cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / c++ / 4.7 / ext / debug_allocator.h

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/debug_allocator.h b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/debug_allocator.h
new file mode 100644 (file)
index 0000000..12a5ea6
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/debug_allocator.h
@@ -0,0 +1,127 @@
+// Allocators -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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, 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 General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ * Copyright (c) 1996-1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file ext/debug_allocator.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _DEBUG_ALLOCATOR_H
+#define _DEBUG_ALLOCATOR_H 1
+
+#include <stdexcept>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  using std::size_t;
+
+  /**
+   *  @brief  A meta-allocator with debugging bits, as per [20.4].
+   *  @ingroup allocators
+   *
+   *  This is precisely the allocator defined in the C++ Standard. 
+   *    - all allocation calls operator new
+   *    - all deallocation calls operator delete
+   */
+  template<typename _Alloc>
+    class debug_allocator
+    {
+    public:
+      typedef typename _Alloc::size_type               size_type;
+      typedef typename _Alloc::difference_type difference_type;
+      typedef typename _Alloc::pointer         pointer;
+      typedef typename _Alloc::const_pointer    const_pointer;
+      typedef typename _Alloc::reference               reference;
+      typedef typename _Alloc::const_reference  const_reference;
+      typedef typename _Alloc::value_type       value_type;
+
+    private:
+      // _M_extra is the number of objects that correspond to the
+      // extra space where debug information is stored.
+      size_type                _M_extra;
+      
+      _Alloc                   _M_allocator;
+
+    public:
+      debug_allocator()
+      {
+       const size_t __obj_size = sizeof(value_type);
+       _M_extra = (sizeof(size_type) + __obj_size - 1) / __obj_size; 
+      }
+      
+      pointer
+      allocate(size_type __n)
+      {
+        pointer __res = _M_allocator.allocate(__n + _M_extra);      
+       size_type* __ps = reinterpret_cast<size_type*>(__res);
+       *__ps = __n;
+        return __res + _M_extra;
+      }
+
+      pointer
+      allocate(size_type __n, const void* __hint)
+      {
+        pointer __res = _M_allocator.allocate(__n + _M_extra, __hint);
+       size_type* __ps = reinterpret_cast<size_type*>(__res);
+       *__ps = __n;
+        return __res + _M_extra;
+      }
+
+      void
+      deallocate(pointer __p, size_type __n)
+      {
+       if (__p)
+         {
+           pointer __real_p = __p - _M_extra;
+           if (*reinterpret_cast<size_type*>(__real_p) != __n)
+             {
+               throw std::runtime_error("debug_allocator::deallocate"
+                                        " wrong size");
+             }
+           _M_allocator.deallocate(__real_p, __n + _M_extra);
+         }
+       else
+         throw std::runtime_error("debug_allocator::deallocate null pointer");
+      }
+    };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif