Add SigslotTester0 for testing signals without argument.

webrtc/base/sigslottester.h

 // This file was GENERATED by command:
 //     pump.py sigslottester.h.pump
 // DO NOT EDIT BY HAND!!!
 
 /*
  *  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
@@ skipping 26 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.
 
 template <class A1, class C1>
 class SigslotTester1 : public sigslot::has_slots<> {
  public:
   SigslotTester1(sigslot::signal1<A1>* signal,
                 C1* capture1)
@@ skipping 132 matching lines @@
   C2* capture2_;
   C3* capture3_;
   C4* capture4_;
   C5* capture5_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SigslotTester5);
 };
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_SIGSLOTTESTER_H_