Adds -Weffc++ flag to compilation flags
Adds -Weffc++ flag to compilation flags

ryanhaining/cppitertools,jkhoogland/cppitertools,ryanhaining/cppitertools,jkhoogland/cppitertools,tempbottle/cppitertools,tempbottle/cppitertools,jkhoogland/cppitertools,ryanhaining/cppitertools,tempbottle/cppitertools