Added boost header

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

@@ -0,0 +1,141 @@
+///////////////////////////////////////////////////////////////////////////////
+// sum.hpp
+//
+//  Copyright 2005 Eric Niebler. 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_SUM_HPP_EAN_28_10_2005
+#define BOOST_ACCUMULATORS_STATISTICS_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>
+#include <boost/accumulators/statistics/count.hpp>
+
+namespace boost { namespace accumulators
+{
+
+namespace impl
+{
+    ///////////////////////////////////////////////////////////////////////////////
+    // sum_impl
+    template<typename Sample, typename Tag>
+    struct sum_impl
+      : accumulator_base
+    {
+        // for boost::result_of
+        typedef Sample result_type;
+
+        template<typename Args>
+        sum_impl(Args const &args)
+          : sum(args[parameter::keyword<Tag>::get() | Sample()])
+        {
+        }
+
+        template<typename Args>
+        void operator ()(Args const &args)
+        {
+            // what about overflow?
+            this->sum += args[parameter::keyword<Tag>::get()];
+        }
+
+        result_type result(dont_care) const
+        {
+            return this->sum;
+        }
+
+    private:
+
+        Sample sum;
+    };
+
+} // namespace impl
+
+///////////////////////////////////////////////////////////////////////////////
+// tag::sum
+// tag::sum_of_weights
+// tag::sum_of_variates
+//
+namespace tag
+{
+    struct sum
+      : depends_on<>
+    {
+        /// INTERNAL ONLY
+        ///
+        typedef accumulators::impl::sum_impl<mpl::_1, tag::sample> impl;
+    };
+
+    struct sum_of_weights
+      : depends_on<>
+    {
+        typedef mpl::true_ is_weight_accumulator;
+        /// INTERNAL ONLY
+        ///
+        typedef accumulators::impl::sum_impl<mpl::_2, tag::weight> impl;
+    };
+
+    template<typename VariateType, typename VariateTag>
+    struct sum_of_variates
+      : depends_on<>
+    {
+        /// INTERNAL ONLY
+        ///
+        typedef mpl::always<accumulators::impl::sum_impl<VariateType, VariateTag> > impl;
+    };
+
+    struct abstract_sum_of_variates
+      : depends_on<>
+    {
+    };
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// extract::sum
+// extract::sum_of_weights
+// extract::sum_of_variates
+//
+namespace extract
+{
+    extractor<tag::sum> const sum = {};
+    extractor<tag::sum_of_weights> const sum_of_weights = {};
+    extractor<tag::abstract_sum_of_variates> const sum_of_variates = {};
+
+    BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum)
+    BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_weights)
+    BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_variates)
+}
+
+using extract::sum;
+using extract::sum_of_weights;
+using extract::sum_of_variates;
+
+// So that mean can be automatically substituted with
+// weighted_mean when the weight parameter is non-void.
+template<>
+struct as_weighted_feature<tag::sum>
+{
+    typedef tag::weighted_sum type;
+};
+
+template<>
+struct feature_of<tag::weighted_sum>
+  : feature_of<tag::sum>
+{};
+
+template<typename VariateType, typename VariateTag>
+struct feature_of<tag::sum_of_variates<VariateType, VariateTag> >
+  : feature_of<tag::abstract_sum_of_variates>
+{
+};
+
+}} // namespace boost::accumulators
+
+#endif