Annotation of parser3/src/include/pa_array.h, revision 1.14
1.1 paf 1: /*
1.14 ! paf 2: $Id: pa_array.h,v 1.13 2001/02/11 11:27:24 paf Exp $
1.1 paf 3: */
4:
5: /*
6:
7: Array Chunk0
8: ====== ========
9: head--------------->[ptr]
10: append_here-------->[ptr]
11: link_row ........
12: . .
13: . [ptr]
14: ...........>[link to the next chunk]
15:
16: */
17:
18: #ifndef PA_ARRAY_H
19: #define PA_ARRAY_H
20:
21: #include <stddef.h>
22:
1.13 paf 23: #include "pa_pool.h"
1.1 paf 24: #include "pa_types.h"
1.11 paf 25: #include "pa_string.h"
1.1 paf 26:
1.13 paf 27: class Array : public Pooled {
1.1 paf 28: public:
1.7 paf 29:
1.11 paf 30: typedef void Item;
1.10 paf 31:
1.1 paf 32: enum {
1.7 paf 33: CR_INITIAL_ROWS_DEFAULT=10,
1.1 paf 34: CR_GROW_PERCENT=60
35: };
36:
1.6 paf 37: public:
38:
1.11 paf 39: Array(Pool& apool, int initial_rows=CR_INITIAL_ROWS_DEFAULT);
1.7 paf 40:
1.12 paf 41: int size() const { return fused_rows; }
42: Array& operator += (const Item *src);
43: Array& append_array(const Array& src);
1.14 ! paf 44: const Item *raw_get(int index) const {
! 45: // considering these true:
! 46: // index increments from 0 to size()-1
! 47: // index>=0 && index<size()
! 48: // index>=cache_chunk_base
! 49:
! 50: // next chunk will be with "index" row
! 51: if(!(index<cache_chunk_base+cache_chunk->count)) {
! 52: int count=cache_chunk->count;
! 53: cache_chunk_base+=count;
! 54: cache_chunk=cache_chunk->rows[count].link;
! 55: }
! 56:
! 57: return cache_chunk->rows[index-cache_chunk_base].item;
! 58: }
! 59:
1.12 paf 60: const Item *get(int index) const;
61: const char *get_cstr(int index) const {
62: return static_cast<const char *>(get(index));
63: }
64: const String *get_string(int index) const {
65: return static_cast<const String *>(get(index));
66: }
1.1 paf 67:
1.7 paf 68: private:
69:
1.1 paf 70: struct Chunk {
71: // the number of rows in chunk
72: int count;
73: union Row {
1.12 paf 74: const Item *item;
1.1 paf 75: Chunk *link; // link to the next chunk in chain
76: } rows[1];
77: // next rows are here
78: }
79: *head; // the head chunk of the chunk chain
80:
1.5 paf 81: // last allocated chunk
82: // helps appending Arrays
83: Chunk *tail;
84:
1.1 paf 85: // next append would write to this record
86: Chunk::Row *append_here;
87:
88: // the address of place where lies address
89: // of the link to the next chunk to allocate
90: Chunk::Row *link_row;
91:
92: private:
1.7 paf 93:
1.1 paf 94: // array size
95: int fused_rows;
96:
1.12 paf 97: mutable int cache_chunk_base;
98: mutable Chunk *cache_chunk;
1.2 paf 99:
1.1 paf 100: private:
101:
102: bool chunk_is_full() {
103: return append_here == link_row;
104: }
1.5 paf 105: void expand(int chunk_rows);
1.2 paf 106:
1.1 paf 107: private: //disabled
108:
1.11 paf 109: //Array(Array&) { }
1.12 paf 110: Array& operator = (const Array&) { return *this; }
1.1 paf 111: };
112:
113: #endif
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