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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/detail/iterator.hpp
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+// (C) Copyright David Abrahams 2002.
+// 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)
+
+// Boost versions of
+//
+// std::iterator_traits<>::iterator_category
+// std::iterator_traits<>::difference_type
+// std::distance()
+//
+// ...for all compilers and iterators
+//
+// Additionally, if X is a pointer
+// std::iterator_traits<X>::pointer
+
+// Otherwise, if partial specialization is supported or X is not a pointer
+// std::iterator_traits<X>::value_type
+// std::iterator_traits<X>::pointer
+// std::iterator_traits<X>::reference
+//
+// See http://www.boost.org for most recent version including documentation.
+
+// Revision History
+// 04 Mar 2001 - More attempted fixes for Intel C++ (David Abrahams)
+// 03 Mar 2001 - Put all implementation into namespace
+// boost::detail::iterator_traits_. Some progress made on fixes
+// for Intel compiler. (David Abrahams)
+// 02 Mar 2001 - Changed BOOST_MSVC to BOOST_MSVC_STD_ITERATOR in a few
+// places. (Jeremy Siek)
+// 19 Feb 2001 - Improved workarounds for stock MSVC6; use yes_type and
+// no_type from type_traits.hpp; stopped trying to remove_cv
+// before detecting is_pointer, in honor of the new type_traits
+// semantics. (David Abrahams)
+// 13 Feb 2001 - Make it work with nearly all standard-conforming iterators
+// under raw VC6. The one category remaining which will fail is
+// that of iterators derived from std::iterator but not
+// boost::iterator and which redefine difference_type.
+// 11 Feb 2001 - Clean away code which can never be used (David Abrahams)
+// 09 Feb 2001 - Always have a definition for each traits member, even if it
+// can't be properly deduced. These will be incomplete types in
+// some cases (undefined<void>), but it helps suppress MSVC errors
+// elsewhere (David Abrahams)
+// 07 Feb 2001 - Support for more of the traits members where possible, making
+// this useful as a replacement for std::iterator_traits<T> when
+// used as a default template parameter.
+// 06 Feb 2001 - Removed useless #includes of standard library headers
+// (David Abrahams)
+
+#ifndef ITERATOR_DWA122600_HPP_
+# define ITERATOR_DWA122600_HPP_
+
+# include <boost/config.hpp>
+# include <iterator>
+
+// STLPort 4.0 and betas have a bug when debugging is enabled and there is no
+// partial specialization: instead of an iterator_category typedef, the standard
+// container iterators have _Iterator_category.
+//
+// Also, whether debugging is enabled or not, there is a broken specialization
+// of std::iterator<output_iterator_tag,void,void,void,void> which has no
+// typedefs but iterator_category.
+# if defined(__SGI_STL_PORT)
+
+# if (__SGI_STL_PORT <= 0x410) && !defined(__STL_CLASS_PARTIAL_SPECIALIZATION) && defined(__STL_DEBUG)
+# define BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+# endif
+
+# define BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+
+# endif // STLPort <= 4.1b4 && no partial specialization
+
+# if !defined(BOOST_NO_STD_ITERATOR_TRAITS) \
+ && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+ && !defined(BOOST_MSVC_STD_ITERATOR)
+
+namespace boost { namespace detail {
+
+// Define a new template so it can be specialized
+template <class Iterator>
+struct iterator_traits
+ : std::iterator_traits<Iterator>
+{};
+using std::distance;
+
+}} // namespace boost::detail
+
+# else
+
+# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+ && !defined(BOOST_MSVC_STD_ITERATOR)
+
+// This is the case where everything conforms except BOOST_NO_STD_ITERATOR_TRAITS
+
+namespace boost { namespace detail {
+
+// Rogue Wave Standard Library fools itself into thinking partial
+// specialization is missing on some platforms (e.g. Sun), so fails to
+// supply iterator_traits!
+template <class Iterator>
+struct iterator_traits
+{
+ typedef typename Iterator::value_type value_type;
+ typedef typename Iterator::reference reference;
+ typedef typename Iterator::pointer pointer;
+ typedef typename Iterator::difference_type difference_type;
+ typedef typename Iterator::iterator_category iterator_category;
+};
+
+template <class T>
+struct iterator_traits<T*>
+{
+ typedef T value_type;
+ typedef T& reference;
+ typedef T* pointer;
+ typedef std::ptrdiff_t difference_type;
+ typedef std::random_access_iterator_tag iterator_category;
+};
+
+template <class T>
+struct iterator_traits<T const*>
+{
+ typedef T value_type;
+ typedef T const& reference;
+ typedef T const* pointer;
+ typedef std::ptrdiff_t difference_type;
+ typedef std::random_access_iterator_tag iterator_category;
+};
+
+}} // namespace boost::detail
+
+# else
+
+# include <boost/type_traits/remove_const.hpp>
+# include <boost/type_traits/detail/yes_no_type.hpp>
+# include <boost/type_traits/is_pointer.hpp>
+
+# ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+# include <boost/type_traits/is_same.hpp>
+# include <boost/type_traits/remove_pointer.hpp>
+# endif
+# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+# include <boost/type_traits/is_base_and_derived.hpp>
+# endif
+
+# include <boost/mpl/if.hpp>
+# include <boost/mpl/has_xxx.hpp>
+# include <cstddef>
+
+// should be the last #include
+# include "boost/type_traits/detail/bool_trait_def.hpp"
+
+namespace boost { namespace detail {
+
+BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(reference)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(pointer)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(difference_type)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(iterator_category)
+
+// is_mutable_iterator --
+//
+// A metafunction returning true iff T is a mutable iterator type
+// with a nested value_type. Will only work portably with iterators
+// whose operator* returns a reference, but that seems to be OK for
+// the iterators supplied by Dinkumware. Some input iterators may
+// compile-time if they arrive here, and if the compiler is strict
+// about not taking the address of an rvalue.
+
+// This one detects ordinary mutable iterators - the result of
+// operator* is convertible to the value_type.
+template <class T>
+type_traits::yes_type is_mutable_iterator_helper(T const*, BOOST_DEDUCED_TYPENAME T::value_type*);
+
+// Since you can't take the address of an rvalue, the guts of
+// is_mutable_iterator_impl will fail if we use &*t directly. This
+// makes sure we can still work with non-lvalue iterators.
+template <class T> T* mutable_iterator_lvalue_helper(T& x);
+int mutable_iterator_lvalue_helper(...);
+
+
+// This one detects output iterators such as ostream_iterator which
+// return references to themselves.
+template <class T>
+type_traits::yes_type is_mutable_iterator_helper(T const*, T const*);
+
+type_traits::no_type is_mutable_iterator_helper(...);
+
+template <class T>
+struct is_mutable_iterator_impl
+{
+ static T t;
+
+ BOOST_STATIC_CONSTANT(
+ bool, value = sizeof(
+ detail::is_mutable_iterator_helper(
+ (T*)0
+ , mutable_iterator_lvalue_helper(*t) // like &*t
+ ))
+ == sizeof(type_traits::yes_type)
+ );
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+ is_mutable_iterator,T,::boost::detail::is_mutable_iterator_impl<T>::value)
+
+
+// is_full_iterator_traits --
+//
+// A metafunction returning true iff T has all the requisite nested
+// types to satisfy the requirements for a fully-conforming
+// iterator_traits implementation.
+template <class T>
+struct is_full_iterator_traits_impl
+{
+ enum { value =
+ has_value_type<T>::value
+ & has_reference<T>::value
+ & has_pointer<T>::value
+ & has_difference_type<T>::value
+ & has_iterator_category<T>::value
+ };
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+ is_full_iterator_traits,T,::boost::detail::is_full_iterator_traits_impl<T>::value)
+
+
+# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+BOOST_MPL_HAS_XXX_TRAIT_DEF(_Iterator_category)
+
+// is_stlport_40_debug_iterator --
+//
+// A metafunction returning true iff T has all the requisite nested
+// types to satisfy the requirements of an STLPort 4.0 debug iterator
+// iterator_traits implementation.
+template <class T>
+struct is_stlport_40_debug_iterator_impl
+{
+ enum { value =
+ has_value_type<T>::value
+ & has_reference<T>::value
+ & has_pointer<T>::value
+ & has_difference_type<T>::value
+ & has__Iterator_category<T>::value
+ };
+};
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(
+ is_stlport_40_debug_iterator,T,::boost::detail::is_stlport_40_debug_iterator_impl<T>::value)
+
+template <class T>
+struct stlport_40_debug_iterator_traits
+{
+ typedef typename T::value_type value_type;
+ typedef typename T::reference reference;
+ typedef typename T::pointer pointer;
+ typedef typename T::difference_type difference_type;
+ typedef typename T::_Iterator_category iterator_category;
+};
+# endif // BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+
+template <class T> struct pointer_iterator_traits;
+
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+template <class T>
+struct pointer_iterator_traits<T*>
+{
+ typedef typename remove_const<T>::type value_type;
+ typedef T* pointer;
+ typedef T& reference;
+ typedef std::random_access_iterator_tag iterator_category;
+ typedef std::ptrdiff_t difference_type;
+};
+# else
+
+// In case of no template partial specialization, and if T is a
+// pointer, iterator_traits<T>::value_type can still be computed. For
+// some basic types, remove_pointer is manually defined in
+// type_traits/broken_compiler_spec.hpp. For others, do it yourself.
+
+template<class P> class please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee;
+
+template<class P>
+struct pointer_value_type
+ : mpl::if_<
+ is_same<P, typename remove_pointer<P>::type>
+ , please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P>
+ , typename remove_const<
+ typename remove_pointer<P>::type
+ >::type
+ >
+{
+};
+
+
+template<class P>
+struct pointer_reference
+ : mpl::if_<
+ is_same<P, typename remove_pointer<P>::type>
+ , please_invoke_BOOST_TT_BROKEN_COMPILER_SPEC_on_cv_unqualified_pointee<P>
+ , typename remove_pointer<P>::type&
+ >
+{
+};
+
+template <class T>
+struct pointer_iterator_traits
+{
+ typedef T pointer;
+ typedef std::random_access_iterator_tag iterator_category;
+ typedef std::ptrdiff_t difference_type;
+
+ typedef typename pointer_value_type<T>::type value_type;
+ typedef typename pointer_reference<T>::type reference;
+};
+
+# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+// We'll sort iterator types into one of these classifications, from which we
+// can determine the difference_type, pointer, reference, and value_type
+template <class Iterator>
+struct standard_iterator_traits
+{
+ typedef typename Iterator::difference_type difference_type;
+ typedef typename Iterator::value_type value_type;
+ typedef typename Iterator::pointer pointer;
+ typedef typename Iterator::reference reference;
+ typedef typename Iterator::iterator_category iterator_category;
+};
+
+template <class Iterator>
+struct msvc_stdlib_mutable_traits
+ : std::iterator_traits<Iterator>
+{
+ typedef typename std::iterator_traits<Iterator>::distance_type difference_type;
+ typedef typename std::iterator_traits<Iterator>::value_type* pointer;
+ typedef typename std::iterator_traits<Iterator>::value_type& reference;
+};
+
+template <class Iterator>
+struct msvc_stdlib_const_traits
+ : std::iterator_traits<Iterator>
+{
+ typedef typename std::iterator_traits<Iterator>::distance_type difference_type;
+ typedef const typename std::iterator_traits<Iterator>::value_type* pointer;
+ typedef const typename std::iterator_traits<Iterator>::value_type& reference;
+};
+
+# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+template <class Iterator>
+struct is_bad_output_iterator
+ : is_base_and_derived<
+ std::iterator<std::output_iterator_tag,void,void,void,void>
+ , Iterator>
+{
+};
+
+struct bad_output_iterator_traits
+{
+ typedef void value_type;
+ typedef void difference_type;
+ typedef std::output_iterator_tag iterator_category;
+ typedef void pointer;
+ typedef void reference;
+};
+# endif
+
+// If we're looking at an MSVC6 (old Dinkumware) ``standard''
+// iterator, this will generate an appropriate traits class.
+template <class Iterator>
+struct msvc_stdlib_iterator_traits
+ : mpl::if_<
+ is_mutable_iterator<Iterator>
+ , msvc_stdlib_mutable_traits<Iterator>
+ , msvc_stdlib_const_traits<Iterator>
+ >::type
+{};
+
+template <class Iterator>
+struct non_pointer_iterator_traits
+ : mpl::if_<
+ // if the iterator contains all the right nested types...
+ is_full_iterator_traits<Iterator>
+ // Use a standard iterator_traits implementation
+ , standard_iterator_traits<Iterator>
+# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+ // Check for STLPort 4.0 broken _Iterator_category type
+ , mpl::if_<
+ is_stlport_40_debug_iterator<Iterator>
+ , stlport_40_debug_iterator_traits<Iterator>
+# endif
+ // Otherwise, assume it's a Dinkum iterator
+ , msvc_stdlib_iterator_traits<Iterator>
+# ifdef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+ >::type
+# endif
+ >::type
+{
+};
+
+template <class Iterator>
+struct iterator_traits_aux
+ : mpl::if_<
+ is_pointer<Iterator>
+ , pointer_iterator_traits<Iterator>
+ , non_pointer_iterator_traits<Iterator>
+ >::type
+{
+};
+
+template <class Iterator>
+struct iterator_traits
+{
+ // Explicit forwarding from base class needed to keep MSVC6 happy
+ // under some circumstances.
+ private:
+# ifdef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+ typedef
+ typename mpl::if_<
+ is_bad_output_iterator<Iterator>
+ , bad_output_iterator_traits
+ , iterator_traits_aux<Iterator>
+ >::type base;
+# else
+ typedef iterator_traits_aux<Iterator> base;
+# endif
+ public:
+ typedef typename base::value_type value_type;
+ typedef typename base::pointer pointer;
+ typedef typename base::reference reference;
+ typedef typename base::difference_type difference_type;
+ typedef typename base::iterator_category iterator_category;
+};
+
+// This specialization cuts off ETI (Early Template Instantiation) for MSVC.
+template <> struct iterator_traits<int>
+{
+ typedef int value_type;
+ typedef int pointer;
+ typedef int reference;
+ typedef int difference_type;
+ typedef int iterator_category;
+};
+
+}} // namespace boost::detail
+
+# endif // workarounds
+
+namespace boost { namespace detail {
+
+namespace iterator_traits_
+{
+ template <class Iterator, class Difference>
+ struct distance_select
+ {
+ static Difference execute(Iterator i1, const Iterator i2, ...)
+ {
+ Difference result = 0;
+ while (i1 != i2)
+ {
+ ++i1;
+ ++result;
+ }
+ return result;
+ }
+
+ static Difference execute(Iterator i1, const Iterator i2, std::random_access_iterator_tag*)
+ {
+ return i2 - i1;
+ }
+ };
+} // namespace boost::detail::iterator_traits_
+
+template <class Iterator>
+inline typename iterator_traits<Iterator>::difference_type
+distance(Iterator first, Iterator last)
+{
+ typedef typename iterator_traits<Iterator>::difference_type diff_t;
+ typedef typename ::boost::detail::iterator_traits<Iterator>::iterator_category iterator_category;
+
+ return iterator_traits_::distance_select<Iterator,diff_t>::execute(
+ first, last, (iterator_category*)0);
+}
+
+}}
+
+# endif
+
+
+# undef BOOST_BAD_CONTAINER_ITERATOR_CATEGORY_TYPEDEF
+# undef BOOST_BAD_OUTPUT_ITERATOR_SPECIALIZATION
+
+#endif // ITERATOR_DWA122600_HPP_