Faster initialization of attributes

Author: wonder-sk

src/core/qgsfeature.cpp

@@ -158,6 +158,15 @@ void QgsFeature::setValid( bool validity )
   mValid = validity;
 }
 
+void QgsFeature::initAttributes( int fieldCount )
+{
+  mAttributes.resize( fieldCount );
+  QVariant* ptr = mAttributes.data();
+  for ( int i = 0; i < fieldCount; ++i, ++ptr )
+    ptr->clear();
+}
+
+
 bool QgsFeature::setAttribute( const QString& name, QVariant value )
 {
   int fieldIdx = fieldNameIndex( name );

src/core/qgsfeature.h

@@ -141,7 +141,7 @@ class CORE_EXPORT QgsFeature
     QgsAttributes& attributes() { return mAttributes; }
     void setAttributes( const QgsAttributes& attrs ) { mAttributes = attrs; }
     void setAttribute( int field, const QVariant& attr ) { mAttributes[field] = attr; }
-    void initAttributes( int fieldCount ) { mAttributes.resize( fieldCount ); for ( int i = 0;i < fieldCount;++i ) mAttributes[i].clear(); }
+    void initAttributes( int fieldCount );
 
     /**Deletes an attribute and its value*/
     void deleteAttribute( int field );