Chris@16: /*=============================================================================
Chris@16:     Boost.Wave: A Standard compliant C++ preprocessor library
Chris@16: 
Chris@16:     http://www.boost.org/
Chris@16: 
Chris@16:     Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
Chris@16:     Software License, Version 1.0. (See accompanying file
Chris@16:     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: =============================================================================*/
Chris@16: 
Chris@16: #if !defined(TRANSFORM_ITERATOR_HPP_D492C659_88C7_4258_8C42_192F9AE80EC0_INCLUDED)
Chris@16: #define TRANSFORM_ITERATOR_HPP_D492C659_88C7_4258_8C42_192F9AE80EC0_INCLUDED
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/iterator_adaptors.hpp>
Chris@16: #include <boost/iterator/transform_iterator.hpp>
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: 
Chris@16: // this must occur after all of the includes and before any code appears
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #include BOOST_ABI_PREFIX
Chris@16: #endif
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost {
Chris@16: namespace wave { 
Chris@16: namespace impl {
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: //  The new Boost.Iterator library already conatins a transform_iterator usable 
Chris@16: //  for our needs. The code below wraps this up.
Chris@16: //
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16:     template <class AdaptableUnaryFunctionT, class IteratorT>
Chris@16:     class ref_transform_iterator_generator
Chris@16:     {
Chris@16:         typedef typename AdaptableUnaryFunctionT::result_type   return_type;
Chris@16:         typedef typename AdaptableUnaryFunctionT::argument_type argument_type;
Chris@16: 
Chris@16:     public:
Chris@16:         typedef boost::transform_iterator<
Chris@16:                 return_type (*)(argument_type), IteratorT, return_type>
Chris@16:             type;
Chris@16:     };
Chris@16: 
Chris@16:     template <class AdaptableUnaryFunctionT, class IteratorT>
Chris@16:     inline 
Chris@16:     typename ref_transform_iterator_generator<
Chris@16:         AdaptableUnaryFunctionT, IteratorT>::type
Chris@16:     make_ref_transform_iterator(
Chris@16:         IteratorT base, AdaptableUnaryFunctionT const &f)
Chris@16:     {
Chris@16:         typedef typename ref_transform_iterator_generator<
Chris@16:                 AdaptableUnaryFunctionT, IteratorT>::type
Chris@16:             iterator_type;
Chris@16:         return iterator_type(base, f.transform);
Chris@16:     }
Chris@16: 
Chris@16:     //  Retrieve the token value given a parse node
Chris@16:     //  This is used in conjunction with the ref_transform_iterator above, to
Chris@16:     //  get the token values while iterating directly over the parse tree.
Chris@16:     template <typename TokenT, typename ParseTreeNodeT>
Chris@16:     struct get_token_value {
Chris@16: 
Chris@16:         typedef TokenT const &result_type;
Chris@16:         typedef ParseTreeNodeT const &argument_type;
Chris@16: 
Chris@16:         static result_type
Chris@16:         transform (argument_type node) 
Chris@16:         {
Chris@16:             BOOST_ASSERT(1 == std::distance(node.value.begin(), 
Chris@16:                 node.value.end()));
Chris@16:             return *node.value.begin();
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: }   // namespace impl
Chris@16: }   // namespace wave
Chris@16: }   // namespace boost
Chris@16: 
Chris@16: // the suffix header occurs after all of the code
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #include BOOST_ABI_SUFFIX
Chris@16: #endif
Chris@16: 
Chris@16: #endif // !defined(TRANSFORM_ITERATOR_HPP_D492C659_88C7_4258_8C42_192F9AE80EC0_INCLUDED)