compatible (as the old
symbol can't be referenced from outside the library anyhow), changing a
virtual private function to public is NOT compatible because the old symbol
is referenced by the virtual tables in the executable code and so an old
program compiled with MSVC wouldn't start up with a new DLL even if it
doesn't use the affected symbol at all!
- Adding a member variable
- Changing the order of non-static member variables