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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2004, 2005 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/reference/license.html>.
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 settings.hpp
\brief global repository for run-time library settings
*/
#ifndef quantlib_settings_hpp
#define quantlib_settings_hpp
#include <ql/date.hpp>
#include <ql/Patterns/singleton.hpp>
#include <ql/Utilities/observablevalue.hpp>
namespace QuantLib {
//! global repository for run-time library settings
class Settings : public Singleton<Settings> {
friend class Singleton<Settings>;
private:
Settings() {}
class DateProxy : public ObservableValue<Date> {
public:
DateProxy();
DateProxy& operator=(const Date&);
operator Date() const;
};
#ifndef QL_PATCH_MSVC6
friend std::ostream& operator<<(std::ostream&, const DateProxy&);
#endif
public:
//! the date at which pricing is to be performed.
/*! Client code can inspect the evaluation date, as in:
\code
Date d = Settings::instance().evaluationDate();
\endcode
where today's date is returned if the evaluation date is
set to the null date (its default value;) can set it to a
new value, as in:
\code
Settings::instance().evaluationDate() = d;
\endcode
and can register with it, as in:
\code
registerWith(Settings::instance().evaluationDate());
\endcode
to be notified when it is set to a new value.
\warning a notification is not sent when the evaluation
date changes for natural causes---i.e., a date
was not explicitly set (which results in today's
date being used for pricing) and the current date
changes as the clock strikes midnight.
*/
DateProxy& evaluationDate();
const DateProxy& evaluationDate() const;
private:
DateProxy evaluationDate_;
};
// inline definitions
inline Settings::DateProxy& Settings::evaluationDate() {
return evaluationDate_;
}
inline const Settings::DateProxy& Settings::evaluationDate() const {
return evaluationDate_;
}
inline Settings::DateProxy::DateProxy() : ObservableValue<Date>(Date()) {}
inline Settings::DateProxy::operator Date() const {
if (value() == Date())
return Date::todaysDate();
else
return value();
}
inline
Settings::DateProxy& Settings::DateProxy::operator=(const Date& d) {
ObservableValue<Date>::operator=(d);
return *this;
}
#ifndef QL_PATCH_MSVC6
inline std::ostream& operator<<(std::ostream& out,
const Settings::DateProxy& p) {
return out << Date(p);
}
#endif
}
#endif
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