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

 Copyright (C) 2003 Ferdinando Ametrano
 Copyright (C) 2001, 2002, 2003 Sadruddin Rejeb

 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

 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 exercise.hpp
    \brief Option exercise classes and payoff function

#ifndef quantlib_exercise_type_h
#define quantlib_exercise_type_h

#include <ql/date.hpp>
#include <vector>

namespace QuantLib {

    //! Base exercise class
00034     class Exercise {
        enum Type { Undefined = -1, American, Bermudan, European };
        // constructor
        Exercise(Type type = Undefined) : type_(type) {}
        virtual ~Exercise() {}
        // inspectors
        bool isNull() const { return type_ == Undefined; }
        Type type() const { return type_; }
        Date date(Size index) const { return dates_[index]; }
        const std::vector<Date>& dates() const { return dates_; }
        Date lastDate() const { return dates_.back(); }
        std::vector<Date> dates_;
        Type type_;

    //! Early-exercise base class
    /*! The payoff can be at exercise (default case) or at expiry

        \todo derive a plain American Exercise class (no
              earliestDate, no payoffAtExpiry)
00057     class EarlyExercise : public Exercise {
        EarlyExercise(Type type = Undefined,
                      bool payoffAtExpiry = false)
        : Exercise(type), payoffAtExpiry_(payoffAtExpiry) {}
        bool payoffAtExpiry() const { return payoffAtExpiry_; }
        bool payoffAtExpiry_;

    //! American exercise
    /*! An American option can be exercised at any time between two predefined

        \todo check that everywhere the American condition is applied
              from earliestDate and not earlier

00075     class AmericanExercise : public EarlyExercise {
        AmericanExercise(const Date& earliestDate,
                         const Date& latestDate,
                         bool payoffAtExpiry = false);

    //! Bermudan exercise
    /*! A Bermudan option can only be exercised at a set of fixed dates.

        \todo it would be nice to have a way for making a Bermudan with
              one exercise date equivalent to an European
00088     class BermudanExercise : public EarlyExercise {
        BermudanExercise(const std::vector<Date>& dates,
                         bool payoffAtExpiry = false);

    //! European exercise
    /*! A European option can only be exercised at one (expiry) date.
00097     class EuropeanExercise : public Exercise {
        EuropeanExercise(const Date& date);



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