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1d90a9d621
- Add a rationale for parser::none. - Add a section introducing essential terminology. - Flesh out the semantic action example. - Add a section describing the parse context and how it works. - Remove numerous TODOs related to documentation addressed above.
42 lines
1.0 KiB
C++
42 lines
1.0 KiB
C++
// Copyright (C) 2020 T. Zachary Laine
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//[ semantic_action_example
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#include <boost/parser/parser.hpp>
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#include <iostream>
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#include <string>
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namespace bp = boost::parser;
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int main()
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{
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std::cout << "Enter a list of doubles, separated by commas. ";
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std::string input;
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std::getline(std::cin, input);
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std::vector<double> result;
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//[ semantic_action_example_lambda
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auto const action = [&result](auto & ctx) {
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std::cout << "Got one!\n";
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result.push_back(_attr(ctx));
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};
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//]
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auto const action_parser = bp::double_[action];
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auto const success = bp::parse(
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input, action_parser >> *(',' >> action_parser), bp::ascii::space);
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if (success) {
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std::cout << "You entered:\n";
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for (double x : result) {
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std::cout << x << "\n";
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}
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} else {
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std::cout << "Parse failure.\n";
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}
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}
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//]
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