QuantLib: a free/open-source library for quantitative finance
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impliedvoltermstructure.hpp
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1/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2
3/*
4 Copyright (C) 2003 Ferdinando Ametrano
5
6 This file is part of QuantLib, a free-software/open-source library
7 for financial quantitative analysts and developers - http://quantlib.org/
8
9 QuantLib is free software: you can redistribute it and/or modify it
10 under the terms of the QuantLib license. You should have received a
11 copy of the license along with this program; if not, please email
12 <quantlib-dev@lists.sf.net>. The license is also available online at
13 <http://quantlib.org/license.shtml>.
14
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the license for more details.
18*/
19
20/*! \file impliedvoltermstructure.hpp
21 \brief Implied Black Vol Term Structure
22*/
23
24#ifndef quantlib_implied_vol_term_structure_hpp
25#define quantlib_implied_vol_term_structure_hpp
26
28#include <utility>
29
30namespace QuantLib {
31
32 //! Implied vol term structure at a given date in the future
33 /*! The given date will be the implied reference date.
34 \note This term structure will remain linked to the original
35 structure, i.e., any changes in the latter will be reflected
36 in this structure as well.
37
38 \warning It doesn't make financial sense to have an
39 asset-dependant implied Vol Term Structure. This
40 class should be used with term structures that are
41 time dependant only.
42 */
44 public:
46 //! \name TermStructure interface
47 //@{
48 DayCounter dayCounter() const override { return originalTS_->dayCounter(); }
49 Date maxDate() const override;
50 //@}
51 //! \name VolatilityTermStructure interface
52 //@{
53 Real minStrike() const override;
54 Real maxStrike() const override;
55 //@}
56 //! \name Visitability
57 //@{
58 void accept(AcyclicVisitor&) override;
59 //@}
60 protected:
61 Real blackVarianceImpl(Time t, Real strike) const override;
62
63 private:
65 };
66
67
68 // inline definitions
69
71 Handle<BlackVolTermStructure> originalTS, const Date& referenceDate)
72 : BlackVarianceTermStructure(referenceDate), originalTS_(std::move(originalTS)) {
74 }
75
77 return originalTS_->maxDate();
78 }
79
81 return originalTS_->minStrike();
82 }
83
85 return originalTS_->maxStrike();
86 }
87
89 auto* v1 = dynamic_cast<Visitor<ImpliedVolTermStructure>*>(&v);
90 if (v1 != nullptr)
91 v1->visit(*this);
92 else
94 }
95
97 Real strike) const {
98 /* timeShift (and/or variance) variance at evaluation date
99 cannot be cached since the original curve could change
100 between invocations of this method */
101 Time timeShift =
102 dayCounter().yearFraction(originalTS_->referenceDate(),
103 referenceDate());
104 /* t is relative to the current reference date
105 and needs to be converted to the time relative
106 to the reference date of the original curve */
107 return originalTS_->blackForwardVariance(timeShift,
108 timeShift+t,
109 strike,
110 true);
111 }
112
113}
114
115#endif
Black volatility term structure base classes.
degenerate base class for the Acyclic Visitor pattern
Definition: visitor.hpp:33
void accept(AcyclicVisitor &) override
Concrete date class.
Definition: date.hpp:125
day counter class
Definition: daycounter.hpp:44
Time yearFraction(const Date &, const Date &, const Date &refPeriodStart=Date(), const Date &refPeriodEnd=Date()) const
Returns the period between two dates as a fraction of year.
Definition: daycounter.hpp:128
Shared handle to an observable.
Definition: handle.hpp:41
Implied vol term structure at a given date in the future.
ImpliedVolTermStructure(Handle< BlackVolTermStructure > origTS, const Date &referenceDate)
Real minStrike() const override
the minimum strike for which the term structure can return vols
void accept(AcyclicVisitor &) override
DayCounter dayCounter() const override
the day counter used for date/time conversion
Date maxDate() const override
the latest date for which the curve can return values
Real blackVarianceImpl(Time t, Real strike) const override
Black variance calculation.
Handle< BlackVolTermStructure > originalTS_
Real maxStrike() const override
the maximum strike for which the term structure can return vols
std::pair< iterator, bool > registerWith(const ext::shared_ptr< Observable > &)
Definition: observable.hpp:228
virtual const Date & referenceDate() const
the date at which discount = 1.0 and/or variance = 0.0
Visitor for a specific class
Definition: visitor.hpp:40
virtual void visit(T &)=0
const DefaultType & t
Real Time
continuous quantity with 1-year units
Definition: types.hpp:62
QL_REAL Real
real number
Definition: types.hpp:50
Definition: any.hpp:35
STL namespace.
ext::shared_ptr< BlackVolTermStructure > v