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# csutil/parray.h

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    00001 /*
    00002   Crystal Space Pointer Array
    00003   Copyright (C) 2003 by Jorrit Tyberghein
    00004
    00005   This library is free software; you can redistribute it and/or
    00006   modify it under the terms of the GNU Library General Public
    00007   License as published by the Free Software Foundation; either
    00008   version 2 of the License, or (at your option) any later version.
    00009
    00010   This library is distributed in the hope that it will be useful,
    00011   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013   Library General Public License for more details.
    00014
    00015   You should have received a copy of the GNU Library General Public
    00016   License along with this library; if not, write to the Free
    00017   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00018 */
    00019
    00020 #ifndef __CS_PTRARR_H__
    00021 #define __CS_PTRARR_H__
    00022
    00027 //-----------------------------------------------------------------------------
    00028 // Note *1*: The explicit "this->" is needed by modern compilers (such as gcc
    00029 // 3.4.x) which distinguish between dependent and non-dependent names in
    00030 // templates.  See: http://gcc.gnu.org/onlinedocs/gcc/Name-lookup.html
    00031 //-----------------------------------------------------------------------------
    00032
    00033 #include "csextern.h"
    00034 #include "csutil/array.h"
    00035
    00036 template <class T>
    00037 class csPDelArrayElementHandler
    00038 {
    00039 public:
    00040   static void Construct (T* address, T const& src)
    00041   {
    00042     *address = src;
    00043   }
    00044
    00045   static void Destroy (T* address)
    00046   {
    00047     delete *address;
    00048   }
    00049
    00050   static void InitRegion (T* address, size_t count)
    00051   {
    00052     memset (address, 0, count*sizeof (T));
    00053   }
    00054 };
    00055
    00063 template <class T>
    00064 class csPDelArray : public csArray<T*, csPDelArrayElementHandler<T*> >
    00065 {
    00066   typedef csArray<T*, csPDelArrayElementHandler<T*> > superclass;
    00067
    00068 private:
    00069   csPDelArray (const csPDelArray&);            // Illegal; unimplemented.
    00070   csPDelArray& operator= (const csPDelArray&); // Illegal; unimplemented.
    00071
    00072 public:
    00077   csPDelArray (int ilimit = 0, int ithreshold = 0) :
    00078     csArray<T*, csPDelArrayElementHandler<T*> > (ilimit, ithreshold) {}
    00079
    00085   T* GetAndClear (size_t n)
    00086   {
    00087     T* ret = this->Get (n); // see *1*
    00088     this->InitRegion (n, 1);
    00089     return ret;
    00090   }
    00091
    00097   T* Extract (size_t n)
    00098   {
    00099     T* ret = GetAndClear (n);
    00100     this->DeleteIndex (n); // see *1*
    00101     return ret;
    00102   }
    00103
    00105   T* Pop ()
    00106   {
    00107     CS_ASSERT (this->Length () > 0);
    00108     T* ret = GetAndClear (this->Length () - 1); // see *1*
    00109     Truncate (this->Length () - 1);
    00110     return ret;
    00111   }
    00112
    00117   void SetLength (size_t n, T const &what)
    00118   {
    00119     if (n <= this->Length ()) // see *1*
    00120     {
    00121       this->Truncate (n);
    00122     }
    00123     else
    00124     {
    00125       size_t old_len = this->Length (); // see *1*
    00126       superclass::SetLength (n);
    00127       for (size_t i = old_len ; i < n ; i++) this->Get(i) = new T (what);
    00128     }
    00129   }
    00130
    00132   void SetLength (size_t n, T* const &w)
    00133   {
    00134     superclass::SetLength(n, w);
    00135   }
    00136
    00138   void SetLength (size_t n)
    00139   {
    00140     superclass::SetLength(n);
    00141   }
    00142 };
    00143
    00144 #endif // __CS_PTRARR_H__
    00145