connect_test.cpp
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1 /*
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29 
30 #include <stdio.h>
31 #include <sys/time.h>
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 double now()
46 {
47  struct timeval tv;
48  gettimeofday( &tv, NULL );
49  return double(tv.tv_sec) + double(tv.tv_usec) / 1000000.0;
50 }
51 
52 int main( int argc, char **argv )
53 {
54  MyObject* obj = new MyObject;
55  obj->enableChanges();
56 
57  QObject::connect( obj, SIGNAL( changed() ), obj, SLOT( onChanged() ));
58  obj->emitChanged();
59 
60  double start, end;
61  int count = 1000000;
62 
63  start = now();
64  for( int i = 0; i < count; i++ )
65  {
66  QObject::disconnect( obj, SIGNAL( changed() ), obj, SLOT( onChanged() ));
67  obj->emitChanged();
68  QObject::connect( obj, SIGNAL( changed() ), obj, SLOT( onChanged() ));
69  }
70  end = now();
71  printf("disconnect/emit/connect %d times took %lf seconds.\n", count, end - start );
72 
73  obj->emitChanged();
74 
75  start = now();
76  for( int i = 0; i < count; i++ )
77  {
78  obj->suppressChanges();
79  obj->emitChanged();
80  obj->enableChanges();
81  }
82  end = now();
83  printf("suppress/emit/enable %d times took %lf seconds.\n", count, end - start );
84 
85  return 0;
86 }
#define NULL
Definition: global.h:37
double now()
void emitChanged()
Definition: connect_test.h:44
void enableChanges()
Definition: connect_test.h:43
void suppressChanges()
Definition: connect_test.h:42
int main(int argc, char **argv)


rviz
Author(s): Dave Hershberger, David Gossow, Josh Faust
autogenerated on Sat Apr 27 2019 02:33:41