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
|
/* -*- 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
Copyright (C) 2010 Kakhkhor Abdijalilov
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
<https://www.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>
#include <type_traits>
#include <limits>
namespace QuantLib {
#ifdef QL_NULL_AS_FUNCTIONS
//! template function providing a null value for a given type.
template <typename T>
constexpr T Null() {
if constexpr (std::is_floating_point_v<T>) {
// a specific, unlikely value that should fit into any Real
return (std::numeric_limits<float>::max)();
} else if constexpr (std::is_integral_v<T>) {
// this should fit into any Integer
return (std::numeric_limits<int>::max)();
} else {
return T();
}
}
#else
//! template class providing a null value for a given type.
template <class Type>
class Null;
// default implementation for built-in types
template <typename T>
class Null {
public:
constexpr Null() = default;
constexpr operator T() const {
if constexpr (std::is_floating_point_v<T>) {
// a specific, unlikely value that should fit into any Real
return (std::numeric_limits<float>::max)();
} else if constexpr (std::is_integral_v<T>) {
// this should fit into any Integer
return (std::numeric_limits<int>::max)();
} else {
return T();
}
}
};
#endif
}
#endif
|
