digitalcoupon.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
  Copyright (C) 2007 Cristina Duminuco
  Copyright (C) 2007 Giorgio Facchinetti
 
 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.
*/
 
#ifndef quantlib_digital_coupon_hpp
#define quantlib_digital_coupon_hpp
 
#include <ql/cashflows/floatingratecoupon.hpp>
#include <ql/cashflows/couponpricer.hpp>
#include <ql/cashflows/replication.hpp>
#include <ql/position.hpp>
#include <ql/utilities/null.hpp>
 
namespace QuantLib {
 
 
    class DigitalCoupon : public FloatingRateCoupon {
      public:
 
 
        DigitalCoupon(const ext::shared_ptr<FloatingRateCoupon>& underlying,
                      Rate callStrike = Null<Rate>(),
                      Position::Type callPosition = Position::Long,
                      bool isCallITMIncluded = false,
                      Rate callDigitalPayoff = Null<Rate>(),
                      Rate putStrike = Null<Rate>(),
                      Position::Type putPosition = Position::Long,
                      bool isPutITMIncluded = false,
                      Rate putDigitalPayoff = Null<Rate>(),
                      ext::shared_ptr<DigitalReplication> replication = {},
                      bool nakedOption = false);
 
 
        void deepUpdate() override;
 
        void performCalculations() const override;
 
        Rate rate() const override;
        Rate convexityAdjustment() const override;
 
 
        Rate callStrike() const;
        Rate putStrike() const;
        Rate callDigitalPayoff() const;
        Rate putDigitalPayoff() const;
        bool hasPut() const { return hasPutStrike_; }
        bool hasCall() const {return hasCallStrike_; }
        bool hasCollar() const {return (hasCallStrike_ && hasPutStrike_); }
        bool isLongPut() const { return (putCsi_==1.); }
        bool isLongCall() const { return (callCsi_==1.); }
        ext::shared_ptr<FloatingRateCoupon> underlying() const { return underlying_; }
        Rate callOptionRate() const;
        Rate putOptionRate() const;
 
        void accept(AcyclicVisitor&) override;
 
        void setPricer(const ext::shared_ptr<FloatingRateCouponPricer>& pricer) override {
            if (pricer_ != nullptr)
                unregisterWith(pricer_);
            pricer_ = pricer;
            if (pricer_ != nullptr)
                registerWith(pricer_);
            update();
            underlying_->setPricer(pricer);
        }
 
        protected:
 
 
        ext::shared_ptr<FloatingRateCoupon> underlying_;
        Rate callStrike_;
        Rate putStrike_;
        Real callCsi_ = 0.;
        Real putCsi_ = 0.;
        bool isCallATMIncluded_;
        bool isPutATMIncluded_;
        bool isCallCashOrNothing_ = false;
        bool isPutCashOrNothing_ = false;
        Rate callDigitalPayoff_;
        Rate putDigitalPayoff_;
        Real callLeftEps_, callRightEps_;
        Real putLeftEps_, putRightEps_;
        bool hasPutStrike_ = false, hasCallStrike_ = false;
        Replication::Type replicationType_;
        bool nakedOption_;
 
      private:
        Rate callPayoff() const;
        Rate putPayoff() const;
 
    };
 
}
 
#endif