/*
 *  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.
 */

#ifndef RTC_BASE_SIGSLOTTESTER_H_
#define RTC_BASE_SIGSLOTTESTER_H_

// To generate sigslottester.h from sigslottester.h.pump, execute:
// /home/build/google3/third_party/gtest/scripts/pump.py sigslottester.h.pump


// SigslotTester(s) are utility classes to check if signals owned by an
// object are being invoked at the right time and with the right arguments.
// They are meant to be used in tests. Tests must provide "capture" pointers
// (i.e. address of variables) where the arguments from the signal callback
// can be stored.
//
// Example:
//   /* Some signal */
//   sigslot::signal1<const std::string&> foo;
//
//   /* We want to monitor foo in some test. Note how signal argument is
//      const std::string&, but capture-type is std::string. Capture type
//      must be type that can be assigned to. */
//   std::string capture;
//   SigslotTester1<const std::string&, std::string> slot(&foo, &capture);
//   foo.emit("hello");
//   EXPECT_EQ(1, slot.callback_count());
//   EXPECT_EQ("hello", capture);
//   /* See unit-tests for more examples */

#include "rtc_base/third_party/sigslot/sigslot.h"

namespace rtc {

// 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);
  }

  SigslotTester0(const SigslotTester0&) = delete;
  SigslotTester0& operator=(const SigslotTester0&) = delete;

  int callback_count() const { return callback_count_; }

 private:
  void OnSignalCallback() { callback_count_++; }
  int callback_count_;
};

// 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

template <$for j , [[class A$j]], $for j , [[class C$j]]>
class SigslotTester$i : public sigslot::has_slots<> {
 public:
  SigslotTester$i(sigslot::signal$i<$for j , [[A$j]]>* signal,
                $for j , [[C$j* capture$j]])
      : callback_count_(0),
      $for j , [[capture$j[[]]_(capture$j)]] {
    signal->connect(this, &SigslotTester$i::OnSignalCallback);
  }

  SigslotTester$i(const SigslotTester$i&) = delete;
  SigslotTester$i& operator=(const SigslotTester$i&) = delete;

  int callback_count() const { return callback_count_; }

 private:
  void OnSignalCallback($for j , [[A$j arg$j]]) {
    callback_count_++;$for j [[

    *capture$j[[]]_ = arg$j;]]

  }

  int callback_count_;$for j [[

  C$j* capture$j[[]]_;]]
};

]]
}  // namespace rtc

#endif  // RTC_BASE_SIGSLOTTESTER_H_