using STL string/container to replace QT code

cpp/.gitignore

@@ -0,0 +1,4 @@
+libdiff_match_patch.a
+objs/
+.d/
+test_diff_match_patch

cpp/Makefile

@@ -0,0 +1,46 @@
+SOURCES := diff_match_patch.cpp diff_match_patch_util.cpp
+
+OBJDIR := objs
+
+OBJECTS := $(addprefix $(OBJDIR)/, $(notdir $(patsubst %.cpp,%.o,$(SOURCES))))
+OUT_LIB := libdiff_match_patch.a
+
+CXXFLAGS := -std=c++17 \
+	-g -O0
+
+TEST_SRC := diff_match_patch_test.cpp
+TEST_OBJECTS := $(addprefix $(OBJDIR)/, $(notdir $(patsubst %.cpp,%.o,$(TEST_SRC))))
+TEST_EXEC := test_diff_match_patch
+
+DEPDIR := .d
+DEPFLAGS = -MT $@ -MMD -MP -MF$(DEPDIR)/$*.Td
+
+POSTCOMPILE = @mv -f $(DEPDIR)/$*.Td $(DEPDIR)/$*.d && touch $@
+
+ALL_SRC := $(SOURCES) $(TEST_SRC)
+
+.PHONY: all clean init
+
+all: init $(OUT_LIB) $(TEST_EXEC)
+
+$(OBJDIR)/%.o : %.cpp %.h $(DEPDIR)/%.d
+	$(CXX) $(DEPFLAGS) $(CFLAGS) $(CXXFLAGS) $(CPPFLAGS) -c -o "$@" "$<"
+	$(POSTCOMPILE)
+
+$(OUT_LIB) : $(OBJECTS)
+	$(AR) -rv "$@" $(OBJECTS)
+
+$(TEST_EXEC) : $(TEST_OBJECTS) $(OUT_LIB)
+	$(CXX) $(LDFLAGS) -o "$@" "$<" $(OUT_LIB)
+
+init:
+	mkdir -p $(OBJDIR) $(DEPDIR)
+
+clean:
+	$(RM) -r $(OUT_LIB) $(OBJDIR) $(TEST_EXEC) $(DEPDIR)
+
+$(DEPDIR)/%.d: ;
+.PRECIOUS: $(DEPDIR)/%.d
+
+
+include $(wildcard $(patsubst %,$(DEPDIR)/%.d,$(basename $(ALL_SRC))))