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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2013.
// (C) Copyright Gennaro Prota 2003 - 2004.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP
#define BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/container/detail/type_traits.hpp>
#include <iterator>
namespace boost {
namespace container {
template <class PseudoReference>
struct operator_arrow_proxy
{
operator_arrow_proxy(const PseudoReference &px)
: m_value(px)
{}
typedef PseudoReference element_type;
PseudoReference* operator->() const { return &m_value; }
mutable PseudoReference m_value;
};
template <class T>
struct operator_arrow_proxy<T&>
{
operator_arrow_proxy(T &px)
: m_value(px)
{}
typedef T element_type;
T* operator->() const { return const_cast<T*>(&m_value); }
T &m_value;
};
template <class Iterator, class UnaryFunction>
class transform_iterator
: public UnaryFunction
, public std::iterator
< typename Iterator::iterator_category
, typename container_detail::remove_reference<typename UnaryFunction::result_type>::type
, typename Iterator::difference_type
, operator_arrow_proxy<typename UnaryFunction::result_type>
, typename UnaryFunction::result_type>
{
public:
explicit transform_iterator(const Iterator &it, const UnaryFunction &f = UnaryFunction())
: UnaryFunction(f), m_it(it)
{}
explicit transform_iterator()
: UnaryFunction(), m_it()
{}
//Constructors
transform_iterator& operator++()
{ increment(); return *this; }
transform_iterator operator++(int)
{
transform_iterator result (*this);
increment();
return result;
}
friend bool operator== (const transform_iterator& i, const transform_iterator& i2)
{ return i.equal(i2); }
friend bool operator!= (const transform_iterator& i, const transform_iterator& i2)
{ return !(i == i2); }
/*
friend bool operator> (const transform_iterator& i, const transform_iterator& i2)
{ return i2 < i; }
friend bool operator<= (const transform_iterator& i, const transform_iterator& i2)
{ return !(i > i2); }
friend bool operator>= (const transform_iterator& i, const transform_iterator& i2)
{ return !(i < i2); }
*/
friend typename Iterator::difference_type operator- (const transform_iterator& i, const transform_iterator& i2)
{ return i2.distance_to(i); }
//Arithmetic
transform_iterator& operator+=(typename Iterator::difference_type off)
{ this->advance(off); return *this; }
transform_iterator operator+(typename Iterator::difference_type off) const
{
transform_iterator other(*this);
other.advance(off);
return other;
}
friend transform_iterator operator+(typename Iterator::difference_type off, const transform_iterator& right)
{ return right + off; }
transform_iterator& operator-=(typename Iterator::difference_type off)
{ this->advance(-off); return *this; }
transform_iterator operator-(typename Iterator::difference_type off) const
{ return *this + (-off); }
typename UnaryFunction::result_type operator*() const
{ return dereference(); }
operator_arrow_proxy<typename UnaryFunction::result_type>
operator->() const
{ return operator_arrow_proxy<typename UnaryFunction::result_type>(dereference()); }
Iterator & base()
{ return m_it; }
const Iterator & base() const
{ return m_it; }
private:
Iterator m_it;
void increment()
{ ++m_it; }
void decrement()
{ --m_it; }
bool equal(const transform_iterator &other) const
{ return m_it == other.m_it; }
bool less(const transform_iterator &other) const
{ return other.m_it < m_it; }
typename UnaryFunction::result_type dereference() const
{ return UnaryFunction::operator()(*m_it); }
void advance(typename Iterator::difference_type n)
{ std::advance(m_it, n); }
typename Iterator::difference_type distance_to(const transform_iterator &other)const
{ return std::distance(other.m_it, m_it); }
};
template <class Iterator, class UnaryFunc>
transform_iterator<Iterator, UnaryFunc>
make_transform_iterator(Iterator it, UnaryFunc fun)
{
return transform_iterator<Iterator, UnaryFunc>(it, fun);
}
} //namespace container {
} //namespace boost {
#include <boost/container/detail/config_end.hpp>
#endif //#ifndef BOOST_CONTAINER_DETAIL_TRANSFORM_ITERATORS_HPP
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