[Boost-commit] svn:boost r51173 - sandbox/miscellanea_algorithm/boost/algorithm

Subject: [Boost-commit] svn:boost r51173 - sandbox/miscellanea_algorithm/boost/algorithm
From: erwann.rogard_at_[hidden]
Date: 2009-02-10 03:51:52

Author: e_r
Date: 2009-02-10 03:51:51 EST (Tue, 10 Feb 2009)
New Revision: 51173
URL: http://svn.boost.org/trac/boost/changeset/51173

Log:
adding l2_norm_squared.hpp to misc*algorithm
Added:
   sandbox/miscellanea_algorithm/boost/algorithm/l2_norm_squared.hpp   (contents, props changed)

Added: sandbox/miscellanea_algorithm/boost/algorithm/l2_norm_squared.hpp
==============================================================================
--- (empty file)
+++ sandbox/miscellanea_algorithm/boost/algorithm/l2_norm_squared.hpp	2009-02-10 03:51:51 EST (Tue, 10 Feb 2009)
@@ -0,0 +1,34 @@
+#ifndef BOOST_ALGORITHM_L2_NORM_SQUARED_HPP_ER_2009
+#define BOOST_ALGORITHM_L2_NORM_SQUARED_HPP_ER_2009
+#include <numeric>
+#include <boost/range.hpp>
+#include <boost/range/value_type.hpp>
+
+namespace boost{
+
+class l2_norm_squared{
+    public:
+    l2_norm_squared(){}
+    template<typename R0>
+    typename range_value<R0>::type
+    operator()(const R0& r0)const{
+        typedef typename range_value<R0>::type result_type;
+        return std::accumulate(
+            boost::begin(r0),
+            boost::end(r0),
+            (result_type)(0),
+            bin_op<result_type>()
+        );
+    };
+
+    private:
+
+    template<typename T>
+    struct bin_op{
+        bin_op(){}
+        T operator()(T x,T y)const{ return x + y*y; }
+    };
+};
+
+}
+#endif