base/sigslottester.h.pump

/*
 * libjingle
 * Copyright 2014 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 */

#ifndef TALK_BASE_SIGSLOTTESTER_H_
#define TALK_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 "talk/base/constructormagic.h"
#include "talk/base/sigslot.h"

namespace talk_base {

// 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);
  }

  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[[]]_;]]


  DISALLOW_COPY_AND_ASSIGN(SigslotTester$i);
};

]]
}  // namespace talk_base

#endif  // TALK_BASE_SIGSLOTTESTER_H_