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1/*=============================================================================
2 Copyright (c) 1998-2003 Joel de Guzman
3 Copyright (c) 2001 Daniel Nuffer
4 Copyright (c) 2002 Hartmut Kaiser
5 http://spirit.sourceforge.net/
6
7 Use, modification and distribution is subject to the Boost Software
8 License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
9 http://www.boost.org/LICENSE_1_0.txt)
10=============================================================================*/
11#if !defined(BOOST_SPIRIT_OPTIONAL_IPP)
12#define BOOST_SPIRIT_OPTIONAL_IPP
13
14namespace boost { namespace spirit {
15
16BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
17
18 ///////////////////////////////////////////////////////////////////////////
19 //
20 // optional class implementation
21 //
22 ///////////////////////////////////////////////////////////////////////////
23 template <typename S>
24 optional<S>
25 operator!(parser<S> const& a)
26 {
27 return optional<S>(a.derived());
28 }
29
30BOOST_SPIRIT_CLASSIC_NAMESPACE_END
31
32}} // namespace boost::spirit
33
34#endif