Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.


    Copyright (c) 2003 Vaclav Vesely

    Use, modification and distribution is subject to the Boost Software
    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
#include <boost/assert.hpp>
#include <iostream>
#include <boost/cstdlib.hpp>
#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_distinct.hpp>

using namespace std;
using namespace boost;
using namespace BOOST_SPIRIT_CLASSIC_NS;

struct my_grammar: public grammar<my_grammar>
    template <typename ScannerT>
    struct definition
        typedef rule<ScannerT> rule_t;

        // keyword_p for ASN.1
        dynamic_distinct_parser<ScannerT> keyword_p;

        definition(my_grammar const& self)
        :   keyword_p(alnum_p | ('-' >> ~ch_p('-'))) // ASN.1 has quite complex naming rules
                    keyword_p("asn-declare") // use keyword_p instead of std_p
                >>  !str_p("--")
                >>  keyword_p("ident")

        rule_t top;

        rule_t const& start() const
            return top;

int main()
    my_grammar gram;
    parse_info<> info;

    info = parse("asn-declare ident", gram, space_p);
    BOOST_ASSERT(info.full); // valid input

    info = parse("asn-declare--ident", gram, space_p);
    BOOST_ASSERT(info.full); // valid input

    info = parse("asn-declare-ident", gram, space_p);
    BOOST_ASSERT(!info.hit); // invalid input

    return exit_success;