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trac 5816 - fix any_range requiring copyable elements.

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This commit is contained in:
Neil Groves
2014-03-02 15:35:50 +00:00
parent 3afac93b7f
commit 79d2a66831
3 changed files with 123 additions and 15 deletions
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29
include/boost/range/detail/any_iterator_interface.hpp
View File

@ -27,25 +27,40 @@ namespace boost
{
typedef typename mpl::if_<
typename is_reference<T>::type,
typename add_reference<
typename add_const<
typename remove_reference<T>::type
>::type
>::type,
typename add_const<
typename remove_reference<T>::type
>::type&,
T
>::type type;
};
template<class T>
struct mutable_reference_type_generator
{
typedef typename mpl::if_<
typename mpl::and_<
typename is_const<T>::type,
typename mpl::not_<typename is_reference<T>::type>::type
>::type,
T,
typename add_reference<T>::type
>::type type;
};
template<
class Reference
, class Buffer
>
struct any_incrementable_iterator_interface
{
typedef Reference reference;
typedef typename mutable_reference_type_generator<
Reference
>::type reference;
typedef typename const_reference_type_generator<
Reference
>::type const_reference;
typedef typename remove_const<
typename remove_reference<Reference>::type
>::type reference_as_value_type;
@ -87,7 +102,7 @@ namespace boost
virtual any_single_pass_iterator_interface<reference_as_value_type, Buffer>*
clone_reference_as_value(buffer_type& buffer) const = 0;
virtual Reference dereference() const = 0;
virtual reference dereference() const = 0;
virtual bool equal(const any_single_pass_iterator_interface& other) const = 0;
};

54
include/boost/range/detail/any_iterator_wrapper.hpp
View File

@ -19,6 +19,17 @@ namespace boost
{
namespace range_detail
{
template<class Reference, class T>
Reference dereference_cast(T& x)
{
return static_cast<Reference>(x);
}
template<class Reference, class T>
Reference dereference_cast(const T& x)
{
return static_cast<Reference>(const_cast<T&>(x));
}
template<
class WrappedIterator
, class Reference
@ -114,7 +125,13 @@ namespace boost
{
struct disabler {};
BOOST_RANGE_CONCEPT_ASSERT(( SinglePassIteratorConcept<WrappedIterator> ));
typedef any_single_pass_iterator_interface<
Reference,
Buffer
> base_type;
public:
typedef typename base_type::reference reference;
any_single_pass_iterator_wrapper()
: m_it()
@ -178,9 +195,9 @@ namespace boost
return m_it == boost::polymorphic_downcast<const any_single_pass_iterator_wrapper*>(&other)->m_it;
}
virtual Reference dereference() const
virtual reference dereference() const
{
return *m_it;
return dereference_cast<reference>(*m_it);
}
private:
@ -199,7 +216,14 @@ namespace boost
>
{
BOOST_RANGE_CONCEPT_ASSERT(( ForwardIteratorConcept<WrappedIterator> ));
typedef any_forward_iterator_interface<
Reference,
Buffer
> base_type;
public:
typedef typename base_type::reference reference;
any_forward_iterator_wrapper()
: m_it()
{}
@ -263,9 +287,9 @@ namespace boost
return m_it == boost::polymorphic_downcast<const any_forward_iterator_wrapper*>(&other)->m_it;
}
virtual Reference dereference() const
virtual reference dereference() const
{
return *m_it;
return dereference_cast<reference>(*m_it);
}
private:
WrappedIterator m_it;
@ -283,7 +307,14 @@ namespace boost
>
{
BOOST_RANGE_CONCEPT_ASSERT(( BidirectionalIteratorConcept<WrappedIterator> ));
typedef any_bidirectional_iterator_interface<
Reference,
Buffer
> base_type;
public:
typedef typename base_type::reference reference;
any_bidirectional_iterator_wrapper()
: m_it()
{
@ -353,9 +384,9 @@ namespace boost
return m_it == boost::polymorphic_downcast<const any_bidirectional_iterator_wrapper*>(&other)->m_it;
}
virtual Reference dereference() const
virtual reference dereference() const
{
return *m_it;
return dereference_cast<reference>(*m_it);
}
private:
@ -376,7 +407,14 @@ namespace boost
>
{
BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessIteratorConcept<WrappedIterator> ));
typedef any_random_access_iterator_interface<
Reference,
Difference,
Buffer
> base_type;
public:
typedef typename base_type::reference reference;
typedef Difference difference_type;
any_random_access_iterator_wrapper()
@ -457,9 +495,9 @@ namespace boost
m_it += offset;
}
virtual Reference dereference() const
virtual reference dereference() const
{
return *m_it;
return dereference_cast<reference>(*m_it);
}
virtual Difference distance_to(const any_random_access_iterator_interface<Reference, Difference, Buffer>& other) const