test_rvalue_ref: Small fixes

* tests/.gitignore:
* tests/CMakeLists.txt:
* tests/Makefile.am: Add test_rvalue_ref.
* tests/test_rvalue_ref.cc: Avoid [-Werror=unused-parameter]
when building with warnings=fatal.

Some files have been reformated with clang-format in order to
make the CI tests happy. Reformated with clang-format 12, but CI
uses clang-format 10.

6 files changed, 16 insertions, 12 deletions

diff --git a/sigc++/functors/slot.h b/sigc++/functors/slot.h
index 8e9e01a..e368e86 100644
--- a/sigc++/functors/slot.h
+++ b/sigc++/functors/slot.h
@@ -151,8 +151,9 @@ struct slot_call
   static T_return call_it(slot_rep* rep, type_trait_take_t<T_arg>... a_)
   {
     auto typed_rep = static_cast<typed_slot_rep<T_functor>*>(rep);
-    return (*typed_rep->functor_).template operator()<type_trait_take_t<T_arg>...>(
-      std::forward<type_trait_take_t<T_arg>>(a_)...);
+    return (*typed_rep->functor_)
+      .template operator()<type_trait_take_t<T_arg>...>(
+        std::forward<type_trait_take_t<T_arg>>(a_)...);
   }
 
   /** Forms a function pointer from call_it().
diff --git a/sigc++/signal.h b/sigc++/signal.h
index 336bd5f..c1b0f33 100644
--- a/sigc++/signal.h
+++ b/sigc++/signal.h
@@ -364,8 +364,7 @@ public:
         continue;
 
       (sigc::internal::function_pointer_cast<call_type>(slot.rep_->call_))(
-        slot.rep_,
-        std::forward<type_trait_take_t<T_arg>>(a)...);
+        slot.rep_, std::forward<type_trait_take_t<T_arg>>(a)...);
     }
   }
 };
@@ -456,7 +455,8 @@ public:
   }
 
   /** Triggers the emission of the signal (see emit()). */
-  decltype(auto) operator()(type_trait_take_t<T_arg>... a) const {
+  decltype(auto) operator()(type_trait_take_t<T_arg>... a) const
+  {
     return emit(std::forward<type_trait_take_t<T_arg>>(a)...);
   }
 
diff --git a/tests/.gitignore b/tests/.gitignore
index 276abe2..0a788ab 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -24,6 +24,7 @@
 /test_ptr_fun
 /test_retype
 /test_retype_return
+/test_rvalue_ref
 /test_signal
 /test_signal_move
 /test_size
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 36e728b..9485b45 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -39,6 +39,7 @@ set (TEST_SOURCE_FILES
   test_ptr_fun.cc
   test_retype.cc
   test_retype_return.cc
+  test_rvalue_ref.cc
   test_signal.cc
   test_signal_move.cc
   test_size.cc
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 735d76b..b05f7b4 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -46,6 +46,7 @@ check_PROGRAMS = \
   test_ptr_fun \
   test_retype \
   test_retype_return \
+  test_rvalue_ref \
   test_signal \
   test_signal_move \
   test_size \
@@ -90,6 +91,7 @@ test_mem_fun_SOURCES         = test_mem_fun.cc $(sigc_test_util)
 test_ptr_fun_SOURCES         = test_ptr_fun.cc $(sigc_test_util)
 test_retype_SOURCES          = test_retype.cc $(sigc_test_util)
 test_retype_return_SOURCES   = test_retype_return.cc $(sigc_test_util)
+test_rvalue_ref_SOURCES      = test_rvalue_ref.cc $(sigc_test_util)
 test_signal_SOURCES          = test_signal.cc $(sigc_test_util)
 test_signal_move_SOURCES     = test_signal_move.cc $(sigc_test_util)
 test_size_SOURCES            = test_size.cc $(sigc_test_util)
diff --git a/tests/test_rvalue_ref.cc b/tests/test_rvalue_ref.cc
index b35ace1..54b04f3 100644
--- a/tests/test_rvalue_ref.cc
+++ b/tests/test_rvalue_ref.cc
@@ -2,7 +2,9 @@
 #include <iostream>
 #include <sigc++/signal.h>
 
-struct MoveableStruct {};
+struct MoveableStruct
+{
+};
 
 namespace
 {
@@ -11,10 +13,7 @@ std::ostringstream result_stream;
 
 struct foo
 {
-  void operator()(MoveableStruct &&x)
-  {
-    result_stream << "foo(MoveableStruct&&)";
-  }
+  void operator()(MoveableStruct&& /* x */) { result_stream << "foo(MoveableStruct&&)"; }
 };
 
 } // end anonymous namespace
@@ -22,7 +21,7 @@ struct foo
 void
 test_signal()
 {
-  sigc::signal<void (MoveableStruct &&)> signal;
+  sigc::signal<void(MoveableStruct &&)> signal;
   foo f;
   signal.connect(f);
   MoveableStruct x;
@@ -33,7 +32,7 @@ test_signal()
 void
 test_slot()
 {
-  sigc::slot<void (MoveableStruct &&)> slot;
+  sigc::slot<void(MoveableStruct &&)> slot;
   foo f;
   slot = f;
   MoveableStruct x;