reenable missing INPUT/OUTPUT, and add tests for std::string

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@8637 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/li_std_string.i

@@ -1,5 +1,11 @@
 %module li_std_string
-%include "std_string.i"
+%include <std_string.i>
+
+#if defined(SWIGUTL)
+%apply std::string& INPUT { std::string &input }
+%apply std::string& INOUT { std::string &inout }
+#endif
+
 
 %inline %{
 
@@ -35,6 +41,14 @@ std::string& test_reference_out() {
    return x;
 }
 
+std::string test_reference_input(std::string &input) {
+  return input;
+}
+
+void test_reference_inout(std::string &inout) {
+  inout += inout;
+}
+
 #if defined(_MSC_VER)
   #pragma warning(disable: 4290) // C++ exception specification ignored except to indicate a function is not __declspec(nothrow)
 #endif