109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2010 Joel de Guzman
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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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=============================================================================*/
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/lambda/lambda.hpp>
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#include <boost/bind.hpp>
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#include <iostream>
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// Presented are various ways to attach semantic actions
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// * Using plain function pointer
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// * Using simple function object
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// * Using boost.bind with a plain function
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// * Using boost.bind with a member function
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// * Using boost.lambda
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//[tutorial_semantic_action_functions
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namespace client
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{
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namespace qi = boost::spirit::qi;
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// A plain function
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void print(int const& i)
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{
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std::cout << i << std::endl;
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}
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// A member function
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struct writer
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{
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void print(int const& i) const
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{
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std::cout << i << std::endl;
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}
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};
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// A function object
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struct print_action
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{
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void operator()(int const& i, qi::unused_type, qi::unused_type) const
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{
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std::cout << i << std::endl;
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}
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};
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}
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//]
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int main()
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{
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using boost::spirit::qi::int_;
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using boost::spirit::qi::parse;
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using client::print;
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using client::writer;
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using client::print_action;
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{ // example using plain function
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char const *first = "{42}", *last = first + std::strlen(first);
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//[tutorial_attach_actions1
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parse(first, last, '{' >> int_[&print] >> '}');
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//]
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}
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{ // example using simple function object
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char const *first = "{43}", *last = first + std::strlen(first);
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//[tutorial_attach_actions2
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parse(first, last, '{' >> int_[print_action()] >> '}');
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//]
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}
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{ // example using boost.bind with a plain function
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char const *first = "{44}", *last = first + std::strlen(first);
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//[tutorial_attach_actions3
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parse(first, last, '{' >> int_[boost::bind(&print, _1)] >> '}');
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//]
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}
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{ // example using boost.bind with a member function
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char const *first = "{44}", *last = first + std::strlen(first);
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//[tutorial_attach_actions4
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writer w;
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parse(first, last, '{' >> int_[boost::bind(&writer::print, &w, _1)] >> '}');
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//]
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}
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{ // example using boost.lambda
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namespace lambda = boost::lambda;
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char const *first = "{45}", *last = first + std::strlen(first);
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using lambda::_1;
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//[tutorial_attach_actions5
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parse(first, last, '{' >> int_[std::cout << _1 << '\n'] >> '}');
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//]
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}
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return 0;
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}
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