Added boost header

test/external/boost/accumulators/statistics/weighted_sum.hpp

@@ -0,0 +1,116 @@
+///////////////////////////////////////////////////////////////////////////////
+// weighted_sum.hpp
+//
+//  Copyright 2006 Eric Niebler, Olivier Gygi. Distributed under 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)
+
+#ifndef BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_SUM_HPP_EAN_28_10_2005
+#define BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_SUM_HPP_EAN_28_10_2005
+
+#include <boost/mpl/placeholders.hpp>
+#include <boost/accumulators/framework/accumulator_base.hpp>
+#include <boost/accumulators/framework/extractor.hpp>
+#include <boost/accumulators/numeric/functional.hpp>
+#include <boost/accumulators/framework/parameters/sample.hpp>
+#include <boost/accumulators/framework/parameters/weight.hpp>
+#include <boost/accumulators/framework/accumulators/external_accumulator.hpp>
+#include <boost/accumulators/framework/depends_on.hpp>
+#include <boost/accumulators/statistics_fwd.hpp>
+
+namespace boost { namespace accumulators
+{
+
+namespace impl
+{
+    ///////////////////////////////////////////////////////////////////////////////
+    // weighted_sum_impl
+    template<typename Sample, typename Weight, typename Tag>
+    struct weighted_sum_impl
+      : accumulator_base
+    {
+        typedef typename numeric::functional::multiplies<Sample, Weight>::result_type weighted_sample;
+
+        // for boost::result_of
+        typedef weighted_sample result_type;
+
+        template<typename Args>
+        weighted_sum_impl(Args const &args)
+          : weighted_sum_(
+                args[parameter::keyword<Tag>::get() | Sample()]
+                  * numeric::one<Weight>::value
+            )
+        {
+        }
+
+        template<typename Args>
+        void operator ()(Args const &args)
+        {
+            // what about overflow?
+            this->weighted_sum_ += args[parameter::keyword<Tag>::get()] * args[weight];
+        }
+
+        result_type result(dont_care) const
+        {
+            return this->weighted_sum_;
+        }
+
+    private:
+
+        weighted_sample weighted_sum_;
+    };
+
+} // namespace impl
+
+///////////////////////////////////////////////////////////////////////////////
+// tag::weighted_sum
+//
+namespace tag
+{
+    struct weighted_sum
+      : depends_on<>
+    {
+        /// INTERNAL ONLY
+        ///
+        typedef accumulators::impl::weighted_sum_impl<mpl::_1, mpl::_2, tag::sample> impl;
+    };
+
+    template<typename VariateType, typename VariateTag>
+    struct weighted_sum_of_variates
+      : depends_on<>
+    {
+        /// INTERNAL ONLY
+        ///
+        typedef accumulators::impl::weighted_sum_impl<VariateType, mpl::_2, VariateTag> impl;
+    };
+
+    struct abstract_weighted_sum_of_variates
+      : depends_on<>
+    {
+    };
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// extract::weighted_sum
+//
+namespace extract
+{
+    extractor<tag::weighted_sum> const weighted_sum = {};
+    extractor<tag::abstract_weighted_sum_of_variates> const weighted_sum_of_variates = {};
+
+    BOOST_ACCUMULATORS_IGNORE_GLOBAL(weighted_sum)
+    BOOST_ACCUMULATORS_IGNORE_GLOBAL(weighted_sum_of_variates)
+}
+
+using extract::weighted_sum;
+using extract::weighted_sum_of_variates;
+
+template<typename VariateType, typename VariateTag>
+struct feature_of<tag::weighted_sum_of_variates<VariateType, VariateTag> >
+  : feature_of<tag::abstract_weighted_sum_of_variates>
+{
+};
+
+}} // namespace boost::accumulators
+
+#endif