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simplified version of iterator_adaptor, plus fix to indirect iterator

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and addition of projection iterator


[SVN r8317]
This commit is contained in:
Jeremy Siek
2000-11-24 19:40:51 +00:00
parent 80bcc4e643
commit 31fef5252a
2 changed files with 190 additions and 80 deletions
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2
include/boost/pending/integer_range.hpp
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@ -54,7 +54,7 @@ struct integer_range {
#ifdef BOOST_USE_ITERATOR_ADAPTORS
typedef iterator_adaptor<IntegerType,
counting_iterator_policies<IntegerType>,
counting_iterator_traits<IntegerType>, IntegerType> iterator;
counting_iterator_traits<IntegerType> > iterator;
#else
typedef int_iterator<IntegerType> iterator;
#endif

262
include/boost/pending/iterator_adaptors.hpp
View File

@ -13,9 +13,8 @@
#ifndef BOOST_ITERATOR_ADAPTOR_DWA053000_HPP_
#define BOOST_ITERATOR_ADAPTOR_DWA053000_HPP_
#include <iterator>
#include <boost/iterator.hpp>
#include <boost/utility.hpp>
#include <boost/operators.hpp>
#include <boost/compressed_pair.hpp>
// I was having some problems with VC6. I couldn't tell whether our hack for
@ -144,22 +143,17 @@ inline bool operator<=(const iterator_comparisons<D1,Base1>& xb,
// Traits - a class satisfying the same requirements as a specialization of
// std::iterator_traits for the resulting iterator.
//
// NonconstIterator - the corresponding non-const iterator type for
// Iterator, if any. You don't need to supply this if you are not make a
// const/non-const iterator pair.
//
template <class Iterator, class Policies,
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
class Traits,
class Traits
#else
class Traits = std::iterator_traits<Iterator>,
class Traits = std::iterator_traits<Iterator>
#endif
class NonconstIterator = Iterator
>
struct iterator_adaptor :
#ifdef BOOST_RELOPS_AMBIGUITY_BUG
iterator_comparisons<
iterator_adaptor<Iterator,Policies,Traits,NonconstIterator>,
iterator_adaptor<Iterator,Policies,Traits>,
#endif
boost::iterator<typename Traits::iterator_category,
typename Traits::value_type, typename Traits::difference_type,
@ -168,7 +162,7 @@ struct iterator_adaptor :
>
#endif
{
typedef iterator_adaptor<Iterator, Policies,Traits,NonconstIterator> Self;
typedef iterator_adaptor<Iterator, Policies, Traits> Self;
public:
typedef typename Traits::difference_type difference_type;
typedef typename Traits::value_type value_type;
@ -179,34 +173,14 @@ public:
iterator_adaptor() { }
iterator_adaptor(const iterator_type& iter, const Policies& p =Policies())
iterator_adaptor(const Iterator& iter, const Policies& p = Policies())
: m_iter_p(iter, p) {}
#ifdef BOOST_MSVC6_MEMBER_TEMPLATES
template <class MutableIterator, class OtherTraits>
iterator_adaptor(const iterator_adaptor<MutableIterator, Policies, OtherTraits, NonconstIterator>& rhs)
: m_iter_p(rhs.iter(), rhs.policies()) {}
template <class MutableIterator, class OtherTraits>
Self& operator=(const iterator_adaptor<MutableIterator, Policies, OtherTraits, NonconstIterator>& rhs)
{
iter() = rhs.iter();
policies() = rhs.policies();
return *this;
template <class OtherIter, class OtherTraits>
iterator_adaptor (const iterator_adaptor<OtherIter, Policies,
OtherTraits>& src)
: m_iter_p(src.iter(), src.policies()) {
}
#else
template <class OtherTraits>
iterator_adaptor(const iterator_adaptor<NonconstIterator, Policies, OtherTraits, NonconstIterator>& rhs)
: m_iter_p(rhs.iter(), rhs.policies()) {}
template <class OtherTraits>
Self& operator=(const iterator_adaptor<NonconstIterator, Policies, OtherTraits, NonconstIterator>& rhs)
{
iter() = rhs.iter();
policies() = rhs.policies();
return *this;
}
#endif
reference operator*() const {
return policies().dereference(type<reference>(), iter());
@ -281,73 +255,73 @@ public: // too many compilers have trouble when these are private.
const Iterator& iter() const { return m_iter_p.first(); }
};
template <class Iterator, class Policies, class Traits, class NonconstIterator>
iterator_adaptor<Iterator,Policies,Traits,NonconstIterator>
operator-(iterator_adaptor<Iterator,Policies,Traits,NonconstIterator> p, const typename Traits::difference_type x)
template <class Iterator, class Policies, class Traits>
iterator_adaptor<Iterator,Policies,Traits>
operator-(iterator_adaptor<Iterator,Policies,Traits> p, const typename Traits::difference_type x)
{
return p -= x;
}
template <class Iterator, class Policies, class Traits, class NonconstIterator>
iterator_adaptor<Iterator,Policies,Traits,NonconstIterator>
operator+(iterator_adaptor<Iterator,Policies,Traits,NonconstIterator> p, const typename Traits::difference_type x)
template <class Iterator, class Policies, class Traits>
iterator_adaptor<Iterator,Policies,Traits>
operator+(iterator_adaptor<Iterator,Policies,Traits> p, typename Traits::difference_type x)
{
return p += x;
}
template <class Iterator, class Policies, class Traits, class NonconstIterator>
iterator_adaptor<Iterator,Policies,Traits,NonconstIterator>
operator+(const typename Traits::difference_type x, iterator_adaptor<Iterator,Policies,Traits,NonconstIterator> p)
template <class Iterator, class Policies, class Traits>
iterator_adaptor<Iterator,Policies,Traits>
operator+(typename Traits::difference_type x, iterator_adaptor<Iterator,Policies,Traits> p)
{
return p += x;
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
typename Traits1::difference_type operator-(
const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x,
const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y )
const iterator_adaptor<Iterator1,Policies,Traits1>& x,
const iterator_adaptor<Iterator2,Policies,Traits2>& y )
{
typedef typename Traits1::difference_type difference_type;
return x.policies().distance(type<difference_type>(), y.iter(), x.iter());
}
#ifndef BOOST_RELOPS_AMBIGUITY_BUG
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator==(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x, const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator==(const iterator_adaptor<Iterator1,Policies,Traits1>& x, const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return x.policies().equal(x.iter(), y.iter());
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator<(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x, const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator<(const iterator_adaptor<Iterator1,Policies,Traits1>& x, const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return x.policies().less(x.iter(), y.iter());
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator>(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x,
const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator>(const iterator_adaptor<Iterator1,Policies,Traits1>& x,
const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return x.policies().less(y.iter(), x.iter());
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator>=(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x, const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator>=(const iterator_adaptor<Iterator1,Policies,Traits1>& x, const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return !x.policies().less(x.iter(), y.iter());
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator<=(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x,
const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator<=(const iterator_adaptor<Iterator1,Policies,Traits1>& x,
const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return !x.policies().less(y.iter(), x.iter());
}
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2, class NonconstIterator>
template <class Iterator1, class Iterator2, class Policies, class Traits1, class Traits2>
inline bool
operator!=(const iterator_adaptor<Iterator1,Policies,Traits1,NonconstIterator>& x,
const iterator_adaptor<Iterator2,Policies,Traits2,NonconstIterator>& y) {
operator!=(const iterator_adaptor<Iterator1,Policies,Traits1>& x,
const iterator_adaptor<Iterator2,Policies,Traits2>& y) {
return !x.policies().equal(x.iter(), y.iter());
}
#endif
@ -368,8 +342,8 @@ template <class Iterator, class ConstIterator,
class iterator_adaptors
{
public:
typedef iterator_adaptor<Iterator, Policies, Traits, Iterator> iterator;
typedef iterator_adaptor<ConstIterator, Policies, ConstTraits, Iterator>
typedef iterator_adaptor<Iterator, Policies, Traits> iterator;
typedef iterator_adaptor<ConstIterator, Policies, ConstTraits>
const_iterator;
};
@ -412,8 +386,8 @@ struct transform_iterator
typedef transform_iterator_traits<AdaptableUnaryFunction,Traits>
TransTraits;
typedef iterator_adaptor<Iterator,
transform_iterator_policies<AdaptableUnaryFunction>, TransTraits,
Iterator> type;
transform_iterator_policies<AdaptableUnaryFunction>, TransTraits>
type;
};
@ -449,27 +423,62 @@ struct indirect_traits
typedef typename IndirectTraits::iterator_category iterator_category;
};
template <class IndirectIterator, class ConstIndirectIterator,
template <class IndirectIterator, class Iterator,
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
class IndirectTraits,
class ConstIndirectTraits,
class Traits
#else
class IndirectTraits =
std::iterator_traits<IndirectIterator>,
class ConstIndirectTraits =
std::iterator_traits<ConstIndirectIterator>,
class Traits =
std::iterator_traits<typename IndirectTraits::value_type>
class Traits = std::iterator_traits<Iterator>
#endif
>
struct indirect_iterator
{
typedef typename Traits::value_type ValueType;
typedef iterator_adaptor<IndirectIterator,
indirect_iterator_policies,
indirect_traits<IndirectIterator, IndirectTraits, Traits>
> type;
};
template <class IndirectIterator, class ConstIterator,
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
class IndirectTraits,
class ConstTraits
#else
class IndirectTraits =
std::iterator_traits<IndirectIterator>,
class ConstTraits = std::iterator_traits<ConstIterator>
#endif
>
struct const_indirect_iterator
{
typedef iterator_adaptor<IndirectIterator,
indirect_iterator_policies,
indirect_traits<IndirectIterator, IndirectTraits, ConstTraits>
> type;
};
template <class IndirectIterator,
class Iterator, // Mutable
class ConstIterator, // Immutable
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
class IndirectTraits,
class Traits,
class ConstTraits
#else
class IndirectTraits = std::iterator_traits<IndirectIterator>,
class Traits = std::iterator_traits<Iterator>,
class ConstTraits = std::iterator_traits<ConstIterator>
#endif
>
struct indirect_iterators
{
typedef typename IndirectTraits::value_type Iterator;
typedef typename Traits::value_type ValueType;
typedef iterator_adaptors<IndirectIterator, ConstIndirectIterator,
typedef iterator_adaptors<IndirectIterator, IndirectIterator,
indirect_traits<IndirectIterator, IndirectTraits, Traits>,
indirect_traits<ConstIndirectIterator, ConstIndirectTraits, Traits>,
indirect_traits<IndirectIterator, IndirectTraits, ConstTraits>,
indirect_iterator_policies
> Adaptors;
typedef typename Adaptors::iterator iterator;
@ -512,6 +521,32 @@ struct reverse_iterator_policies
{ return y < x; }
};
template <class Iterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class Traits = std::iterator_traits<Iterator>
#else
class Traits
#endif
>
struct reverse_iterator
{
typedef iterator_adaptor<Iterator, reverse_iterator_policies,
Traits> type;
};
template <class ConstIterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class ConstTraits = std::iterator_traits<ConstIterator>
#else
class ConstTraits
#endif
>
struct const_reverse_iterator
{
typedef iterator_adaptor<ConstIterator, reverse_iterator_policies,
ConstTraits> type;
};
template <class Iterator, class ConstIterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class Traits = std::iterator_traits<Iterator>,
@ -529,7 +564,82 @@ struct reverse_iterators
typedef typename Adaptor::const_iterator const_iterator;
};
template <class AdaptableUnaryFunction>
struct projection_iterator_policies :
public default_iterator_policies {
template <class Reference, class Iterator>
Reference dereference (type<Reference>, Iterator const& it) const {
return AdaptableUnaryFunction()(*it);
}
};
template <class AdaptableUnaryFunction, class Traits>
struct projection_iterator_traits {
typedef typename AdaptableUnaryFunction::result_type value_type;
typedef value_type& reference;
typedef value_type* pointer;
typedef typename Traits::difference_type difference_type;
typedef typename Traits::iterator_category iterator_category;
};
template <class AdaptableUnaryFunction, class Traits>
struct const_projection_iterator_traits {
typedef typename AdaptableUnaryFunction::result_type value_type;
typedef value_type const& reference;
typedef value_type const* pointer;
typedef typename Traits::difference_type difference_type;
typedef typename Traits::iterator_category iterator_category;
};
template <class AdaptableUnaryFunction, class Iterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class Traits = std::iterator_traits<Iterator>
#else
class Traits
#endif
>
struct projection_iterator {
typedef projection_iterator_traits<AdaptableUnaryFunction, Traits>
Projection_Traits;
typedef iterator_adaptor<Iterator,
projection_iterator_policies<AdaptableUnaryFunction>,
Projection_Traits> type;
};
template <class AdaptableUnaryFunction, class Iterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class Traits = std::iterator_traits<Iterator>
#else
class Traits
#endif
>
struct const_projection_iterator {
typedef const_projection_iterator_traits<AdaptableUnaryFunction,
Traits> Projection_Traits;
typedef iterator_adaptor<Iterator,
projection_iterator_policies<AdaptableUnaryFunction>,
Projection_Traits> type;
};
template <class AdaptableUnaryFunction, class Iterator, class ConstIterator,
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
class Traits = std::iterator_traits<Iterator>,
class ConstTraits = std::iterator_traits<ConstIterator>
#else
class Traits,
class ConstTraits
#endif
>
struct projection_iterators {
typedef projection_iterator_traits<AdaptableUnaryFunction, Traits>
Projection_Traits;
typedef const_projection_iterator_traits<AdaptableUnaryFunction,
ConstTraits> Const_Projection_Traits;
typedef iterator_adaptors<Iterator, ConstIterator,
Projection_Traits, Const_Projection_Traits,
projection_iterator_policies<AdaptableUnaryFunction> > Adaptors;
typedef typename Adaptors::iterator iterator;
typedef typename Adaptors::const_iterator const_iterator;
};
} // namespace boost
#endif