[Example] Fix the cpp example complier flag

cpp-package/example/Makefile

@@ -41,7 +41,7 @@ debug: prebuild all
 
 
 $(CPPEX_EXE):% : %.cpp
-	$(CXX) -std=c++0x $(CFLAGS)  $(CPPEX_CFLAGS) -o build/$@ $(filter %.cpp %.a, $^) $(CPPEX_EXTRA_LDFLAGS)
+	$(CXX) -std=c++11 $(CFLAGS)  $(CPPEX_CFLAGS) -o build/$@ $(filter %.cpp %.a, $^) $(CPPEX_EXTRA_LDFLAGS)
 
 clean:
 	@rm -rf build

cpp-package/example/example.mk

@@ -30,8 +30,8 @@ cpp-package-example-all: cpp-package-all $(CPPEX_EXE)
 
 build/cpp-package/example/% : cpp-package/example/%.cpp lib/libmxnet.so $(CPP_PACKAGE_OP_H_FILE)
 	@mkdir -p $(@D)
-	$(CXX) -std=c++0x $(CFLAGS) $(CPPEX_CFLAGS) -MM -MT cpp-package/example/$* $< >build/cpp-package/example//$*.d
-	$(CXX) -std=c++0x $(CFLAGS) $(CPPEX_CFLAGS) -o $@ $(filter %.cpp %.a, $^) $(LDFLAGS) $(CPPEX_EXTRA_LDFLAGS)
+	$(CXX) -std=c++11 $(CFLAGS) $(CPPEX_CFLAGS) -MM -MT cpp-package/example/$* $< >build/cpp-package/example//$*.d
+	$(CXX) -std=c++11 $(CFLAGS) $(CPPEX_CFLAGS) -o $@ $(filter %.cpp %.a, $^) $(LDFLAGS) $(CPPEX_EXTRA_LDFLAGS)
 
 cpp-package-example-clean:
 	rm -rf build/cpp-package/example/*

cpp-package/example/feature_extract/Makefile

@@ -27,12 +27,12 @@ LDFLAGS=$(COMMFLAGS) -L ../../../lib -lmxnet $(BLAS) $(CUDA) -lgomp -pthread
 all: feature_extract prepare_data_with_opencv
 
 feature_extract: ./feature_extract.cpp
-	$(CXX) -c -std=c++0x $(CFLAGS) $^
+	$(CXX) -c -std=c++11 $(CFLAGS) $^
 	$(CXX) $(basename $@).o -o $@ $(LDFLAGS)
 	-rm -f $(basename $@).o
 
 prepare_data_with_opencv: ./prepare_data_with_opencv.cpp
-	$(CXX) -c -std=c++0x $(OPENCV_CFLAGS) $^
+	$(CXX) -c -std=c++11 $(OPENCV_CFLAGS) $^
 	$(CXX) $(basename $@).o -o $@ $(OPENCV_LDFLAGS)
 	-rm -f $(basename $@).o