workaround limitations of moving std::function<void()>

test/testev.cpp

@@ -63,6 +63,29 @@ void test_call()
         testFail("Caught wrong exception : %s \"%s\"", typeid(e).name(), e.what());
     }
 
+    {
+        testDiag("Demonstrate exclusive ownership transfer");
+        bool called = false;
+        std::unique_ptr<int> ival{new int(42)};
+        base.call(std::bind([&called](std::unique_ptr<int>& ival) {
+                      auto trash(std::move(ival));
+                      called = true;
+                  }, std::move(ival)));
+        testTrue(called);
+    }
+
+    {
+        testDiag("Demonstrate shared ownership transfer");
+        bool called = false;
+        auto ival(std::make_shared<int>(42));
+        base.call(std::bind([&called](std::shared_ptr<int>& ival) {
+                      auto trash(std::move(ival));
+                      testEq(trash.use_count(), 1u);
+                      called = true;
+                  }, std::move(ival)));
+        testTrue(called);
+    }
+
     auto internal(base.internal());
     base = evbase();
     // loop stopped
@@ -124,7 +147,7 @@ void test_fill_evbuf()
 MAIN(testev)
 {
     SockAttach attach;
-    testPlan(17);
+    testPlan(20);
     testSetup();
     test_call();
     test_fill_evbuf();