Add SigslotTester0 for testing signals without argument.

webrtc/base/sigslottester.h.pump

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 22 matching lines @@
 //   foo.emit("hello");
 //   EXPECT_EQ(1, slot.callback_count());
 //   EXPECT_EQ("hello", capture);
 //   /* See unit-tests for more examples */
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/sigslot.h"
 
 namespace rtc {
 
-// For all the templates below:
+// Base version for testing signals that passes no arguments.
+class SigslotTester0 : public sigslot::has_slots<> {
+ public:
+  explicit SigslotTester0(sigslot::signal0<>* signal) : callback_count_(0) {
+    signal->connect(this, &SigslotTester0::OnSignalCallback);
+  }
+
+  int callback_count() const { return callback_count_; }
+
+ private:
+  void OnSignalCallback() { callback_count_++; }
+  int callback_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(SigslotTester0);
+};
+
+// Versions below are for testing signals that pass arguments. For all the
+// templates below:
 // - A1-A5 is the type of the argument i in the callback. Signals may and often
 //   do use const-references here for efficiency.
 // - C1-C5 is the type of the variable to capture argument i. These should be
 //   non-const value types suitable for use as lvalues.
 
 $var n = 5
 $range i 1..n
 $for i [[
 $range j 1..i
 
@@ skipping 22 matching lines @@
   C$j* capture$j[[]]_;]]
 
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SigslotTester$i);
 };
 
 ]]
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_SIGSLOTTESTER_H_