comparison DEPENDENCIES/generic/include/boost/wave/util/unput_queue_iterator.hpp @ 16:2665513ce2d3

Add boost headers

+/*=============================================================================
+    Boost.Wave: A Standard compliant C++ preprocessor library
+
+    Definition of the unput queue iterator
+    
+    http://www.boost.org/
+
+    Copyright (c) 2001-2012 Hartmut Kaiser. 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)
+=============================================================================*/
+#if !defined(UNPUT_QUEUE_ITERATOR_HPP_76DA23D0_4893_4AD5_ABCC_6CED7CFB89BC_INCLUDED)
+#define UNPUT_QUEUE_ITERATOR_HPP_76DA23D0_4893_4AD5_ABCC_6CED7CFB89BC_INCLUDED
+
+#include <list>
+
+#include <boost/assert.hpp>
+#include <boost/iterator_adaptors.hpp>
+
+#include <boost/wave/wave_config.hpp>
+#include <boost/wave/token_ids.hpp>     // token_id 
+
+// this must occur after all of the includes and before any code appears
+#ifdef BOOST_HAS_ABI_HEADERS
+#include BOOST_ABI_PREFIX
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost {
+namespace wave {
+namespace util {
+
+///////////////////////////////////////////////////////////////////////////////
+//
+//  unput_queue_iterator
+//
+//      The unput_queue_iterator templates encapsulates an unput_queue together
+//      with the direct input to be read after the unput queue is emptied
+//
+//      This version is for the new iterator_adaptors (was released with
+//      Boost V1.31.0)
+//
+///////////////////////////////////////////////////////////////////////////////
+template <typename IteratorT, typename TokenT, typename ContainerT>
+class unput_queue_iterator 
+:   public boost::iterator_adaptor<
+        unput_queue_iterator<IteratorT, TokenT, ContainerT>, 
+            IteratorT, TokenT const, std::forward_iterator_tag>
+{
+    typedef boost::iterator_adaptor<
+                unput_queue_iterator<IteratorT, TokenT, ContainerT>, 
+                IteratorT, TokenT const, std::forward_iterator_tag>
+        base_type;
+
+public:
+    typedef ContainerT  container_type;
+    typedef IteratorT   iterator_type;
+
+    unput_queue_iterator(IteratorT const &it, ContainerT &queue)
+    :   base_type(it), unput_queue(queue)
+    {}
+    
+    ContainerT &get_unput_queue() 
+        { return unput_queue; }
+    ContainerT const &get_unput_queue() const 
+        { return unput_queue; }
+    IteratorT &get_base_iterator() 
+        { return base_type::base_reference(); }
+    IteratorT const &get_base_iterator() const 
+        { return base_type::base_reference(); }
+    
+    unput_queue_iterator &operator= (unput_queue_iterator const &rhs)
+    { 
+        if (this != &rhs) {
+            unput_queue = rhs.unput_queue; 
+            base_type::operator=(rhs);
+        }
+        return *this; 
+    }
+
+    typename base_type::reference dereference() const
+    {
+        if (!unput_queue.empty())
+            return unput_queue.front();
+        return *base_type::base_reference(); 
+    }
+
+    void increment()
+    { 
+        if (!unput_queue.empty()) {
+        // there exist pending tokens in the unput queue
+            unput_queue.pop_front();
+        }
+        else {
+        // the unput_queue is empty, so advance the base iterator
+            ++base_type::base_reference(); 
+        }
+    }
+
+    template <
+        typename OtherDerivedT, typename OtherIteratorT, 
+        typename V, typename C, typename R, typename D
+    >   
+    bool equal(
+        boost::iterator_adaptor<OtherDerivedT, OtherIteratorT, V, C, R, D> 
+        const &x) const
+    {
+    // two iterators are equal, if both begin() iterators of the queue 
+    // objects are equal and the base iterators are equal as well
+        OtherDerivedT const &rhs = static_cast<OtherDerivedT const &>(x);
+        return 
+            ((unput_queue.empty() && rhs.unput_queue.empty()) ||
+              (&unput_queue == &rhs.unput_queue &&
+               unput_queue.begin() == rhs.unput_queue.begin()
+              )
+            ) &&
+            (get_base_iterator() == rhs.get_base_iterator()); 
+    }
+
+private:
+    ContainerT &unput_queue;
+};
+
+namespace impl {
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename IteratorT, typename TokenT, typename ContainerT>
+    struct gen_unput_queue_iterator 
+    {
+        typedef ContainerT  container_type;
+        typedef IteratorT iterator_type;
+        typedef unput_queue_iterator<IteratorT, TokenT, ContainerT> 
+            return_type;
+
+        static container_type last;
+
+        static return_type
+        generate(iterator_type const &it)
+        {
+            return return_type(it, last);
+        }
+
+        static return_type
+        generate(ContainerT &queue, iterator_type const &it)
+        {
+            return return_type(it, queue);
+        }
+    };
+
+    template <typename IteratorT, typename TokenT, typename ContainerT>
+    typename gen_unput_queue_iterator<IteratorT, TokenT, ContainerT>::
+          container_type  
+        gen_unput_queue_iterator<IteratorT, TokenT, ContainerT>::last = 
+            typename gen_unput_queue_iterator<IteratorT, TokenT, ContainerT>::
+                  container_type();
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename IteratorT, typename TokenT, typename ContainerT>
+    struct gen_unput_queue_iterator<
+        unput_queue_iterator<IteratorT, TokenT, ContainerT>, 
+            TokenT, ContainerT> 
+    {
+        typedef ContainerT  container_type;
+        typedef unput_queue_iterator<IteratorT, TokenT, ContainerT> 
+            iterator_type;
+        typedef unput_queue_iterator<IteratorT, TokenT, ContainerT> 
+            return_type;
+
+        static container_type last;
+
+        static return_type 
+        generate(iterator_type &it)
+        {
+            return return_type(it.base(), last);
+        }
+
+        static return_type 
+        generate(ContainerT &queue, iterator_type &it)
+        {
+            return return_type(it.base(), queue);
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename IteratorT>
+    struct assign_iterator 
+    {
+        static void 
+        do_ (IteratorT &dest, IteratorT const &src)
+        {
+            dest = src;
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    //
+    // Look for the first non-whitespace token and return this token id.
+    // Note though, that the embedded unput_queues are not touched in any way!
+    //
+    template <typename IteratorT>
+    struct next_token 
+    {
+        static boost::wave::token_id  
+        peek(IteratorT it, IteratorT end, bool skip_whitespace = true)
+        {
+            using namespace boost::wave;
+            if (skip_whitespace) {
+                for (++it; it != end; ++it) {
+                    if (!IS_CATEGORY(*it, WhiteSpaceTokenType) &&
+                        T_NEWLINE != token_id(*it))
+                    {
+                        break;  // stop at the first non-whitespace token
+                    }
+                }
+            }
+            else {
+                ++it;           // we have at least to look ahead
+            }
+            if (it != end) 
+                return token_id(*it);
+            return T_EOI;
+        }
+    };
+
+    template <typename IteratorT, typename TokenT, typename ContainerT>
+    struct next_token<
+        unput_queue_iterator<IteratorT, TokenT, ContainerT> > {
+
+        typedef unput_queue_iterator<IteratorT, TokenT, ContainerT> iterator_type;
+
+        static boost::wave::token_id 
+        peek(iterator_type it, iterator_type end, bool skip_whitespace = true)
+        {
+            using namespace boost::wave;
+
+        typename iterator_type::container_type &queue = it.get_unput_queue();
+
+        // first try to find it in the unput_queue
+            if (0 != queue.size()) {
+            typename iterator_type::container_type::iterator cit = queue.begin();
+            typename iterator_type::container_type::iterator cend = queue.end();
+
+                if (skip_whitespace) {
+                    for (++cit; cit != cend; ++cit) {
+                        if (!IS_CATEGORY(*cit, WhiteSpaceTokenType) &&
+                            T_NEWLINE != token_id(*cit))
+                        {
+                            break;  // stop at the first non-whitespace token
+                        }
+                    }
+                }
+                else {
+                    ++cit;          // we have at least to look ahead
+                }
+                if (cit != cend) 
+                    return token_id(*cit);
+            }
+
+        // second try to move on into the base iterator stream
+        typename iterator_type::iterator_type base_it = it.get_base_iterator();
+        typename iterator_type::iterator_type base_end = end.get_base_iterator();
+
+            if (0 == queue.size())
+                ++base_it;  // advance, if the unput queue is empty
+
+            if (skip_whitespace) {
+                for (/**/; base_it != base_end; ++base_it) {
+                    if (!IS_CATEGORY(*base_it, WhiteSpaceTokenType) &&
+                        T_NEWLINE != token_id(*base_it))
+                    {
+                        break;  // stop at the first non-whitespace token
+                    }
+                }
+            }
+            if (base_it == base_end)
+                return T_EOI;
+
+            return token_id(*base_it);
+        }
+    };
+
+///////////////////////////////////////////////////////////////////////////////
+}   // namespace impl
+
+///////////////////////////////////////////////////////////////////////////////
+}   // namespace util
+}   // namespace wave
+}   // namespace boost
+
+// the suffix header occurs after all of the code
+#ifdef BOOST_HAS_ABI_HEADERS
+#include BOOST_ABI_SUFFIX
+#endif
+
+#endif // !defined(UNPUT_QUEUE_ITERATOR_HPP_76DA23D0_4893_4AD5_ABCC_6CED7CFB89BC_INCLUDED)