35 lines
1.2 KiB
C++
Executable File
35 lines
1.2 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2001-2007 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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#if !defined(BOOST_SPIRIT_WHAT_APRIL_21_2007_0732AM)
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#define BOOST_SPIRIT_WHAT_APRIL_21_2007_0732AM
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#include <boost/spirit/home/qi/meta_grammar.hpp>
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#include <boost/mpl/assert.hpp>
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#include <string>
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namespace boost { namespace spirit { namespace qi
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{
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template <typename Expr>
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inline std::string what(Expr const& xpr)
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{
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typedef spirit::traits::is_component<qi::domain, Expr> is_component;
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// report invalid expression error as early as possible
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BOOST_MPL_ASSERT_MSG(
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is_component::value,
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xpr_is_not_convertible_to_a_parser, ());
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typedef typename result_of::as_component<qi::domain, Expr>::type component;
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typedef typename component::director director;
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component c = spirit::as_component(qi::domain(), xpr);
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return director::what(c, unused);
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}
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}}}
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#endif
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