1 //  Copyright (c) 2001-2011 Hartmut Kaiser
2 //
3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5 
6 #if !defined(BOOST_SPIRIT_KARMA_UNUSED_DELIMITER_MAR_15_2009_0923PM)
7 #define BOOST_SPIRIT_KARMA_UNUSED_DELIMITER_MAR_15_2009_0923PM
8 
9 #if defined(_MSC_VER)
10 #pragma once
11 #endif
12 
13 #include <boost/spirit/home/support/unused.hpp>
14 
15 namespace boost { namespace spirit { namespace karma { namespace detail
16 {
17     template <typename Delimiter>
18     struct unused_delimiter : unused_type
19     {
unused_delimiterboost::spirit::karma::detail::unused_delimiter20         unused_delimiter(Delimiter const& delim)
21           : delimiter(delim) {}
22         Delimiter const& delimiter;
23 
24         // silence MSVC warning C4512: assignment operator could not be generated
25         BOOST_DELETED_FUNCTION(unused_delimiter& operator= (unused_delimiter const&))
26     };
27 
28     // If a surrounding verbatim[] directive was specified, the current
29     // delimiter is of the type unused_delimiter. In this case we
30     // re-activate the delimiter which was active before the verbatim[]
31     // directive.
32     template <typename Delimiter, typename Default>
33     inline Delimiter const&
get_delimiter(unused_delimiter<Delimiter> const & u,Default const &)34     get_delimiter(unused_delimiter<Delimiter> const& u, Default const&)
35     {
36         return u.delimiter;
37     }
38 
39     // If no surrounding verbatim[] directive was specified we activate
40     // a single space as the delimiter to use.
41     template <typename Delimiter, typename Default>
42     inline Default const&
get_delimiter(Delimiter const &,Default const & d)43     get_delimiter(Delimiter const&, Default const& d)
44     {
45         return d;
46     }
47 
48 }}}}
49 
50 #endif
51