Allow remote cell as argument to get_face_neighbors_of().

Makefile

@@ -34,6 +34,7 @@ include \
   tests/get_cell_datatype/project_makefile \
   tests/constructors/project_makefile \
   tests/get_neighbors_/project_makefile \
+  tests/get_face_neighbors/project_makefile \
   tests/iterators/project_makefile \
   tests/additional_cell_data/project_makefile \
   tests/mpi_support/project_makefile \

dccrg.hpp

@@ -2820,10 +2820,6 @@ template <
 
 		std::vector<std::pair<uint64_t, int> > ret_val;
 
-		if (this->cell_data.count(cell) == 0) {
-			return ret_val;
-		}
-
 		if (this->neighbors_.count(cell) == 0) {
 			std::cerr << __FILE__ << ":" << __LINE__
 				<< " Internal error." << std::endl;

tests/get_face_neighbors/Makefile

@@ -0,0 +1,10 @@
+all:
+	@$(MAKE) tests/get_face_neighbors/executables -C ../..
+
+t: test
+test:
+	@$(MAKE) tests/get_face_neighbors/tests -C ../..
+
+c: clean
+clean:
+	@$(MAKE) tests/get_face_neighbors/clean -C ../..

tests/get_face_neighbors/project_makefile

@@ -0,0 +1,52 @@
+TESTS_GET_FACE_NEIGHBORS_EXECUTABLES = \
+  tests/get_face_neighbors/test1.exe
+
+TESTS_GET_FACE_NEIGHBORS_TESTS = \
+  tests/get_face_neighbors/test1.tst \
+  tests/get_face_neighbors/test1.tstN
+
+tests/get_face_neighbors/executables: $(TESTS_GET_FACE_NEIGHBORS_EXECUTABLES)
+
+tests/get_face_neighbors/tests: $(TESTS_GET_FACE_NEIGHBORS_TESTS)
+
+tests/get_face_neighbors/clean:
+	@printf "CLEAN tests/get_face_neighbors\n" && rm -f \
+	  $(TESTS_GET_FACE_NEIGHBORS_EXECUTABLES) \
+	  $(TESTS_GET_FACE_NEIGHBORS_TESTS)
+
+
+EXECUTABLES += tests/get_face_neighbors/executables
+TESTS += tests/get_face_neighbors/tests
+CLEAN += tests/get_face_neighbors/clean
+
+
+TESTS_GET_FACE_NEIGHBORS_COMMON_DEPS = \
+  $(DCCRG_HEADERS) \
+  tests/get_face_neighbors/project_makefile \
+  $(ENVIRONMENT_MAKEFILE) \
+  Makefile
+
+TESTS_GET_FACE_NEIGHBORS_COMPILE_COMMAND = \
+  @printf "MPICXX $<\n" && $(MPICXX) $< -o $@ \
+  $(CPPFLAGS) \
+  $(CXXFLAGS) \
+  $(LDFLAGS) \
+  $(BOOST_CPPFLAGS) \
+  $(BOOST_LDFLAGS) \
+  $(BOOST_LIBS) \
+  $(ZOLTAN_CPPFLAGS) \
+  $(ZOLTAN_LDFLAGS) \
+  $(ZOLTAN_LIBS)
+
+tests/get_face_neighbors/test1.exe: \
+  tests/get_face_neighbors/test1.cpp \
+  $(TESTS_GET_FACE_NEIGHBORS_COMMON_DEPS)
+	$(TESTS_GET_FACE_NEIGHBORS_COMPILE_COMMAND)
+
+tests/get_face_neighbors/test1.tst: \
+  tests/get_face_neighbors/test1.exe
+	@printf RUN\ $<...\ \  && $(RUN) ./$< && printf "PASS\n" && touch $@
+
+tests/get_face_neighbors/test1.tstN: \
+  tests/get_face_neighbors/test1.exe
+	@printf MPIRUN\ $<...\ \  && $(MPIRUN) ./$< && printf "PASS\n" && touch $@