forked from boostorg/iterator
New archetypes
[SVN r1231]
This commit is contained in:
Thomas Witt
237
include/boost/iterator/iterator_archetypes.hpp
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237
include/boost/iterator/iterator_archetypes.hpp
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// (C) Copyright Jeremy Siek 2002. Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#ifndef BOOST_ITERATOR_ARCHETYPES_HPP
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#define BOOST_ITERATOR_ARCHETYPES_HPP
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#include <boost/iterator/iterator_categories.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/operators.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <cstddef>
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namespace boost
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{
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template <class Value, class AccessCategory>
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struct access_archetype;
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template <class Derived, class Value, class AccessCategory, class TraversalCategory>
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struct traversal_archetype;
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namespace detail {
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template <class T>
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struct assign_proxy
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{
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assign_proxy& operator=(T);
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};
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template <class T>
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struct read_write_proxy :
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assign_proxy<T>
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{
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operator T();
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};
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template <class T>
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struct arrow_proxy
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{
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T const* operator->() const;
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};
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struct no_operator_brackets {};
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template <class ValueType>
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struct readable_operator_brackets
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{
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ValueType operator[](std::ptrdiff_t n) const;
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};
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template <class ValueType>
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struct writable_operator_brackets
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{
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read_write_proxy<ValueType> operator[](std::ptrdiff_t n) const;
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};
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template <class Value, class AccessCategory, class TraversalCategory>
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struct operator_brackets :
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mpl::if_< is_tag<random_access_traversal_tag, TraversalCategory>,
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mpl::if_< is_tag<writable_iterator_tag, AccessCategory>,
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writable_operator_brackets< Value >,
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mpl::if_< is_tag<readable_iterator_tag, AccessCategory>,
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readable_operator_brackets<Value>,
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no_operator_brackets > >,
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no_operator_brackets >::type
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{
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};
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template <class Derived, class Value, class TraversalCategory>
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struct traversal_archetype_;
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template<class Derived, class Value>
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struct traversal_archetype_<Derived, Value, incrementable_iterator_tag>
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{
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typedef void difference_type;
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Derived& operator++();
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Derived operator++(int) const;
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};
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template<class Derived, class Value>
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struct traversal_archetype_<Derived, Value, single_pass_iterator_tag>
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: public equality_comparable< traversal_archetype_<Derived, Value, single_pass_iterator_tag> >,
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public traversal_archetype_<Derived, Value, incrementable_iterator_tag>
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{
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};
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template <class Derived, class Value>
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bool operator==(traversal_archetype_<Derived, Value, single_pass_iterator_tag> const&,
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traversal_archetype_<Derived, Value, single_pass_iterator_tag> const&);
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template<class Derived, class Value>
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struct traversal_archetype_<Derived, Value, forward_traversal_tag>
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: public traversal_archetype_<Derived, Value, single_pass_iterator_tag>
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{
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typedef std::ptrdiff_t difference_type;
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};
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template<class Derived, class Value>
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struct traversal_archetype_<Derived, Value, bidirectional_traversal_tag>
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: public traversal_archetype_<Derived, Value, forward_traversal_tag>
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{
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Derived& operator--();
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Derived operator--(int) const;
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};
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template<class Derived, class Value>
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struct traversal_archetype_<Derived, Value, random_access_traversal_tag>
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: public partially_ordered< traversal_archetype_<Derived, Value, random_access_traversal_tag> >,
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public traversal_archetype_<Derived, Value, bidirectional_traversal_tag>
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{
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Derived& operator+=(std::ptrdiff_t);
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Derived& operator-=(std::ptrdiff_t);
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};
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template <class Derived, class Value>
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Derived& operator+(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
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std::ptrdiff_t);
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template <class Derived, class Value>
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Derived& operator+(std::ptrdiff_t,
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traversal_archetype_<Derived, Value, random_access_traversal_tag> const&);
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template <class Derived, class Value>
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Derived& operator-(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
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std::ptrdiff_t);
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template <class Derived, class Value>
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std::ptrdiff_t operator-(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
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traversal_archetype_<Derived, Value, random_access_traversal_tag> const&);
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template <class Derived, class Value>
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bool operator<(traversal_archetype_<Derived, Value, random_access_traversal_tag> const&,
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traversal_archetype_<Derived, Value, random_access_traversal_tag> const&);
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struct bogus_type;
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template <class Value>
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struct convertible_type
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: mpl::if_< is_const<Value>,
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typename remove_const<Value>::type,
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bogus_type >
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{};
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} // namespace detail
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template <class Value, class AccessCategory>
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struct access_archetype;
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template <class Value>
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struct access_archetype<Value, readable_iterator_tag>
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{
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typedef typename remove_cv<Value>::type value_type;
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typedef Value reference;
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typedef Value* pointer;
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value_type operator*() const;
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detail::arrow_proxy<Value> operator->() const;
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};
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template <class Value>
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struct access_archetype<Value, writable_iterator_tag>
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{
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BOOST_STATIC_ASSERT((!is_const<Value>::value));
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typedef void value_type;
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typedef void reference;
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typedef void pointer;
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detail::assign_proxy<Value> operator*() const;
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};
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template <class Value>
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struct access_archetype<Value, readable_writable_iterator_tag> :
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public virtual access_archetype<Value, readable_iterator_tag>
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{
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typedef detail::read_write_proxy<Value> reference;
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detail::read_write_proxy<Value> operator*() const;
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};
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template <class Value>
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struct access_archetype<Value, readable_lvalue_iterator_tag> :
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public virtual access_archetype<Value, readable_iterator_tag>
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{
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typedef Value& reference;
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Value& operator*() const;
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Value* operator->() const;
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};
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template <class Value>
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struct access_archetype<Value, writable_lvalue_iterator_tag>
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: public virtual access_archetype<Value, readable_lvalue_iterator_tag>
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{
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BOOST_STATIC_ASSERT((!is_const<Value>::value));
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};
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template <class Derived, class Value, class AccessCategory, class TraversalCategory>
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struct traversal_archetype
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: detail::operator_brackets< typename remove_cv<Value>::type,
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AccessCategory,
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TraversalCategory >,
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detail::traversal_archetype_<Derived, Value, TraversalCategory>
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{
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};
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template <class Value, class AccessCategory, class TraversalCategory>
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struct iterator_archetype
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: public traversal_archetype<iterator_archetype<Value, AccessCategory, TraversalCategory>, Value, AccessCategory, TraversalCategory>,
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public access_archetype<Value, AccessCategory>
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{
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typedef iterator_tag<AccessCategory, TraversalCategory> iterator_category;
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iterator_archetype();
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iterator_archetype(iterator_archetype const&);
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iterator_archetype& operator=(iterator_archetype const&);
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// Optional conversion from mutable
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// iterator_archetype(iterator_archetype<typename detail::convertible_type<Value>::type, AccessCategory, TraversalCategory> const&);
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};
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} // namespace boost
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#endif // BOOST_ITERATOR_ARCHETYPES_HPP
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