Annotation of parser3/src/include/pa_hash.h, revision 1.16
1.1 paf 1: /*
1.16 ! paf 2: $Id: pa_hash.h,v 1.15 2001/02/21 11:10:02 paf Exp $
1.1 paf 3: */
4:
5: /*
6:
7:
8: */
9:
10: #ifndef PA_HASH_H
11: #define PA_HASH_H
12:
13: #include <stddef.h>
14:
1.14 paf 15: #include "pa_pool.h"
1.1 paf 16: #include "pa_types.h"
17: #include "pa_string.h"
18:
1.16 ! paf 19: class Hash : virtual public Pooled {
1.1 paf 20: public:
21:
1.3 paf 22: typedef String Key;
23: typedef void Value;
24:
1.8 paf 25: public:
26:
1.15 paf 27: Hash(Pool& apool,bool) : Pooled(apool) { construct(apool, true); }
28: Hash(Pool& apool) : Pooled(apool) { construct(apool, false); }
1.10 paf 29:
1.8 paf 30: // useful generic hash function
1.12 paf 31: static uint generic_code(uint aresult, const char *start, uint size);
1.8 paf 32:
33: // put a [value] under the [key]
1.13 paf 34: /*SYNCHRONIZED*/ void put(const Key& key, Value *value);
1.8 paf 35:
36: // get associated [value] by the [key]
1.15 paf 37: /*SYNCHRONIZED*/ Value *get(const Key& key) const;
1.11 paf 38:
1.13 paf 39: void put(const Key& key, int value) { put(key, reinterpret_cast<Value *>(value)); }
40: void put(const Key& key, String *value) { put(key, static_cast<Value *>(value)); }
1.11 paf 41:
1.13 paf 42: int get_int(const Key& key) { return reinterpret_cast<int>(get(key)); }
43: String *get_string(const Key& key) { return static_cast<String *>(get(key)); }
1.10 paf 44:
1.15 paf 45: protected:
46:
47: void construct(Pool& apool, bool athread_safe);
48:
1.1 paf 49: private:
50:
1.6 paf 51: // expand when these %% of size exausted
1.1 paf 52: enum {
53: THRESHOLD_PERCENT=75
54: };
55:
1.9 paf 56: // am I thread-safe?
57: bool thread_safe;
58:
1.5 paf 59: // the index of [size] in [sizes]
1.1 paf 60: int size_index;
61:
1.5 paf 62: // possible [sizes]. prime numbers
1.1 paf 63: static uint sizes[];
64: static int sizes_count;
65:
66: // number of allocated pairs
67: int size;
68:
69: // helper: expanding when used == threshold
70: int threshold;
71:
72: // used pairs
73: int used;
74:
75: // main storage
76: class Pair {
1.2 paf 77: friend Hash;
78:
1.1 paf 79: uint code;
1.15 paf 80: const Key key;
1.1 paf 81: Value *value;
82: Pair *link;
1.2 paf 83:
1.11 paf 84: void *operator new(size_t size, Pool& apool);
1.2 paf 85:
1.13 paf 86: Pair(uint acode, const Key& akey, Value *avalue, Pair *alink) :
1.1 paf 87: code(acode),
88: key(akey),
89: value(avalue),
1.2 paf 90: link(alink) {}
91: } **refs;
1.1 paf 92:
1.5 paf 93: // filled to threshold: needs expanding
94: bool full() { return used==threshold; }
95:
96: // allocate larger buffer & rehash
1.1 paf 97: void expand();
1.4 paf 98:
99: private: //disabled
100:
1.11 paf 101: //Hash(Hash&) {}
1.12 paf 102: Hash& operator = (const Hash&) { return *this; }
1.1 paf 103: };
104:
105: #endif
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