[Minor] Reserve vector - to minimize reallocation costs

Reserving vector to save on reallocation costs, where we know the size in advance. (cherry picked from commit 2c69483)
qgis · Jan 29, 2019 · 66c07d7 · 66c07d7
1 parent 1143502
commit 66c07d7
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/analysis/raster/qgsrelief.cpp b/src/analysis/raster/qgsrelief.cpp
@@ -639,6 +639,7 @@ QList< QgsRelief::ReliefColor > QgsRelief::calculateOptimizedReliefClasses()
 
   //set colors according to optimised class breaks
   QVector<QColor> colorList;
+  colorList.reserve( 9 );
   colorList.push_back( QColor( 7, 165, 144 ) );
   colorList.push_back( QColor( 12, 221, 162 ) );
   colorList.push_back( QColor( 33, 252, 183 ) );
@@ -670,6 +671,7 @@ void QgsRelief::optimiseClassBreaks( QList<int> &breaks, double *frequencies )
   {
     //get all the values between the class breaks into input
     QList< QPair < int, double > > regressionInput;
+    regressionInput.reserve( breaks.at( i + 1 ) - breaks.at( i ) );
     for ( int j = breaks.at( i ); j < breaks.at( i + 1 ); ++j )
     {
       regressionInput.push_back( qMakePair( j, frequencies[j] ) );