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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2023 Jonathan Sweemer
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 optional.hpp
\brief Maps optional to either the boost or std implementation
*/
#ifndef quantlib_optional_hpp
#define quantlib_optional_hpp
#include <ql/qldefines.hpp>
#if defined(QL_USE_STD_OPTIONAL)
#include <optional>
#else
// Deprecated in version 1.39
#pragma message("Warning: using boost::optional is deprecated. Enable std::optional instead.")
#include <boost/optional.hpp>
#endif
namespace QuantLib::ext {
#if defined(QL_USE_STD_OPTIONAL)
using std::optional; // NOLINT(misc-unused-using-decls)
inline constexpr const std::nullopt_t& nullopt = std::nullopt;
#else
using boost::optional; // NOLINT(misc-unused-using-decls)
inline constexpr const boost::none_t& nullopt = boost::none;
#endif
}
#endif
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