1 files changed, 209 insertions, 0 deletions
diff --git a/gnu/lib/libg++/g++-include/CHBag.ccP b/gnu/lib/libg++/g++-include/CHBag.ccP
new file mode 100644
index 000000000000..16649ac22f2f
--- /dev/null
+++ b/gnu/lib/libg++/g++-include/CHBag.ccP
@@ -0,0 +1,209 @@
+// This may look like C code, but it is really -*- C++ -*-
+/* 
+Copyright (C) 1988 Free Software Foundation
+    written by Doug Lea (dl@rocky.oswego.edu)
+
+This file is part of the GNU C++ Library.  This library is free
+software; you can redistribute it and/or modify it under the terms of
+the GNU Library General Public License as published by the Free
+Software Foundation; either version 2 of the License, or (at your
+option) any later version.  This library is distributed in the hope
+that it will be useful, but WITHOUT ANY WARRANTY; without even the
+implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+PURPOSE.  See the GNU Library General Public License for more details.
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifdef __GNUG__
+#pragma implementation
+#endif
+#include "<T>.CHBag.h"
+
+// The nodes are linked together serially via a version
+// of a trick used in some vtables: odd pointers are
+// actually links to the next table entry. 
+// Not terrible, but not wonderful either
+
+static inline int goodCHptr(<T>CHNode* t)
+{
+  return ((((unsigned)t) & 1) == 0);
+}
+
+static inline <T>CHNode* index_to_CHptr(int i)
+{
+  return (<T>CHNode*)((i << 1) + 1);
+}
+
+static inline int CHptr_to_index(<T>CHNode* t)
+{
+  return ( ((unsigned) t) >> 1);
+}
+
+<T>CHBag::<T>CHBag(unsigned int sz)
+{
+  tab = (<T>CHNode**)(new <T>CHNodePtr[size = sz]);
+  for (unsigned int i = 0; i < size; ++i) tab[i] = index_to_CHptr(i+1);
+  count = 0;
+}
+
+<T>CHBag::<T>CHBag(<T>CHBag& a)
+{
+  tab = (<T>CHNode**)(new <T>CHNodePtr[size = a.size]);
+  for (unsigned int i = 0; i < size; ++i) tab[i] = index_to_CHptr(i+1);
+  count = 0;
+  for (Pix p = a.first(); p; a.next(p)) add(a(p));
+}
+
+
+Pix <T>CHBag::seek(<T&> key, Pix i)
+{
+  <T>CHNode* p = (<T>CHNode*)i;
+  if (p == 0 || !<T>EQ(p->hd, key))
+  {
+    unsigned int h = <T>HASH(key) % size;
+    for (<T>CHNode* t = tab[h]; goodCHptr(t); t = t->tl)
+      if (<T>EQ(key, t->hd))
+        return Pix(t);
+  }
+  else
+  {
+    for (p = p->tl; goodCHptr(p); p = p->tl) 
+      if (<T>EQ(p->hd, key))
+        return Pix(p);
+  }
+  return 0;
+}
+
+int <T>CHBag::nof(<T&> key)
+{
+  int n = 0;
+  unsigned int h = <T>HASH(key) % size;
+  for (<T>CHNode* t = tab[h]; goodCHptr(t); t = t->tl) 
+    if (<T>EQ(key, t->hd)) ++n;
+  return n;
+}
+
+
+Pix <T>CHBag::add(<T&> item)
+{
+  unsigned int h = <T>HASH(item) % size;
+  <T>CHNode* t = new <T>CHNode(item);
+  t->tl = tab[h];
+  tab[h] = t;
+  ++count;
+  return Pix(t);
+}
+
+void <T>CHBag::del(<T&> key)
+{
+  unsigned int h = <T>HASH(key) % size;
+
+  <T>CHNode* t = tab[h]; 
+  <T>CHNode* trail = t;
+  while (goodCHptr(t))
+  {
+    if (<T>EQ(key, t->hd))
+    {
+      if (trail == t)
+        tab[h] = t->tl;
+      else
+        trail->tl = t->tl;
+      delete t;
+      --count;
+      return;
+    }
+    trail = t;
+    t = t->tl;
+  }
+}
+
+void <T>CHBag::remove(<T&> key)
+{
+  unsigned int h = <T>HASH(key) % size;
+
+  <T>CHNode* t = tab[h]; 
+  <T>CHNode* trail = t;
+  while (goodCHptr(t))
+  {
+    if (<T>EQ(key, t->hd))
+    {
+      --count;
+      if (trail == t)
+      {
+        tab[h] = t->tl;
+        delete t;
+        t = trail = tab[h];
+      }
+      else
+      {
+        trail->tl = t->tl;
+        delete t;
+        t = trail->tl;
+      }
+    }
+    else
+    {
+      trail = t;
+      t = t->tl;
+    }
+  }
+}
+
+
+void <T>CHBag::clear()
+{
+  for (unsigned int i = 0; i < size; ++i)
+  {
+    <T>CHNode* p = tab[i];
+    tab[i] = index_to_CHptr(i+1);
+    while (goodCHptr(p))
+    {
+      <T>CHNode* nxt = p->tl;
+      delete(p);
+      p = nxt;
+    }
+  }
+  count = 0;
+}
+
+Pix <T>CHBag::first()
+{
+  for (unsigned int i = 0; i < size; ++i) if (goodCHptr(tab[i])) return Pix(tab[i]);
+  return 0;
+}
+
+void <T>CHBag::next(Pix& p)
+{
+  if (p == 0) return;
+  <T>CHNode* t = ((<T>CHNode*)p)->tl;
+  if (goodCHptr(t))
+    p = Pix(t);
+  else
+  {
+    for (unsigned int i = CHptr_to_index(t); i < size; ++i) 
+    {
+      if (goodCHptr(tab[i]))
+      {
+        p =  Pix(tab[i]);
+        return;
+      }
+    }
+    p = 0;
+  }
+}
+
+int <T>CHBag::OK()
+{
+  int v = tab != 0;
+  int n = 0;
+  for (unsigned int i = 0; i < size; ++i)
+  {
+    for (<T>CHNode* p = tab[i]; goodCHptr(p); p = p->tl) ++n;
+    v &= CHptr_to_index(p) == i + 1;
+  }
+  v &= count == n;
+  if (!v) error("invariant failure");
+  return v;
+}