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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // error_of.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_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005 | |
9 | #define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005 | |
10 | ||
11 | #include <boost/mpl/placeholders.hpp> | |
12 | #include <boost/accumulators/framework/accumulator_base.hpp> | |
13 | #include <boost/accumulators/framework/extractor.hpp> | |
14 | #include <boost/accumulators/framework/depends_on.hpp> | |
15 | #include <boost/accumulators/statistics_fwd.hpp> | |
16 | ||
17 | namespace boost { namespace accumulators | |
18 | { | |
19 | ||
20 | namespace impl | |
21 | { | |
22 | /// INTERNAL ONLY | |
23 | /// | |
24 | template<typename Feature> | |
25 | struct this_feature_has_no_error_calculation | |
26 | : mpl::false_ | |
27 | { | |
28 | }; | |
29 | ||
30 | /////////////////////////////////////////////////////////////////////////////// | |
31 | // error_of_impl | |
32 | /// INTERNAL ONLY | |
33 | /// | |
34 | template<typename Sample, typename Feature> | |
35 | struct error_of_impl | |
36 | : accumulator_base | |
37 | { | |
38 | // TODO: specialize this on the specific features that have errors we're | |
39 | // interested in. | |
40 | BOOST_MPL_ASSERT((this_feature_has_no_error_calculation<Feature>)); | |
41 | ||
42 | // for boost::result_of | |
43 | typedef int result_type; | |
44 | ||
45 | error_of_impl(dont_care) | |
46 | { | |
47 | } | |
48 | ||
49 | result_type result(dont_care) const | |
50 | { | |
51 | return 0; | |
52 | } | |
53 | }; | |
54 | ||
55 | } // namespace impl | |
56 | ||
57 | /////////////////////////////////////////////////////////////////////////////// | |
58 | // tag::error_of | |
59 | // | |
60 | namespace tag | |
61 | { | |
62 | template<typename Feature> | |
63 | struct error_of | |
64 | : depends_on<Feature> | |
65 | { | |
66 | /// INTERNAL ONLY | |
67 | /// | |
68 | typedef accumulators::impl::error_of_impl<mpl::_1, Feature> impl; | |
69 | }; | |
70 | } | |
71 | ||
72 | /////////////////////////////////////////////////////////////////////////////// | |
73 | // extract::error_of | |
74 | // | |
75 | namespace extract | |
76 | { | |
77 | BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, error_of, (typename)) | |
78 | } | |
79 | ||
80 | using extract::error_of; | |
81 | ||
82 | // make tag::error_of<tag::feature(modifier)> work | |
83 | template<typename Feature> | |
84 | struct as_feature<tag::error_of<Feature> > | |
85 | { | |
86 | typedef tag::error_of<typename as_feature<Feature>::type> type; | |
87 | }; | |
88 | ||
89 | // make error_of<tag::mean> work with non-void weights (should become | |
90 | // error_of<tag::weighted_mean> | |
91 | template<typename Feature> | |
92 | struct as_weighted_feature<tag::error_of<Feature> > | |
93 | { | |
94 | typedef tag::error_of<typename as_weighted_feature<Feature>::type> type; | |
95 | }; | |
96 | ||
97 | }} // namespace boost::accumulators | |
98 | ||
99 | #endif |