--- /dev/null
+// Boost.Range library concept checks
+//
+// Copyright Neil Groves 2009. Use, modification and distribution
+// are subject to 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)
+//
+// Copyright Daniel Walker 2006. Use, modification and distribution
+// are subject to 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#ifndef BOOST_RANGE_CONCEPTS_HPP
+#define BOOST_RANGE_CONCEPTS_HPP
+
+#include <boost/concept_check.hpp>
+#include <boost/iterator/iterator_concepts.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/range/value_type.hpp>
+#include <boost/range/detail/misc_concept.hpp>
+
+/*!
+ * \file
+ * \brief Concept checks for the Boost Range library.
+ *
+ * The structures in this file may be used in conjunction with the
+ * Boost Concept Check library to insure that the type of a function
+ * parameter is compatible with a range concept. If not, a meaningful
+ * compile time error is generated. Checks are provided for the range
+ * concepts related to iterator traversal categories. For example, the
+ * following line checks that the type T models the ForwardRange
+ * concept.
+ *
+ * \code
+ * BOOST_CONCEPT_ASSERT((ForwardRangeConcept<T>));
+ * \endcode
+ *
+ * A different concept check is required to ensure writeable value
+ * access. For example to check for a ForwardRange that can be written
+ * to, the following code is required.
+ *
+ * \code
+ * BOOST_CONCEPT_ASSERT((WriteableForwardRangeConcept<T>));
+ * \endcode
+ *
+ * \see http://www.boost.org/libs/range/doc/range.html for details
+ * about range concepts.
+ * \see http://www.boost.org/libs/iterator/doc/iterator_concepts.html
+ * for details about iterator concepts.
+ * \see http://www.boost.org/libs/concept_check/concept_check.htm for
+ * details about concept checks.
+ */
+
+namespace boost {
+
+ namespace range_detail {
+
+#ifndef BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+
+// List broken compiler versions here:
+ #ifdef __GNUC__
+ // GNUC 4.2 has strange issues correctly detecting compliance with the Concepts
+ // hence the least disruptive approach is to turn-off the concept checking for
+ // this version of the compiler.
+ #if __GNUC__ == 4 && __GNUC_MINOR__ == 2
+ #define BOOST_RANGE_ENABLE_CONCEPT_ASSERT 0
+ #endif
+ #endif
+
+ #ifdef __BORLANDC__
+ #define BOOST_RANGE_ENABLE_CONCEPT_ASSERT 0
+ #endif
+
+ #ifdef __PATHCC__
+ #define BOOST_RANGE_ENABLE_CONCEPT_ASSERT 0
+ #endif
+
+// Default to using the concept asserts unless we have defined it off
+// during the search for black listed compilers.
+ #ifndef BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ #define BOOST_RANGE_ENABLE_CONCEPT_ASSERT 1
+ #endif
+
+#endif
+
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ #define BOOST_RANGE_CONCEPT_ASSERT( x ) BOOST_CONCEPT_ASSERT( x )
+#else
+ #define BOOST_RANGE_CONCEPT_ASSERT( x )
+#endif
+
+ // Rationale for the inclusion of redefined iterator concept
+ // classes:
+ //
+ // The Range algorithms often do not require that the iterators are
+ // Assignable or default constructable, but the correct standard
+ // conformant iterators do require the iterators to be a model of the
+ // Assignable concept.
+ // Iterators that contains a functor that is not assignable therefore
+ // are not correct models of the standard iterator concepts,
+ // despite being adequate for most algorithms. An example of this
+ // use case is the combination of the boost::adaptors::filtered
+ // class with a boost::lambda::bind generated functor.
+ // Ultimately modeling the range concepts using composition
+ // with the Boost.Iterator concepts would render the library
+ // incompatible with many common Boost.Lambda expressions.
+ template<class Iterator>
+ struct IncrementableIteratorConcept : CopyConstructible<Iterator>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ typedef BOOST_DEDUCED_TYPENAME iterator_traversal<Iterator>::type traversal_category;
+
+ BOOST_RANGE_CONCEPT_ASSERT((
+ Convertible<
+ traversal_category,
+ incrementable_traversal_tag
+ >));
+
+ BOOST_CONCEPT_USAGE(IncrementableIteratorConcept)
+ {
+ ++i;
+ (void)i++;
+ }
+ private:
+ Iterator i;
+#endif
+ };
+
+ template<class Iterator>
+ struct SinglePassIteratorConcept
+ : IncrementableIteratorConcept<Iterator>
+ , EqualityComparable<Iterator>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((
+ Convertible<
+ BOOST_DEDUCED_TYPENAME SinglePassIteratorConcept::traversal_category,
+ single_pass_traversal_tag
+ >));
+
+ BOOST_CONCEPT_USAGE(SinglePassIteratorConcept)
+ {
+ Iterator i2(++i);
+ boost::ignore_unused_variable_warning(i2);
+
+ // deliberately we are loose with the postfix version for the single pass
+ // iterator due to the commonly poor adherence to the specification means that
+ // many algorithms would be unusable, whereas actually without the check they
+ // work
+ (void)(i++);
+
+ BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::reference r1(*i);
+ boost::ignore_unused_variable_warning(r1);
+
+ BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::reference r2(*(++i));
+ boost::ignore_unused_variable_warning(r2);
+ }
+ private:
+ Iterator i;
+#endif
+ };
+
+ template<class Iterator>
+ struct ForwardIteratorConcept
+ : SinglePassIteratorConcept<Iterator>
+ , DefaultConstructible<Iterator>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ typedef BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::difference_type difference_type;
+
+ BOOST_MPL_ASSERT((is_integral<difference_type>));
+ BOOST_MPL_ASSERT_RELATION(std::numeric_limits<difference_type>::is_signed, ==, true);
+
+ BOOST_RANGE_CONCEPT_ASSERT((
+ Convertible<
+ BOOST_DEDUCED_TYPENAME ForwardIteratorConcept::traversal_category,
+ forward_traversal_tag
+ >));
+
+ BOOST_CONCEPT_USAGE(ForwardIteratorConcept)
+ {
+ // See the above note in the SinglePassIteratorConcept about the handling of the
+ // postfix increment. Since with forward and better iterators there is no need
+ // for a proxy, we can sensibly require that the dereference result
+ // is convertible to reference.
+ Iterator i2(i++);
+ boost::ignore_unused_variable_warning(i2);
+ BOOST_DEDUCED_TYPENAME boost::detail::iterator_traits<Iterator>::reference r(*(i++));
+ boost::ignore_unused_variable_warning(r);
+ }
+ private:
+ Iterator i;
+#endif
+ };
+
+ template<class Iterator>
+ struct BidirectionalIteratorConcept
+ : ForwardIteratorConcept<Iterator>
+ {
+ #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((
+ Convertible<
+ BOOST_DEDUCED_TYPENAME BidirectionalIteratorConcept::traversal_category,
+ bidirectional_traversal_tag
+ >));
+
+ BOOST_CONCEPT_USAGE(BidirectionalIteratorConcept)
+ {
+ --i;
+ (void)i--;
+ }
+ private:
+ Iterator i;
+ #endif
+ };
+
+ template<class Iterator>
+ struct RandomAccessIteratorConcept
+ : BidirectionalIteratorConcept<Iterator>
+ {
+ #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((
+ Convertible<
+ BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept::traversal_category,
+ random_access_traversal_tag
+ >));
+
+ BOOST_CONCEPT_USAGE(RandomAccessIteratorConcept)
+ {
+ i += n;
+ i = i + n;
+ i = n + i;
+ i -= n;
+ i = i - n;
+ n = i - j;
+ }
+ private:
+ BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept::difference_type n;
+ Iterator i;
+ Iterator j;
+ #endif
+ };
+
+ } // namespace range_detail
+
+ //! Check if a type T models the SinglePassRange range concept.
+ template<class T>
+ struct SinglePassRangeConcept
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ typedef BOOST_DEDUCED_TYPENAME range_iterator<T const>::type const_iterator;
+ typedef BOOST_DEDUCED_TYPENAME range_iterator<T>::type iterator;
+
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::SinglePassIteratorConcept<iterator>));
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::SinglePassIteratorConcept<const_iterator>));
+
+ BOOST_CONCEPT_USAGE(SinglePassRangeConcept)
+ {
+ // This has been modified from assigning to this->i
+ // (where i was a member variable) to improve
+ // compatibility with Boost.Lambda
+ iterator i1 = boost::begin(*m_range);
+ iterator i2 = boost::end(*m_range);
+
+ ignore_unused_variable_warning(i1);
+ ignore_unused_variable_warning(i2);
+
+ const_constraints(*m_range);
+ }
+
+ private:
+ void const_constraints(const T& const_range)
+ {
+ const_iterator ci1 = boost::begin(const_range);
+ const_iterator ci2 = boost::end(const_range);
+
+ ignore_unused_variable_warning(ci1);
+ ignore_unused_variable_warning(ci2);
+ }
+
+ // Rationale:
+ // The type of m_range is T* rather than T because it allows
+ // T to be an abstract class. The other obvious alternative of
+ // T& produces a warning on some compilers.
+ T* m_range;
+#endif
+ };
+
+ //! Check if a type T models the ForwardRange range concept.
+ template<class T>
+ struct ForwardRangeConcept : SinglePassRangeConcept<T>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::ForwardIteratorConcept<BOOST_DEDUCED_TYPENAME ForwardRangeConcept::iterator>));
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::ForwardIteratorConcept<BOOST_DEDUCED_TYPENAME ForwardRangeConcept::const_iterator>));
+#endif
+ };
+
+ template<class Range>
+ struct WriteableRangeConcept
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ typedef BOOST_DEDUCED_TYPENAME range_iterator<Range>::type iterator;
+
+ BOOST_CONCEPT_USAGE(WriteableRangeConcept)
+ {
+ *i = v;
+ }
+ private:
+ iterator i;
+ BOOST_DEDUCED_TYPENAME range_value<Range>::type v;
+#endif
+ };
+
+ //! Check if a type T models the WriteableForwardRange range concept.
+ template<class T>
+ struct WriteableForwardRangeConcept
+ : ForwardRangeConcept<T>
+ , WriteableRangeConcept<T>
+ {
+ };
+
+ //! Check if a type T models the BidirectionalRange range concept.
+ template<class T>
+ struct BidirectionalRangeConcept : ForwardRangeConcept<T>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::iterator>));
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::BidirectionalIteratorConcept<BOOST_DEDUCED_TYPENAME BidirectionalRangeConcept::const_iterator>));
+#endif
+ };
+
+ //! Check if a type T models the WriteableBidirectionalRange range concept.
+ template<class T>
+ struct WriteableBidirectionalRangeConcept
+ : BidirectionalRangeConcept<T>
+ , WriteableRangeConcept<T>
+ {
+ };
+
+ //! Check if a type T models the RandomAccessRange range concept.
+ template<class T>
+ struct RandomAccessRangeConcept : BidirectionalRangeConcept<T>
+ {
+#if BOOST_RANGE_ENABLE_CONCEPT_ASSERT
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::iterator>));
+ BOOST_RANGE_CONCEPT_ASSERT((range_detail::RandomAccessIteratorConcept<BOOST_DEDUCED_TYPENAME RandomAccessRangeConcept::const_iterator>));
+#endif
+ };
+
+ //! Check if a type T models the WriteableRandomAccessRange range concept.
+ template<class T>
+ struct WriteableRandomAccessRangeConcept
+ : RandomAccessRangeConcept<T>
+ , WriteableRangeConcept<T>
+ {
+ };
+
+} // namespace boost
+
+#endif // BOOST_RANGE_CONCEPTS_HPP
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