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- // Copyright (c) 2001-2010 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)
- #include <iostream>
- #include <fstream>
- #include <vector>
- #include <boost/spirit/include/qi.hpp>
- #include <boost/spirit/include/support_multi_pass.hpp>
- ///////////////////////////////////////////////////////////////////////////////
- ///////////////////////////////////////////////////////////////////////////////
- //[tutorial_multi_pass
- int main()
- {
- namespace spirit = boost::spirit;
- using spirit::ascii::space;
- using spirit::ascii::char_;
- using spirit::qi::double_;
- using spirit::qi::eol;
- std::ifstream in("multi_pass.txt"); // we get our input from this file
- if (!in.is_open()) {
- std::cout << "Could not open input file: 'multi_pass.txt'" << std::endl;
- return -1;
- }
- typedef std::istreambuf_iterator<char> base_iterator_type;
- spirit::multi_pass<base_iterator_type> first =
- spirit::make_default_multi_pass(base_iterator_type(in));
- std::vector<double> v;
- bool result = spirit::qi::phrase_parse(first
- , spirit::make_default_multi_pass(base_iterator_type())
- , double_ >> *(',' >> double_) // recognize list of doubles
- , space | '#' >> *(char_ - eol) >> eol // comment skipper
- , v); // data read from file
- if (!result) {
- std::cout << "Failed parsing input file!" << std::endl;
- return -2;
- }
- std::cout << "Successfully parsed input file!" << std::endl;
- return 0;
- }
- //]
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