[ruby] add a test for null shared_ptr in containers.

Examples/test-suite/cpp11_shared_ptr_nullptr_in_containers.i

@@ -0,0 +1,48 @@
+%module cpp11_shared_ptr_nullptr_in_containers
+
+%{
+#include <memory>
+#include <vector>
+%}
+
+%include <std_shared_ptr.i>
+%include <std_vector.i>
+
+%shared_ptr(C)
+
+%inline %{
+
+class C {
+public:
+  C() : m(-1) {}
+  C(int i) : m(i) {}
+  int get_m() { return m; }
+  int m;
+};
+
+%}
+
+%template() std::vector<std::shared_ptr<C> >;
+
+%inline %{
+
+  std::vector<std::shared_ptr<C> > ret_vec_c_shared_ptr() {
+    std::vector<std::shared_ptr<C> > ret(3);
+    ret[0] = std::shared_ptr<C>(new C(0));
+    ret[2] = std::shared_ptr<C>(new C(2));
+    return ret;
+  }
+
+  std::vector<std::shared_ptr<C> > ret_arg_vec(const std::vector<std::shared_ptr<C> >& v) {
+    return v;
+  }
+
+  bool is_last_null(const std::vector<std::shared_ptr<C> >& v) {
+    if( *v.end() ) {
+      return false;
+    } else {
+      return true;
+    }
+  }
+
+%}

Examples/test-suite/ruby/cpp11_shared_ptr_nullptr_in_containers_runme.rb

@@ -0,0 +1,15 @@
+require "cpp11_shared_ptr_nullptr_in_containers"
+
+include Cpp11_shared_ptr_nullptr_in_containers
+
+a = ret_vec_c_shared_ptr()
+raise unless a[0].get_m == 0
+raise unless a[1]       == nil
+raise unless a[2].get_m == 2
+
+a = ret_arg_vec([C.new(7), nil, C.new(9)])
+raise unless a[0].get_m == 7
+raise unless a[1]       == nil
+raise unless a[2].get_m == 9
+
+raise unless is_last_null([C.new(7), C.new(8), nil])