connect_test.cpp
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1 /*
2  * Copyright (c) 2011, Willow Garage, Inc.
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29 
30 #include <stdio.h>
31 #include <chrono>
32 
33 // This is a simple speed test to compare suppressing a signal/slot
34 // emission by one of two methods:
35 //
36 // 1) disconnect and reconnect the signal/slot.
37 //
38 // 2) define a bool suppress_ member which makes the slot do nothing.
39 //
40 // Results for Qt 4.6 are that disconnect/reconnect takes about 11
41 // times as long as boolean suppressor.
42 
43 #include "connect_test.h"
44 
45 int main(int /*argc*/, char** /*argv*/)
46 {
47  MyObject* obj = new MyObject;
48  obj->enableChanges();
49 
50  QObject::connect(obj, SIGNAL(changed()), obj, SLOT(onChanged()));
51  obj->emitChanged();
52 
53  int count = 1000000;
54 
55  auto start = std::chrono::steady_clock::now();
56  for (int i = 0; i < count; i++)
57  {
58  QObject::disconnect(obj, SIGNAL(changed()), obj, SLOT(onChanged()));
59  obj->emitChanged();
60  QObject::connect(obj, SIGNAL(changed()), obj, SLOT(onChanged()));
61  }
62  auto end = std::chrono::steady_clock::now();
63  printf("disconnect/emit/connect %d times took %lf seconds.\n", count,
64  std::chrono::duration<double>(end - start).count());
65 
66  obj->emitChanged();
67 
68  start = std::chrono::steady_clock::now();
69  for (int i = 0; i < count; i++)
70  {
71  obj->suppressChanges();
72  obj->emitChanged();
73  obj->enableChanges();
74  }
75  end = std::chrono::steady_clock::now();
76  printf("suppress/emit/enable %d times took %lf seconds.\n", count,
77  std::chrono::duration<double>(end - start).count());
78 
79  return 0;
80 }
int main(int, char **)
ROSCPP_DECL void start()
void emitChanged()
Definition: connect_test.h:50
void enableChanges()
Definition: connect_test.h:46
void suppressChanges()
Definition: connect_test.h:42


rviz
Author(s): Dave Hershberger, David Gossow, Josh Faust
autogenerated on Fri Aug 12 2022 02:06:08