std::string_view posix tests

test/stdcpp/Makefile

@@ -12,7 +12,7 @@ all:
 clean:
 
 else
-all: $(addprefix $(ROOT)/,$(addsuffix .done,$(TESTS)))
+all: $(addprefix $(ROOT)/,$(addsuffix .done,$(TESTS))) $(ROOT)/string_view
 
 $(ROOT)/%.done : $(ROOT)/%
 	@echo Testing $*
@@ -24,6 +24,11 @@ $(ROOT)/%: $(SRC)/%_test.d $(SRC)/%.cpp
 	$(QUIET)$(CXX) $(CXXFLAGS) -c -o $(ROOT)/$*_cpp.o $(SRC)/$*.cpp
 	$(QUIET)$(DMD) $(DFLAGS) -main -unittest -of$@ $< $(ROOT)/$*_cpp.o
 
+$(ROOT)/string_view: $(SRC)/string_view_test.d $(SRC)/string_view.cpp
+	mkdir -p $(dir $@)
+	$(QUIET)$(CXX) $(CXXFLAGS) -std=c++17 -c -o $(ROOT)/string_view_cpp.o $(SRC)/string_view.cpp
+	$(QUIET)$(DMD) $(DFLAGS) -main -unittest -of$@ $< $(ROOT)/string_view_cpp.o
+
 clean:
 	rm -rf $(GENERATED)
 endif

test/stdcpp/src/string_view.cpp

@@ -1,7 +1,9 @@
 #include <string_view>
+#include <assert.h>
 
 int fromC_val(std::string_view);
 int fromC_ref(const std::string_view&);
+std::string_view getFromD();
 
 int sumOfElements_ref(const std::string_view& str)
 {
@@ -15,3 +17,9 @@ int sumOfElements_val(std::string_view str)
 {
     return sumOfElements_ref(str) + fromC_ref(str) + fromC_val(str);
 }
+
+std::string_view getFromC()
+{
+    assert(getFromD().compare("I'm from D!") == 0);
+    return std::string_view("I'm from C++!");
+}

test/stdcpp/src/string_view_test.d

@@ -16,6 +16,10 @@ unittest
     assert(str2.length == 0);
     assert(str2.empty == true);
     assert(str2[] == []);
+
+    assert(getFromC() == "I'm from C++!");
+
+    return 0;
 }
 
 
@@ -24,6 +28,7 @@ extern(C++):
 // test the ABI for calls to C++
 int sumOfElements_val(string_view);
 int sumOfElements_ref(ref const(string_view));
+string_view getFromC();
 
 // test the ABI for calls from C++
 int fromC_val(string_view str)
@@ -48,3 +53,8 @@ int fromC_ref(ref const(string_view) str)
         r += e;
     return r;
 }
+
+string_view getFromD()
+{
+    return string_view("I'm from D!");
+}