[Boost-commit] svn:boost r46540 - trunk/libs/accumulators/example

From: eric_at_[hidden]
Date: 2008-06-19 22:34:00

Author: eric_niebler
Date: 2008-06-19 22:34:00 EDT (Thu, 19 Jun 2008)
New Revision: 46540
URL: http://svn.boost.org/trac/boost/changeset/46540

Log:
alternate way to use an accumulator with an algorithm
Text files modified: 
   trunk/libs/accumulators/example/main.cpp |     9 ++++++++-                               
   1 files changed, 8 insertions(+), 1 deletions(-)

Modified: trunk/libs/accumulators/example/main.cpp
==============================================================================
--- trunk/libs/accumulators/example/main.cpp	(original)
+++ trunk/libs/accumulators/example/main.cpp	2008-06-19 22:34:00 EDT (Thu, 19 Jun 2008)
@@ -7,6 +7,8 @@
 
 #include <iostream>
 #include <algorithm>
+#include <boost/ref.hpp>
+#include <boost/bind.hpp>
 #include <boost/array.hpp>
 #include <boost/foreach.hpp>
 #include <boost/accumulators/accumulators.hpp>
@@ -47,6 +49,11 @@
     // time, and returns a copy of the accumulator.
     acc = std::for_each(data.begin(), data.end(), acc);
 
+    // The following would be equivalent, and could be more efficient
+    // because it doesn't pass and return the entire accumulator set
+    // by value.
+    //std::for_each(data.begin(), data.end(), bind<void>(ref(acc), _1));
+
     std::cout << "  min(acc)        = " << (min)(acc) << std::endl;
     std::cout << "  mean(acc)       = " << mean(acc) << std::endl;
 
@@ -59,7 +66,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 // example2
 //
-//  Calculate some tail statistics. This demonstrates how to specify 
+//  Calculate some tail statistics. This demonstrates how to specify
 //  constructor and accumulator parameters. Note that the tail statistics
 //  return multiple values, which are returned in an iterator_range.
 //