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Cleanup _Rb_tree_impl in versioned namespace


Jonathan proposed to leverage on versioned namespace to do some abi breaking change so here is one simple on _Rb_tree_impl.

I wonder if versioned namespace should be bump for this change. Do we really have any kind of abi compatibility for versioned namespace ? I guess not but so why a versioned namespace ?

    Tested under x86_64 linux, ok to commit ?

Note that I also plan some white spaces cleanup in the patch that I have hidden by using git diff -w.


diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 593f1ad..6cbdf9f 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
+      template<typename _Key_compare>
       // Unused _Is_pod_comparator is kept as it is part of mangled name.
       template<typename _Key_compare,
 	       bool /* _Is_pod_comparator */ = __is_pod(_Key_compare)>
 	struct _Rb_tree_impl
 	: public _Node_allocator
 	, public _Rb_tree_key_compare<_Key_compare>

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