test_limit_reference.cc: Don't use auto where a slot is required

The return values of sigc::bind() and sigc::bind_return() shall be
converted to sigc::slot, otherwise automatic disconnection does not work.
Fixes #44

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/test_limit_reference.cc b/tests/test_limit_reference.cc
index 8d1340d..a115d6d 100644
--- a/tests/test_limit_reference.cc
+++ b/tests/test_limit_reference.cc
@@ -14,6 +14,8 @@ class Base : virtual public sigc::trackable
 public:
   Base() {}
 
+  Base(const Base& src) = default;
+  Base& operator=(const Base& src) = default;
   Base(Base&& src) = delete;
   Base& operator=(Base&& src) = delete;
 };
@@ -47,11 +49,11 @@ main(int argc, char* argv[])
   handler();
   util->check_result(result_stream, "method()");
 
-  auto param = sigc::bind(sigc::slot<void(Derived&)>(), std::ref(*instance));
+  sigc::slot<void()> param = sigc::bind(sigc::slot<void(Derived&)>(), std::ref(*instance));
   param();
   util->check_result(result_stream, "");
 
-  auto ret = sigc::bind_return(sigc::slot<void()>(), std::ref(*instance));
+  sigc::slot<Derived()> ret = sigc::bind_return(sigc::slot<void()>(), std::ref(*instance));
   ret();
   util->check_result(result_stream, "");