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/*
Copyright (C) 2000, 2001, 2002 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 ferdinando@ametrano.net
The license is also available online at http://quantlib.org/html/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 processingiterator.hpp
\brief Iterator mapping a unary function to an underlying sequence
\fullpath
ql/Utilities/%processingiterator.hpp
*/
// $Id: processingiterator.hpp,v 1.4 2002/01/16 14:40:56 nando Exp $
#ifndef quantlib_processing_iterator_h
#define quantlib_processing_iterator_h
#include <iterator>
namespace QuantLib {
namespace Utilities {
//! Iterator mapping a unary function to an underlying sequence
/*! This iterator advances an underlying iterator and returns the
values obtained by applying a unary function to the values such
iterator points to.
This class was implemented based on Christopher Baus and Thomas
Becker, <i>Custom Iterators for the STL</i>, included in the
proceedings of the First Workshop on C++ Template Programming,
Erfurt, Germany, 2000 (http://www.oonumerics.org/tmpw00/)
*/
template <class Iterator, class UnaryFunction>
class processing_iterator : public QL_ITERATOR<
typename QL_ITERATOR_TRAITS<Iterator>::iterator_category,
typename UnaryFunction::result_type,
typename QL_ITERATOR_TRAITS<Iterator>::difference_type,
const typename UnaryFunction::result_type*,
const typename UnaryFunction::result_type&>
{
public:
/* These typedefs are needed even though inherited from
QL_ITERATOR (see 14.6.2.3 of the standard). */
typedef typename UnaryFunction::result_type value_type;
typedef typename QL_ITERATOR_TRAITS<Iterator>::difference_type
difference_type;
typedef const value_type* pointer;
typedef const value_type& reference;
// constructor
processing_iterator(const Iterator&, const UnaryFunction&);
//! \name Dereferencing
//@{
reference operator*() const;
pointer operator->() const;
//@}
//! \name Random access
//@{
value_type operator[](int ) const;
//@}
//! \name Increment and decrement
//@{
processing_iterator& operator++();
processing_iterator operator++(int );
processing_iterator& operator--();
processing_iterator operator--(int );
processing_iterator& operator+=(difference_type);
processing_iterator& operator-=(difference_type);
processing_iterator operator+(difference_type);
processing_iterator operator-(difference_type);
//@}
//! \name Difference
//@{
difference_type operator-(
const processing_iterator<Iterator,UnaryFunction>&);
//@}
//! \name Comparisons
//@{
bool operator==(const processing_iterator<Iterator,UnaryFunction>&);
bool operator!=(const processing_iterator<Iterator,UnaryFunction>&);
bool operator< (const processing_iterator<Iterator,UnaryFunction>&);
bool operator> (const processing_iterator<Iterator,UnaryFunction>&);
bool operator<=(const processing_iterator<Iterator,UnaryFunction>&);
bool operator>=(const processing_iterator<Iterator,UnaryFunction>&);
//@}
private:
Iterator it_;
UnaryFunction f_;
mutable value_type x_;
};
//! helper function to create processing iterators
/*! \relates processing_iterator */
template <class Iterator, class UnaryFunction>
processing_iterator<Iterator,UnaryFunction>
make_processing_iterator(Iterator it, UnaryFunction p);
// inline definitions
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>::processing_iterator(
const Iterator& it, const UnaryFunction& f)
: it_(it), f_(f) {}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>&
processing_iterator<Iterator,UnaryFunction>::operator++() {
++it_;
return *this;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>
processing_iterator<Iterator,UnaryFunction>::operator++(int ) {
processing_iterator<Iterator,UnaryFunction> temp = *this;
++it_;
return temp;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>&
processing_iterator<Iterator,UnaryFunction>::operator--() {
--it_;
return *this;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>
processing_iterator<Iterator,UnaryFunction>::operator--(int ) {
processing_iterator<Iterator,UnaryFunction> temp = *this;
--it_;
return temp;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>&
processing_iterator<Iterator,UnaryFunction>::operator+=(
processing_iterator<Iterator,UnaryFunction>::difference_type i) {
it_+=i;
return *this;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>&
processing_iterator<Iterator,UnaryFunction>::operator-=(
processing_iterator<Iterator,UnaryFunction>::difference_type i) {
it_-=i;
return *this;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>::reference
processing_iterator<Iterator,UnaryFunction>::operator*() const {
x_ = f_(*it_);
return x_;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>::pointer
processing_iterator<Iterator,UnaryFunction>::operator->() const {
x_ = f_(*it_);
return &x_;
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>::value_type
processing_iterator<Iterator,UnaryFunction>::operator[](int i) const {
return *(*this+i);
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>
processing_iterator<Iterator,UnaryFunction>::operator+(
processing_iterator<Iterator,UnaryFunction>::difference_type i) {
return processing_iterator<Iterator,UnaryFunction>(it_+i,f_);
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>
processing_iterator<Iterator,UnaryFunction>::operator-(
processing_iterator<Iterator,UnaryFunction>::difference_type i) {
return processing_iterator<Iterator,UnaryFunction>(it_-i,f_);
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>::difference_type
processing_iterator<Iterator,UnaryFunction>::operator-(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_-i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator==(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ == i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator!=(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ != i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator<(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ < i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator>(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ > i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator<=(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ <= i.it_);
}
template <class Iterator, class UnaryFunction>
inline bool processing_iterator<Iterator,UnaryFunction>::operator>=(
const processing_iterator<Iterator,UnaryFunction>& i) {
return (it_ >= i.it_);
}
template <class Iterator, class UnaryFunction>
inline processing_iterator<Iterator,UnaryFunction>
make_processing_iterator(Iterator it, UnaryFunction p) {
return processing_iterator<Iterator,UnaryFunction>(it,p);
}
}
}
#endif
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