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exclusive_or.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\spirit\core\composite\exclusive_or.hpp
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/*============================================================================= Copyright (c) 1998-2003 Joel de Guzman Copyright (c) 2001 Daniel Nuffer Copyright (c) 2002 Hartmut Kaiser http://spirit.sourceforge.net/ Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ #if !defined(BOOST_SPIRIT_EXCLUSIVE_OR_HPP) #define BOOST_SPIRIT_EXCLUSIVE_OR_HPP #include
#include
#include
#include
namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // // exclusive_or class // // Handles expressions of the form: // // a ^ b // // where a and b are parsers. The expression returns a composite // parser that matches a or b but not both. One (not both) of the // operands may be a literal char, wchar_t or a primitive string // char const*, wchar_t const*. // /////////////////////////////////////////////////////////////////////////// struct exclusive_or_parser_gen; template
struct exclusive_or : public binary
> > { typedef exclusive_or
self_t; typedef binary_parser_category parser_category_t; typedef exclusive_or_parser_gen parser_generator_t; typedef binary
> base_t; exclusive_or(A const& a, B const& b) : base_t(a, b) {} template
typename parser_result
::type parse(ScannerT const& scan) const { typedef typename parser_result
::type result_t; typedef typename ScannerT::iterator_t iterator_t; iterator_t save = scan.first; result_t l = this->left().parse(scan); std::swap(save, scan.first); result_t r = this->right().parse(scan); if (l ? !bool(r) : bool(r)) { if (l) scan.first = save; return l ? l : r; } return scan.no_match(); } }; struct exclusive_or_parser_gen { template
struct result { typedef exclusive_or< typename as_parser
::type , typename as_parser
::type > type; }; template
static exclusive_or< typename as_parser
::type , typename as_parser
::type > generate(A const& a, B const& b) { return exclusive_or
::type, BOOST_DEDUCED_TYPENAME as_parser
::type> (as_parser
::convert(a), as_parser
::convert(b)); } }; template
exclusive_or
operator^(parser
const& a, parser
const& b); template
exclusive_or
> operator^(parser
const& a, char b); template
exclusive_or
, B> operator^(char a, parser
const& b); template
exclusive_or
> operator^(parser
const& a, char const* b); template
exclusive_or
, B> operator^(char const* a, parser
const& b); template
exclusive_or
> operator^(parser
const& a, wchar_t b); template
exclusive_or
, B> operator^(wchar_t a, parser
const& b); template
exclusive_or
> operator^(parser
const& a, wchar_t const* b); template
exclusive_or
, B> operator^(wchar_t const* a, parser
const& b); }} // namespace boost::spirit #endif #include
exclusive_or.hpp
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