common_type used in operators

Makefile

@@ -0,0 +1,16 @@
+# $@ -- The file name of the target of the rule.
+# $* -- The stem with which an implicit rule matches
+# $< -- The name of the first prerequisite.
+# $^ -- The names of all the prerequisites
+# $(VARS:%.cpp=%.o) -- pattern replace
+
+CC:=g++-4.9
+
+OPTS:=-std=c++14 -fmax-errors=5 -g -O0 -Wsign-compare -Wreturn-type -Wparentheses -Wpedantic -Wconversion-null
+
+
+test_aga2: tests/test_aga2.cpp aga2.hpp
+	${CC} -o test_aga2 tests/test_aga2.cpp ${OPTS}
+
+clean:
+	rm -rf b/* bin/*