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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // accumulator_base.hpp | |
3 | // | |
4 | // Copyright 2005 Eric Niebler. Distributed under the Boost | |
5 | // Software License, Version 1.0. (See accompanying file | |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | #ifndef BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_BASE_HPP_EAN_28_10_2005 | |
9 | #define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_BASE_HPP_EAN_28_10_2005 | |
10 | ||
11 | #include <boost/mpl/placeholders.hpp> | |
12 | #include <boost/mpl/joint_view.hpp> | |
13 | #include <boost/mpl/single_view.hpp> | |
14 | #include <boost/mpl/fold.hpp> | |
15 | #include <boost/mpl/contains.hpp> | |
16 | #include <boost/mpl/empty_sequence.hpp> | |
17 | #include <boost/accumulators/framework/accumulator_concept.hpp> | |
18 | ||
19 | namespace boost { namespace accumulators | |
20 | { | |
21 | ||
22 | namespace detail | |
23 | { | |
24 | typedef void void_; | |
25 | } | |
26 | ||
27 | /////////////////////////////////////////////////////////////////////////////// | |
28 | // dont_care | |
29 | // | |
30 | struct dont_care | |
31 | { | |
32 | template<typename Args> | |
33 | dont_care(Args const &) | |
34 | { | |
35 | } | |
36 | }; | |
37 | ||
38 | /////////////////////////////////////////////////////////////////////////////// | |
39 | // accumulator_base | |
40 | // | |
41 | struct accumulator_base | |
42 | { | |
43 | // hidden if defined in derived classes | |
44 | detail::void_ operator ()(dont_care) | |
45 | { | |
46 | } | |
47 | ||
48 | typedef mpl::false_ is_droppable; | |
49 | ||
50 | detail::void_ add_ref(dont_care) | |
51 | { | |
52 | } | |
53 | ||
54 | detail::void_ drop(dont_care) | |
55 | { | |
56 | } | |
57 | ||
58 | detail::void_ on_drop(dont_care) | |
59 | { | |
60 | } | |
61 | }; | |
62 | ||
63 | }} // namespace boost::accumulators | |
64 | ||
65 | #endif |