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# csutil/blockallocator.h

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    00001 /*
    00002   Crystal Space Generic Object Block Allocator
    00003   Copyright (C) 2005 by Eric Sunshine <sunshine@sunshineco.com>
    00004             (C) 2006 by Frank Richter
    00005
    00006   This library is free software; you can redistribute it and/or
    00007   modify it under the terms of the GNU Library General Public
    00008   License as published by the Free Software Foundation; either
    00009   version 2 of the License, or (at your option) any later version.
    00010
    00011   This library is distributed in the hope that it will be useful,
    00012   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014   Library General Public License for more details.
    00015
    00016   You should have received a copy of the GNU Library General Public
    00017   License along with this library; if not, write to the Free
    00018   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00019 */
    00020 #ifndef __CSUTIL_BLOCKALLOCATOR_H__
    00021 #define __CSUTIL_BLOCKALLOCATOR_H__
    00022
    00027 #include "csutil/fixedsizeallocator.h"
    00028
    00029 #include "csutil/custom_new_disable.h"
    00030
    00037 template<typename T>
    00038 class csBlockAllocatorDisposeDelete
    00039 {
    00040 public:
    00044   template<typename BA>
    00045   csBlockAllocatorDisposeDelete (const BA&, bool legit)
    00046   { (void)legit; }
    00048   void Dispose (void* p)
    00049   {
    00050     ((T*)p)->~T();
    00051   }
    00052 };
    00053
    00058 template<typename T>
    00059 class csBlockAllocatorDisposeLeaky
    00060 {
    00061   bool doWarn;
    00062 #ifdef CS_DEBUG
    00063   const char* parentClass;
    00064   const void* parent;
    00065   size_t count;
    00066 #endif
    00067 public:
    00068 #ifdef CS_DEBUG
    00069
    00076   template<typename BA>
    00077   csBlockAllocatorDisposeLeaky (const BA& ba, bool legit) :
    00078     doWarn (!legit), parentClass (typeid(BA).name()), parent (&ba),
    00079     count (0)
    00080   {
    00081   }
    00082 #else
    00083   template<typename BA>
    00084   csBlockAllocatorDisposeLeaky (const BA&, bool legit) : doWarn (!legit)
    00085   { }
    00086 #endif
    00087   ~csBlockAllocatorDisposeLeaky()
    00088   {
    00089 #ifdef CS_DEBUG
    00090     if ((count > 0) && doWarn)
    00091     {
    00092       csPrintfErr("%s %p leaked %zu objects.\n", parentClass, (void*)this,
    00093         count);
    00094     }
    00095 #endif
    00096   }
    00098   void Dispose (void* p)
    00099   {
    00100     if (!doWarn) ((T*)p)->~T();
    00101 #ifdef CS_DEBUG
    00102     count++;
    00103 #endif
    00104   }
    00105 };
    00106
    00127 template <class T,
    00128   class Allocator = CS::Memory::AllocatorMalloc,
    00129   class ObjectDispose = csBlockAllocatorDisposeDelete<T> >
    00130 class csBlockAllocator : public csFixedSizeAllocator<sizeof (T), Allocator>
    00131 {
    00132 public:
    00133   typedef csBlockAllocator<T, Allocator> ThisType;
    00134   typedef T ValueType;
    00135   typedef Allocator AllocatorType;
    00136
    00137 protected:
    00138   typedef csFixedSizeAllocator<sizeof (T), Allocator> superclass;
    00139 private:
    00140   void* Alloc (size_t /*n*/) { return 0; }                       // Illegal
    00141   void* Alloc (void* /*p*/, size_t /*newSize*/) { return 0; }   // Illegal
    00142   void SetMemTrackerInfo (const char* /*info*/) { }             // Illegal
    00143 public:
    00163   csBlockAllocator(size_t nelem = 32) : superclass (nelem)
    00164   {
    00165   }
    00166
    00170   ~csBlockAllocator()
    00171   {
    00172     ObjectDispose dispose (*this, false);
    00173     DisposeAll (dispose);
    00174   }
    00175
    00181   void Empty()
    00182   {
    00183     ObjectDispose dispose (*this, true);
    00184     DisposeAll (dispose);
    00185   }
    00186
    00191   T* Alloc ()
    00192   {
    00193     return new (superclass::Alloc()) T;
    00194   }
    00195
    00200   void Free (T* p)
    00201   {
    00202     ObjectDispose dispose (*this, true);
    00203     superclass::Free (dispose, p);
    00204   }
    00210   bool TryFree (T* p)
    00211   {
    00212     ObjectDispose dispose (*this, true);
    00213     return superclass::TryFree (dispose, p);
    00214   }
    00215 };
    00216
    00219 #include "csutil/custom_new_enable.h"
    00220
    00221 #endif // __CSUTIL_BLOCKALLOCATOR_H__