Updated [Patch]: PR libstdc++/11504 + constness and casting clean up

[Gawain Bolton]

Ok, here's to hoping there is some truth in the expression "third time 
lucky".

This patch is an update of the one posted here:
   http://gcc.gnu.org/ml/libstdc++/2003-07/msg00477.html

The only change made was to ensure that the new typedefs follow the 
required naming scheme as pointed out by Phil Edwards here:
   http://gcc.gnu.org/ml/libstdc++/2003-07/msg00481.html

Here's the suggested change log entry, again adapted following Phil's 
comments given here:
   http://gcc.gnu.org/ml/libstdc++/2003-07/msg00480.html

2003-07-29 Gawain Bolton <gp.bolton@computer.org>

        * include/bits/stl_tree.h: Fix PR libstdc++/11504.  Replace
        C-style casts with C++-style casts.  Changes to avoid
        casting away constness.  Eliminate _Rb_tree_base_iterator
        class.  Change _Rb_tree_iterator to use initialization lists.
        Move out implementation of __black_count() to...
        * src/stl_tree.cc: here and rename _Rb_tree_black_count().
        Rename_Rb_tree_base_iterator::_M_increment() to
        _Rb_tree_increment and _Rb_tree_base_iterator::_M_decrement() to
        _Rb_tree_decrement.
        * config/linker-map.gnu: Add and change symbols here.

Cheers,


Gawain

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Gawain Bolton
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