QuantLib: a free/open-source library for quantitative finance
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optional.hpp
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1/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2
3/*
4 Copyright (C) 2023 Jonathan Sweemer
5
6 This file is part of QuantLib, a free-software/open-source library
7 for financial quantitative analysts and developers - http://quantlib.org/
8
9 QuantLib is free software: you can redistribute it and/or modify it
10 under the terms of the QuantLib license. You should have received a
11 copy of the license along with this program; if not, please email
12 <quantlib-dev@lists.sf.net>. The license is also available online at
13 <http://quantlib.org/license.shtml>.
14
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the license for more details.
18*/
19
20/*! \file optional.hpp
21 \brief Maps optional to either the boost or std implementation
22*/
23
24#ifndef quantlib_optional_hpp
25#define quantlib_optional_hpp
26
27#include <ql/qldefines.hpp>
28
29#if defined(QL_USE_STD_OPTIONAL)
30#include <optional>
31#else
32#include <boost/optional.hpp>
33#endif
34
35namespace QuantLib {
36
37 namespace ext {
38
39 #if defined(QL_USE_STD_OPTIONAL)
40 using std::optional; // NOLINT(misc-unused-using-decls)
41 // here we can assume C++17
42 inline constexpr const std::nullopt_t& nullopt = std::nullopt;
43 #else
44 using boost::optional; // NOLINT(misc-unused-using-decls)
45 // here we can't
46 extern const boost::none_t& nullopt;
47 #endif
48
49 }
50
51}
52
53#endif
const boost::none_t & nullopt
Definition: optional.cpp:27
Definition: any.hpp:35
Global definitions and compiler switches.