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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_oct_alloc_h) |
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25 #define octave_oct_alloc_h 1 |
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26 |
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27 class |
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28 octave_allocator |
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29 { |
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30 public: |
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31 |
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32 octave_allocator (size_t item_sz, int grow_sz = 256) |
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33 : head (0), grow_size (grow_sz), |
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34 item_size (item_sz > sizeof (link *) ? item_sz : sizeof (link *)) |
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35 { } |
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36 |
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37 // Get an object from the free list, possibly increasing the size of |
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38 // the free list. |
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39 void *alloc (size_t size); |
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40 |
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41 // Put objects back on the free list. |
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42 void free (void *p, size_t size); |
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43 |
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44 private: |
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45 |
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46 // Structure for internal free list management. |
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47 struct link { link *next; }; |
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48 |
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49 // Front of the free list. |
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50 link *head; |
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51 |
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52 // How many objects to get each time we call the global operator new. |
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53 int grow_size; |
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54 |
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55 // The size of each item on the list (or, if that is smaller than |
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56 // the size of list*, the size of list*. |
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57 size_t item_size; |
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58 |
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59 // How to grow the free list. |
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60 bool grow (void); |
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61 }; |
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62 |
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63 #if defined (HAVE_PLACEMENT_DELETE) |
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64 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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65 void operator delete (void *p, void *) \ |
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66 { ::operator delete (p, static_cast<void*> (0)); } |
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67 #else |
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68 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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69 void operator delete (void *p, void *) \ |
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70 { ::operator delete (p); } |
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71 #endif |
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72 |
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73 #define DECLARE_OCTAVE_ALLOCATOR \ |
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74 public: \ |
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75 void *operator new (size_t size, void *p) \ |
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76 { return ::operator new (size, p); } \ |
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77 DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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78 void *operator new (size_t size) { return allocator.alloc (size); } \ |
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79 void operator delete (void *p, size_t size) { allocator.free (p, size); } \ |
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80 private: \ |
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81 static octave_allocator allocator; |
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82 |
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83 #define DEFINE_OCTAVE_ALLOCATOR(t) \ |
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84 octave_allocator t::allocator (sizeof (t)) |
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85 |
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86 #define DEFINE_OCTAVE_ALLOCATOR2(t, s) \ |
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87 octave_allocator t::allocator (sizeof (t), s) |
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88 |
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89 #endif |
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90 |
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91 /* |
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92 ;;; Local Variables: *** |
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93 ;;; mode: C++ *** |
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94 ;;; End: *** |
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95 */ |
