[Boost-commit] svn:boost r44390 - trunk/boost/spirit/home/support/iterators/detail

From: hartmut.kaiser_at_[hidden]
Date: 2008-04-13 21:47:46

Author: hkaiser
Date: 2008-04-13 21:47:46 EDT (Sun, 13 Apr 2008)
New Revision: 44390
URL: http://svn.boost.org/trac/boost/changeset/44390

Log:
Applied a minor optimization to one of the multi_pass policies.
Text files modified: 
   trunk/boost/spirit/home/support/iterators/detail/split_std_deque_policy.hpp |    10 +++++-----                              
   1 files changed, 5 insertions(+), 5 deletions(-)

Modified: trunk/boost/spirit/home/support/iterators/detail/split_std_deque_policy.hpp
==============================================================================
--- trunk/boost/spirit/home/support/iterators/detail/split_std_deque_policy.hpp	(original)
+++ trunk/boost/spirit/home/support/iterators/detail/split_std_deque_policy.hpp	2008-04-13 21:47:46 EDT (Sun, 13 Apr 2008)
@@ -25,7 +25,7 @@
     ///////////////////////////////////////////////////////////////////////////
     struct split_std_deque
     {
-        enum { threshold = 1000 };
+        enum { threshold = 16 };
         
         ///////////////////////////////////////////////////////////////////////
         template <typename Value>
@@ -89,13 +89,13 @@
                         // free up the memory used by the queue. we avoid 
                         // clearing the queue on every increment, though, 
                         // because this would be too time consuming
-                        queue.clear();
-                        queue.reserve(threshold);
+
+                        // erase all but first item in queue
+                        queue.erase(queue.begin()+1, queue.end());
                         mp.queued_position = 0;
                         
-                        // create a new entry in the queue and initialize 
+                        // reuse first entry in the queue and initialize 
                         // it from the input
-                        queue.push_back(Value());
                         MultiPass::advance_input(mp, queue[mp.queued_position++]);
                     }
                     else