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
113
114
115
116
117
118
119
120
121
122
123
124
|
/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2000, 2001, 2002, 2003 RiskMap srl
Copyright (C) 2003, 2004 StatPro Italia srl
This file is part of QuantLib, a free-software/open-source library
for financial quantitative analysts and developers - http://quantlib.org/
QuantLib is free software: you can redistribute it and/or modify it
under the terms of the QuantLib license. You should have received a
copy of the license along with this program; if not, please email
<quantlib-dev@lists.sf.net>. The license is also available online at
<http://quantlib.org/license.shtml>.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the license for more details.
*/
/*! \file null.hpp
\brief null values
*/
#ifndef quantlib_null_hpp
#define quantlib_null_hpp
#include <ql/types.hpp>
namespace QuantLib {
//! template class providing a null value for a given type.
template <class Type>
class Null {
public:
Null() {}
operator Type() const { return Type(); }
};
#if !defined(__DOXYGEN__)
/* here we're trying to cover a number of types that one would possibly
use as Real, Integer and such. Were one to add his own user-defined
type, a suitable Null specialization should be added. */
template <>
class Null<int> {
public:
Null() {}
operator int() const { return int(QL_NULL_INTEGER); }
};
template <>
class Null<long> {
public:
Null() {}
operator long() const { return long(QL_NULL_INTEGER); }
};
template <>
class Null<unsigned int> {
public:
Null() {}
operator unsigned int() const {
return (unsigned int)(QL_NULL_INTEGER);
}
};
template <>
class Null<unsigned long> {
public:
Null() {}
operator unsigned long() const {
return (unsigned long)(QL_NULL_INTEGER);
}
};
#if defined(QL_HAVE_LONG_LONG)
template <>
class Null<long long> {
public:
Null() {}
operator long long() const { return (long long)(QL_NULL_INTEGER); }
};
template <>
class Null<unsigned long long> {
public:
Null() {}
operator unsigned long long() const {
return (unsigned long long)(QL_NULL_INTEGER);
}
};
#endif
template <>
class Null<float> {
public:
Null() {}
operator float() const { return float(QL_NULL_REAL); }
};
template <>
class Null<double> {
public:
Null() {}
operator double() const { return double(QL_NULL_REAL); }
};
template <>
class Null<long double> {
public:
Null() {}
operator long double() const { return (long double)(QL_NULL_REAL); }
};
#endif
}
#endif
|
