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+// Boost token_iterator.hpp -------------------------------------------------//
+
+// Copyright John R. Bandela 2001
+// 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)
+
+// See http://www.boost.org/libs/tokenizer for documentation.
+
+// Revision History:
+// 16 Jul 2003 John Bandela
+// Allowed conversions from convertible base iterators
+// 03 Jul 2003 John Bandela
+// Converted to new iterator adapter
+
+
+
+#ifndef BOOST_TOKENIZER_POLICY_JRB070303_HPP_
+#define BOOST_TOKENIZER_POLICY_JRB070303_HPP_
+
+#include<boost/assert.hpp>
+#include<boost/iterator/iterator_adaptor.hpp>
+#include<boost/iterator/detail/minimum_category.hpp>
+#include<boost/token_functions.hpp>
+#include<utility>
+
+namespace boost
+{
+ template <class TokenizerFunc, class Iterator, class Type>
+ class token_iterator
+ : public iterator_facade<
+ token_iterator<TokenizerFunc, Iterator, Type>
+ , Type
+ , typename detail::minimum_category<
+ forward_traversal_tag
+ , typename iterator_traversal<Iterator>::type
+ >::type
+ , const Type&
+ >
+ {
+
+ friend class iterator_core_access;
+
+ TokenizerFunc f_;
+ Iterator begin_;
+ Iterator end_;
+ bool valid_;
+ Type tok_;
+
+ void increment(){
+ BOOST_ASSERT(valid_);
+ valid_ = f_(begin_,end_,tok_);
+ }
+
+ const Type& dereference() const {
+ BOOST_ASSERT(valid_);
+ return tok_;
+ }
+ template<class Other>
+ bool equal(const Other& a) const{
+ return (a.valid_ && valid_)
+ ?( (a.begin_==begin_) && (a.end_ == end_) )
+ :(a.valid_==valid_);
+
+ }
+
+ void initialize(){
+ if(valid_) return;
+ f_.reset();
+ valid_ = (begin_ != end_)?
+ f_(begin_,end_,tok_):false;
+ }
+ public:
+ token_iterator():begin_(),end_(),valid_(false),tok_() { }
+
+ token_iterator(TokenizerFunc f, Iterator begin, Iterator e = Iterator())
+ : f_(f),begin_(begin),end_(e),valid_(false),tok_(){ initialize(); }
+
+ token_iterator(Iterator begin, Iterator e = Iterator())
+ : f_(),begin_(begin),end_(e),valid_(false),tok_() {initialize();}
+
+ template<class OtherIter>
+ token_iterator(
+ token_iterator<TokenizerFunc, OtherIter,Type> const& t
+ , typename enable_if_convertible<OtherIter, Iterator>::type* = 0)
+ : f_(t.tokenizer_function()),begin_(t.base())
+ ,end_(t.end()),valid_(!t.at_end()),tok_(t.current_token()) {}
+
+ Iterator base()const{return begin_;}
+
+ Iterator end()const{return end_;};
+
+ TokenizerFunc tokenizer_function()const{return f_;}
+
+ Type current_token()const{return tok_;}
+
+ bool at_end()const{return !valid_;}
+
+
+
+
+ };
+ template <
+ class TokenizerFunc = char_delimiters_separator<char>,
+ class Iterator = std::string::const_iterator,
+ class Type = std::string
+ >
+ class token_iterator_generator {
+
+ private:
+ public:
+ typedef token_iterator<TokenizerFunc,Iterator,Type> type;
+ };
+
+
+ // Type has to be first because it needs to be explicitly specified
+ // because there is no way the function can deduce it.
+ template<class Type, class Iterator, class TokenizerFunc>
+ typename token_iterator_generator<TokenizerFunc,Iterator,Type>::type
+ make_token_iterator(Iterator begin, Iterator end,const TokenizerFunc& fun){
+ typedef typename
+ token_iterator_generator<TokenizerFunc,Iterator,Type>::type ret_type;
+ return ret_type(fun,begin,end);
+ }
+
+} // namespace boost
+
+#endif