/* Copyright 2003 - 2016, The libsigc++ Development Team
 *  Assigned to public domain.  Use as you wish without restriction.
 */

#include <iostream>
#include <sigc++/signal.h>
#include <sigc++/functors/mem_fun.h>
#include <boost/timer/timer.hpp>

const int COUNT = 10000000;

struct foo : public sigc::trackable
{
  int bar(int a);
  int c;
};

int foo::bar(int a)
{
  int b = c;
  c = a;
  return b;
}

void test_slot_call()
{
  foo foobar1;

  // slot benchmark ...

  sigc::slot<int(int)> slot = sigc::mem_fun(foobar1, &foo::bar);

  std::cout << "elapsed time for calling a slot " << COUNT << " times:" << std::endl;
  boost::timer::auto_cpu_timer timer;

  for (int i=0; i < COUNT; ++i)
    slot(i);
}

void test_signal_emit()
{
  sigc::signal<int(int)> emitter;

  std::cout << "elapsed time for " << COUNT << " emissions (0 slots):" << std::endl;
  boost::timer::auto_cpu_timer timer;

  for (int i=0; i < COUNT; ++i)
    emitter(i);
}

void test_connected_signal_emit()
{
  foo foobar1;
  sigc::signal<int(int)> emitter;
  emitter.connect(mem_fun(foobar1, &foo::bar));

  std::cout << "elapsed time for " << COUNT << " emissions (1 slot):" << std::endl;
  boost::timer::auto_cpu_timer timer;

  for (int i=0; i < COUNT; ++i)
    emitter(i);
}

void test_connected_multiple_signal_emit()
{
  foo foobar1, foobar2, foobar3, foobar4, foobar5;

  sigc::signal<int(int)> emitter;
  emitter.connect(mem_fun(foobar2, &foo::bar));
  emitter.connect(mem_fun(foobar3, &foo::bar));
  emitter.connect(mem_fun(foobar4, &foo::bar));
  emitter.connect(mem_fun(foobar5, &foo::bar));

  std::cout << "elapsed time for " << COUNT << " emissions (5 slots):" << std::endl;
  boost::timer::auto_cpu_timer timer;;

  for (int i=0; i < COUNT; ++i)
    emitter(i);
}

void test_connect_disconnect()
{
  foo foobar1;
  sigc::signal<int(int)> emitter;
  sigc::connection conn;

  std::cout << "elapsed time for " << COUNT << " connections/disconnections:" << std::endl;
  boost::timer::auto_cpu_timer timer;

  for (int i=0; i < COUNT; ++i)
    {
      conn = emitter.connect(mem_fun(foobar1, &foo::bar));
      conn.disconnect();
    }
}

int main()
{
  // slot benchmark ...
  test_slot_call();

  // emission benchmark (zero slots) ...
  test_signal_emit();

  // emission benchmark (one slot) ...
  test_connected_signal_emit();

  // emission benchmark (five slot) ...
  test_connected_multiple_signal_emit();

  // connection / disconnection benchmark ...
  test_connect_disconnect();
}
