blob: 6077bf021f98a246188b135454e1b32f36054f23 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/**********************************************************************
** Copyright (C) 2000 Trolltech AS. All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef INSTRUCTION_H
#define INSTRUCTION_H
/* Internal representation of data
The first four types indicate an int,
that is, Data.i, and are incompatible
with the other two types.
- Plugin is responsible for telling engine
which Rep to use at any given time
- Instructions from that plugin only
have to handle that representation
- Engine is responsible for error-checking
according to its current rep and display */
enum Representation {
rBin,
rOct,
rDec,
rHex,
rDouble,
rFraction
};
// An atom of data
union Data {
int i;
double dbl;
struct Fraction {
int numerator, denominator;
} fraction;
};
// Instruction base class
class Instruction {
public:
Instruction (int p = 0) {
precedence = p;
};
virtual ~ Instruction () {};
virtual Data eval(Data) = 0;
void setRep(Representation r) { rep = r; };
Representation rep;
Data acc;
int precedence;
};
#endif
|
