>From 3f84440651064c5352bfa5db7e0ca4610599a127 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <address@hidden>
Date: Sun, 15 Feb 2015 15:45:58 +0100
Subject: [PATCH] Micro optimization in
 CensusView::column_value_varies_across_cells().

Move an invariant value out of the loop to speed up this function by ~25%.
---
 census_view.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/census_view.cpp b/census_view.cpp
index 50ea156..cfc3f66 100644
--- a/census_view.cpp
+++ b/census_view.cpp
@@ -933,10 +933,12 @@ Input* CensusView::class_parms_from_class_name(std::string const& class_name)
     ,std::vector<Input> const& cells
     ) const
 {
+    const any_member<Input>& case_value = case_parms()[0][header];
+
     typedef std::vector<Input>::const_iterator ici;
     for(ici j = cells.begin(); j != cells.end(); ++j)
         {
-        if(!((*j)[header] == case_parms()[0][header]))
+        if(!((*j)[header] == case_value))
             {
             return true;
             }
-- 
2.1.0