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vcl_alloc.h

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00001 /*========================================================================= 00002 00003 Program: Insight Segmentation & Registration Toolkit 00004 Module: $RCSfile: vcl_alloc.h,v $ 00005 Language: C++ 00006 Date: $Date: 2003/09/10 14:29:30 $ 00007 Version: $Revision: 1.5 $ 00008 00009 Copyright (c) Insight Software Consortium. All rights reserved. 00010 See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. 00011 00012 This software is distributed WITHOUT ANY WARRANTY; without even 00013 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00014 PURPOSE. See the above copyright notices for more information. 00015 00016 =========================================================================*/ 00017 #ifndef vcl_alloc_h 00018 #define vcl_alloc_h 00019 00020 // That is an adaptor for working with any alloc provided below 00021 template<class T, class Alloc> 00022 class vcl_simple_alloc { 00023 typedef Alloc alloc_type; 00024 public: 00025 typedef typename Alloc::value_type alloc_value_type; // awf 00026 typedef T value_type; 00027 00028 #if !__STL_EAGER_TYPECHECK 00029 enum { 00030 chunk = sizeof(value_type)/sizeof(alloc_value_type)+(sizeof(value_type)%sizeof(alloc_value_type)>0) 00031 }; 00032 #else 00033 // note: any out-of-line template definitions will not see this. 00034 #define chunk (sizeof(value_type)/sizeof(alloc_value_type)+(sizeof(value_type)%sizeof(alloc_value_type)>0)) 00035 #endif 00036 00037 static value_type *allocate(size_t n) 00038 { return 0 == n? 0 : (value_type*) alloc_type().allocate(n * chunk, 0); } 00039 static value_type *allocate(void) 00040 { return (value_type*) alloc_type().allocate(chunk, 0); } 00041 static void deallocate(value_type *p, size_t n) 00042 { if (0 != n) alloc_type().deallocate(p, n * chunk); } 00043 static void deallocate(value_type *p) 00044 { alloc_type().deallocate((char*)p, chunk); } 00045 00046 #undef chunk 00047 }; 00048 #endif

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