/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 Copyright (C) 2003 RiskMap 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 simpledaycounter.hpp

     \brief Simple day counter for reproducing theoretical calculations

*/

#ifndef quantlib_simple_day_counter_hpp

#define quantlib_simple_day_counter_hpp

#include <ql/time/daycounter.hpp>

namespace QuantLib {

    //! Simple day counter for reproducing theoretical calculations.

    /*! This day counter tries to ensure that whole-month distances

        are returned as a simple fraction, i.e., 1 year = 1.0,

        6 months = 0.5, 3 months = 0.25 and so forth.

        \warning this day counter should be used together with

                 NullCalendar, which ensures that dates at whole-month

                 distances share the same day of month. It is <b>not</b>

                 guaranteed to work with any other calendar.

        \ingroup daycounters

        \test the correctness of the results is checked against known

              good values.

    */

    class SimpleDayCounter : public DayCounter {

      private:

        class Impl final : public DayCounter::Impl {

          public:

            std::string name() const override { return "Simple"; }

            Date::serial_type dayCount(const Date& d1, const Date& d2) const override;

            Time

            yearFraction(const Date& d1, const Date& d2, const Date&, const Date&) const override;

        };

      public:

        SimpleDayCounter()

        : DayCounter(ext::shared_ptr<DayCounter::Impl>(

                                             new SimpleDayCounter::Impl())) {}

    };

}

#endif