blob: 5a6b4f4bba4a3ba92e4efbd37be58f64f60d5d78 (
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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "expression.h"
#include <sstream>
Expression::Expression() = default;
Expression::Expression(int number) : m_value(number)
{
}
Expression::Expression(const Expression &other)
{
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : nullptr;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : nullptr;
m_value = other.m_value;
m_operation = other.m_operation;
}
Expression &Expression::operator=(const Expression &other)
{
if (&other == this)
return *this;
delete m_operand1;
delete m_operand2;
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : nullptr;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : nullptr;
m_operation = other.m_operation;
m_value = other.m_value;
return *this;
}
Expression::~Expression()
{
delete m_operand1;
delete m_operand2;
}
Expression Expression::operator+(const Expression &other)
{
Expression expr;
expr.m_operation = Add;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator-(const Expression &other)
{
Expression expr;
expr.m_operation = Add;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator<(const Expression &other)
{
Expression expr;
expr.m_operation = LessThan;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator>(const Expression &other)
{
Expression expr;
expr.m_operation = GreaterThan;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
std::string Expression::toString() const
{
if (m_operation == None) {
std::ostringstream s;
s << m_value;
return s.str();
}
std::string result;
result += '(';
result += m_operand1->toString();
char op;
switch (m_operation) {
case Add:
op = '+';
break;
case Sub:
op = '-';
break;
case LessThan:
op = '<';
break;
case GreaterThan:
op = '<';
break;
case None: // just to avoid the compiler warning
default:
op = '?';
break;
}
result += op;
result += m_operand2->toString();
result += ')';
return result;
}
|