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stl_tree.h: _Rb_tree_rebalance(): Add local variable for grandparent and use const

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2003-07-05  Gawain Bolton  <gp.bolton@computer.org>

	* include/bits/stl_tree.h: _Rb_tree_rebalance():  Add local
          variable for grandparent and use const

From-SVN: r68977
This commit is contained in:
Gawain Bolton 2003-07-05 15:47:09 +00:00 committed by Benjamin Kosnik
parent 39e3f58cbc
commit f92c5313e1
2 changed files with 26 additions and 19 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,3 +1,8 @@
2003-07-05 Gawain Bolton <gp.bolton@computer.org>
* include/bits/stl_tree.h: _Rb_tree_rebalance(): Add local
variable for grandparent and use const
2003-07-05 David Billinghurst <David.Billinghurst@riotinto.com>
* testsuite/27_io/basic_filebuf/close/char/4879.cc: xfail on cygwin

40
libstdc++-v3/include/bits/stl_tree.h
View File

@ -265,9 +265,9 @@ namespace std
{ return __x._M_node != __y._M_node; }
inline void
_Rb_tree_rotate_left(_Rb_tree_node_base* __x, _Rb_tree_node_base*& __root)
_Rb_tree_rotate_left(_Rb_tree_node_base* const __x, _Rb_tree_node_base*& __root)
{
_Rb_tree_node_base* __y = __x->_M_right;
_Rb_tree_node_base* const __y = __x->_M_right;
__x->_M_right = __y->_M_left;
if (__y->_M_left !=0)
__y->_M_left->_M_parent = __x;
@ -284,9 +284,9 @@ namespace std
}
inline void
_Rb_tree_rotate_right(_Rb_tree_node_base* __x, _Rb_tree_node_base*& __root)
_Rb_tree_rotate_right(_Rb_tree_node_base* const __x, _Rb_tree_node_base*& __root)
{
_Rb_tree_node_base* __y = __x->_M_left;
_Rb_tree_node_base* const __y = __x->_M_left;
__x->_M_left = __y->_M_right;
if (__y->_M_right != 0)
__y->_M_right->_M_parent = __x;
@ -309,15 +309,17 @@ namespace std
while (__x != __root
&& __x->_M_parent->_M_color == _S_red)
{
if (__x->_M_parent == __x->_M_parent->_M_parent->_M_left)
_Rb_tree_node_base* const __xpp = __x->_M_parent->_M_parent;
if (__x->_M_parent == __xpp->_M_left)
{
_Rb_tree_node_base* __y = __x->_M_parent->_M_parent->_M_right;
_Rb_tree_node_base* const __y = __xpp->_M_right;
if (__y && __y->_M_color == _S_red)
{
__x->_M_parent->_M_color = _S_black;
__y->_M_color = _S_black;
__x->_M_parent->_M_parent->_M_color = _S_red;
__x = __x->_M_parent->_M_parent;
__xpp->_M_color = _S_red;
__x = __xpp;
}
else
{
@ -327,19 +329,19 @@ namespace std
_Rb_tree_rotate_left(__x, __root);
}
__x->_M_parent->_M_color = _S_black;
__x->_M_parent->_M_parent->_M_color = _S_red;
_Rb_tree_rotate_right(__x->_M_parent->_M_parent, __root);
__xpp->_M_color = _S_red;
_Rb_tree_rotate_right(__xpp, __root);
}
}
else
{
_Rb_tree_node_base* __y = __x->_M_parent->_M_parent->_M_left;
_Rb_tree_node_base* const __y = __xpp->_M_left;
if (__y && __y->_M_color == _S_red)
{
__x->_M_parent->_M_color = _S_black;
__y->_M_color = _S_black;
__x->_M_parent->_M_parent->_M_color = _S_red;
__x = __x->_M_parent->_M_parent;
__xpp->_M_color = _S_red;
__x = __xpp;
}
else
{
@ -349,8 +351,8 @@ namespace std
_Rb_tree_rotate_right(__x, __root);
}
__x->_M_parent->_M_color = _S_black;
__x->_M_parent->_M_parent->_M_color = _S_red;
_Rb_tree_rotate_left(__x->_M_parent->_M_parent, __root);
__xpp->_M_color = _S_red;
_Rb_tree_rotate_left(__xpp, __root);
}
}
}
@ -358,10 +360,10 @@ namespace std
}
inline _Rb_tree_node_base*
_Rb_tree_rebalance_for_erase(_Rb_tree_node_base* __z,
_Rb_tree_node_base*& __root,
_Rb_tree_node_base*& __leftmost,
_Rb_tree_node_base*& __rightmost)
_Rb_tree_rebalance_for_erase(_Rb_tree_node_base* const __z,
_Rb_tree_node_base*& __root,
_Rb_tree_node_base*& __leftmost,
_Rb_tree_node_base*& __rightmost)
{
_Rb_tree_node_base* __y = __z;
_Rb_tree_node_base* __x = 0;