51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/support_multi_pass.hpp>
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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//[tutorial_multi_pass
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int main()
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{
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namespace spirit = boost::spirit;
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using spirit::ascii::space;
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using spirit::ascii::char_;
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using spirit::qi::double_;
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using spirit::qi::eol;
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std::ifstream in("multi_pass.txt"); // we get our input from this file
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if (!in.is_open()) {
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std::cout << "Could not open input file: 'multi_pass.txt'" << std::endl;
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return -1;
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}
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typedef std::istreambuf_iterator<char> base_iterator_type;
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spirit::multi_pass<base_iterator_type> first =
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spirit::make_default_multi_pass(base_iterator_type(in));
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std::vector<double> v;
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bool result = spirit::qi::phrase_parse(first
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, spirit::make_default_multi_pass(base_iterator_type())
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, double_ >> *(',' >> double_) // recognize list of doubles
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, space | '#' >> *(char_ - eol) >> eol // comment skipper
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, v); // data read from file
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if (!result) {
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std::cout << "Failed parsing input file!" << std::endl;
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return -2;
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}
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std::cout << "Successfully parsed input file!" << std::endl;
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return 0;
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}
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//]
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