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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_oct_alloc_h) |
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24 #define octave_oct_alloc_h 1 |
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25 |
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26 class |
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27 octave_allocator |
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28 { |
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29 public: |
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30 |
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31 octave_allocator (size_t item_sz, int grow_sz = 256) |
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32 : head (0), grow_size (grow_sz), |
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33 item_size (item_sz > sizeof (link *) ? item_sz : sizeof (link *)) |
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34 { } |
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35 |
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36 // Get an object from the free list, possibly increasing the size of |
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37 // the free list. |
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38 void *alloc (size_t size); |
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39 |
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40 // Put objects back on the free list. |
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41 void free (void *p, size_t size); |
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42 |
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43 private: |
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44 |
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45 // Structure for internal free list management. |
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46 struct link { link *next; }; |
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47 |
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48 // Front of the free list. |
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49 link *head; |
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50 |
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51 // How many objects to get each time we call the global operator new. |
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52 int grow_size; |
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53 |
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54 // The size of each item on the list (or, if that is smaller than |
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55 // the size of list*, the size of list*. |
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56 size_t item_size; |
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57 |
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58 // How to grow the free list. |
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59 bool grow (void); |
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60 }; |
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61 |
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62 #if defined (HAVE_PLACEMENT_DELETE) |
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63 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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64 void operator delete (void *p, void *) \ |
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65 { ::operator delete (p, static_cast<void*> (0)); } |
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66 #else |
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67 #define DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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68 void operator delete (void *p, void *) \ |
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69 { ::operator delete (p); } |
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70 #endif |
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71 |
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72 #define DECLARE_OCTAVE_ALLOCATOR \ |
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73 public: \ |
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74 void *operator new (size_t size, void *p) \ |
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75 { return ::operator new (size, p); } \ |
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76 DECLARE_OCTAVE_ALLOCATOR_PLACEMENT_DELETE \ |
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77 void *operator new (size_t size) { return allocator.alloc (size); } \ |
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78 void operator delete (void *p, size_t size) { allocator.free (p, size); } \ |
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79 private: \ |
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80 static octave_allocator allocator; |
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81 |
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82 #define DEFINE_OCTAVE_ALLOCATOR(t) \ |
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83 octave_allocator t::allocator (sizeof (t)) |
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84 |
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85 #define DEFINE_OCTAVE_ALLOCATOR2(t, s) \ |
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86 octave_allocator t::allocator (sizeof (t), s) |
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87 |
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88 #endif |
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89 |
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90 /* |
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91 ;;; Local Variables: *** |
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92 ;;; mode: C++ *** |
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93 ;;; End: *** |
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94 */ |
