Annotation of parser3/src/include/pa_array.h, revision 1.27.2.1
1.24 paf 1: /** @file
1.26 paf 2: Parser: array class decl.
3:
1.21 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.26 paf 5:
1.22 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.21 paf 7:
1.27.2.1! paf 8: $Id: pa_array.h,v 1.27 2001/03/20 06:45:18 paf Exp $
1.1 paf 9: */
10:
1.24 paf 11: #ifndef PA_ARRAY_H
12: #define PA_ARRAY_H
13:
14: #include <stddef.h>
15:
16: #include "pa_pool.h"
17: #include "pa_types.h"
18: #include "pa_string.h"
19:
1.25 paf 20: /**
1.24 paf 21: Pooled Array.
22:
1.27 paf 23: Internal structure:
24: @verbatim
25: Array Chunk0
26: ====== ========
27: head--------------->[ptr]
28: append_here-------->[ptr]
29: link_row ........
30: . .
31: . [ptr]
32: ...........>[link to the next chunk]
1.24 paf 33: @endverbatim
1.1 paf 34: */
35:
1.13 paf 36: class Array : public Pooled {
1.1 paf 37: public:
1.7 paf 38:
1.24 paf 39: typedef void Item; ///< Array item type
1.10 paf 40:
1.1 paf 41: enum {
1.24 paf 42: CR_INITIAL_ROWS_DEFAULT=10, ///< default preallocated row count
43: CR_GROW_PERCENT=60 ///< each time the Array chunk_is_full() array expanded()
1.1 paf 44: };
45:
1.6 paf 46: public:
47:
1.11 paf 48: Array(Pool& apool, int initial_rows=CR_INITIAL_ROWS_DEFAULT);
1.7 paf 49:
1.24 paf 50: /// size Array. how many items are in it
1.18 paf 51: int size() const {
52: // for get and quick_get
53: cache_chunk_base=0;
54: cache_chunk=head;
55: return fused_rows;
56: }
1.24 paf 57: /// append Item to array
1.15 paf 58: Array& operator += (Item *src);
1.24 paf 59:
60: /// dirty hack to allow constant items storage. I long for Array<const Item*>
1.20 paf 61: Array& operator += (const Item *src) { return *this+=const_cast<Item*>(src); }
1.24 paf 62:
63: /// append other Array portion to this one. starting from offset
1.19 paf 64: Array& append_array(const Array& src, int offset=0);
1.24 paf 65:
1.25 paf 66: /**
67: quickly gets some item considering...
1.24 paf 68:
69: these true:
70: - index increments from 0 to size()-1
71: - index>=0 && index<size()
72: - index>=cache_chunk_base
73: */
1.16 paf 74: Item *quick_get(int index) const {
1.14 paf 75: // next chunk will be with "index" row
76: if(!(index<cache_chunk_base+cache_chunk->count)) {
77: int count=cache_chunk->count;
78: cache_chunk_base+=count;
79: cache_chunk=cache_chunk->rows[count].link;
80: }
81:
82: return cache_chunk->rows[index-cache_chunk_base].item;
83: }
84:
1.15 paf 85: Item *get(int index) const;
1.17 paf 86: void put(int index, Item *item);
1.24 paf 87: /// convinient way to get strings from Array. I long for Array<const String *>
1.12 paf 88: const String *get_string(int index) const {
1.27.2.1! paf 89: return const_cast<const String *>(static_cast<String *>(get(index)));
1.12 paf 90: }
1.1 paf 91:
1.7 paf 92: private:
93:
1.1 paf 94: struct Chunk {
95: // the number of rows in chunk
96: int count;
97: union Row {
1.15 paf 98: Item *item;
1.1 paf 99: Chunk *link; // link to the next chunk in chain
100: } rows[1];
101: // next rows are here
102: }
103: *head; // the head chunk of the chunk chain
104:
1.5 paf 105: // last allocated chunk
106: // helps appending Arrays
107: Chunk *tail;
108:
1.1 paf 109: // next append would write to this record
110: Chunk::Row *append_here;
111:
112: // the address of place where lies address
113: // of the link to the next chunk to allocate
114: Chunk::Row *link_row;
115:
116: private:
1.7 paf 117:
1.1 paf 118: // array size
119: int fused_rows;
120:
1.12 paf 121: mutable int cache_chunk_base;
122: mutable Chunk *cache_chunk;
1.2 paf 123:
1.1 paf 124: private:
125:
126: bool chunk_is_full() {
127: return append_here == link_row;
128: }
1.5 paf 129: void expand(int chunk_rows);
1.2 paf 130:
1.1 paf 131: private: //disabled
132:
1.11 paf 133: //Array(Array&) { }
1.12 paf 134: Array& operator = (const Array&) { return *this; }
1.1 paf 135: };
136:
137: #endif
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