[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.44 by root, Fri May 11 08:00:00 2007 UTC vs.
Revision 1.52 by root, Wed Jul 11 12:29:06 2007 UTC

+/*
+ * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
+ *
+ * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
+ *
+ * Crossfire TRT is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The authors can be reached via e-mail to <crossfire@schmorp.de>
+ */
 #ifndef UTIL_H__
 #define UTIL_H__
 //#define PREFER_MALLOC
 #if __GNUC__ >= 3
-# define is_constant(c) __builtin_constant_p (c)
+# define is_constant(c)             __builtin_constant_p (c)
+# define expect(expr,value)         __builtin_expect ((expr),(value))
+# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
 #else
-# define is_constant(c) 0
+# define is_constant(c)             0
+# define expect(expr,value)         (expr)
+# define prefetch(addr,rw,locality)
 #endif
+#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
+# define decltype(x) typeof(x)
+#endif
+// put into ifs if you are very sure that the expression
+// is mostly true or mosty false. note that these return
+// booleans, not the expression.
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr)  expect ((expr) != 0, 1)
 #include <cstddef>
 #include <cmath>
 #include <new>
 #include <vector>
 #include <glib.h>
 #include <shstr.h>
 #include <traits.h>
-// use a gcc extension for auto declarations until ISO C++ sanctifies them
+// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
-#define auto(var,expr) typeof(expr) var = (expr)
+#define auto(var,expr) decltype(expr) var = (expr)
 // very ugly macro that basicaly declares and initialises a variable
 // that is in scope for the next statement only
 // works only for stuff that can be assigned 0 and converts to false
 // (note: works great for pointers)
 // most ugly macro I ever wrote
-#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
+#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
 // in range including end
 #define IN_RANGE_INC(val,beg,end) \
   ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
   {
     return !strcmp (a, b);
   }
 };
+// Mostly the same as std::vector, but insert/erase can reorder
+// the elements, making append(=insert)/remove O(1) instead of O(n).
+//
+// NOTE: only some forms of erase are available
 template<class T>
 struct unordered_vector : std::vector<T, slice_allocator<T> >
 {
   typedef typename unordered_vector::iterator iterator;
   {
     erase ((unsigned int )(i - this->begin ()));
   }
 };
-template<class T, int T::* index>
+// This container blends advantages of linked lists
+// (efficiency) with vectors (random access) by
+// by using an unordered vector and storing the vector
+// index inside the object.
+//
+// + memory-efficient on most 64 bit archs
+// + O(1) insert/remove
+// + free unique (but varying) id for inserted objects
+// + cache-friendly iteration
+// - only works for pointers to structs
+//
+// NOTE: only some forms of erase/insert are available
+typedef int object_vector_index;
+template<class T, object_vector_index T::*indexmember>
 struct object_vector : std::vector<T *, slice_allocator<T *> >
 {
+  typedef typename object_vector::iterator iterator;
+  bool contains (const T *obj) const
+  {
+    return obj->*indexmember;
+  }
+  iterator find (const T *obj)
+  {
+    return obj->*indexmember
+      ? this->begin () + obj->*indexmember - 1
+      : this->end ();
+  }
   void insert (T *obj)
   {
-    assert (!(obj->*index));
     push_back (obj);
-    obj->*index = this->size ();
+    obj->*indexmember = this->size ();
   }
   void insert (T &obj)
   {
     insert (&obj);
   }
   void erase (T *obj)
   {
-    assert (obj->*index);
-    unsigned int pos = obj->*index;
+    unsigned int pos = obj->*indexmember;
-    obj->*index = 0;
+    obj->*indexmember = 0;
     if (pos < this->size ())
       {
         (*this)[pos - 1] = (*this)[this->size () - 1];
-        (*this)[pos - 1]->*index = pos;
+        (*this)[pos - 1]->*indexmember = pos;
       }
     this->pop_back ();
   }
   void erase (T &obj)
   {
-    errase (&obj);
+    erase (&obj);
   }
 };
 // basically does what strncpy should do, but appends "..." to strings exceeding length
 void assign (char *dst, const char *src, int maxlen);

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Comparing deliantra/server/include/util.h (file contents): Revision 1.44 by root, Fri May 11 08:00:00 2007 UTC vs. Revision 1.52 by root, Wed Jul 11 12:29:06 2007 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.44 by root, Fri May 11 08:00:00 2007 UTC vs.
Revision 1.52 by root, Wed Jul 11 12:29:06 2007 UTC