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Fast C++ Delegate: Boost.Function 'drop-in' replacement and multicast

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1 Jun 200733 min read 292.4K   1.9K   110  
An article on the implementation of a fast C++ delegate with many advanced features.
 
// FD.Delegate library

//  Copyright (c) 2007 JaeWook Choi
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/test/minimal.hpp>
#include <cassert>
#include <iostream>
#include <typeinfo>
#include <fd/delegate.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/ref.hpp>

struct foobar
{
  int foo(long, int) { return 0; }
  int bar(long, int) const { return 0; }
  static double hello(char *, unsigned) { return 0.0; }

  long operator ()(int, int) { return 0; }
  float operator ()(void *) const { return 0.0f; }
};

void hello_foobar(int, long) { }

int
test_main(int, char*[])
{
  std::cout << "01.function #1" << std::endl;
  fd::delegate2<void, long, int> dg1( &hello_foobar );
  std::cout << dg1.type().name() << std::endl;
  std::cout << typeid( &hello_foobar ).name() << std::endl;
  BOOST_CHECK(dg1.type() == typeid( &hello_foobar ));

  std::cout << "02.function #2" << std::endl;
  fd::delegate2<void, int, long> dg2( &hello_foobar );
  std::cout << dg2.type().name() << std::endl;
  std::cout << typeid( &hello_foobar ).name() << std::endl;
  BOOST_CHECK(dg2.type() == typeid( &hello_foobar ));

  std::cout << "03.static member function" << std::endl;
  fd::delegate2<double, char *, unsigned> dg3( &foobar::hello );
  std::cout << dg3.type().name() << std::endl;
  std::cout << typeid( &foobar::hello ).name() << std::endl;
  BOOST_CHECK(dg3.type() == typeid( &foobar::hello ));

  std::cout << "04.member function #1" << std::endl;
  fd::delegate3<int, foobar *, long, int> dg11(&foobar::foo);
  std::cout << dg11.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg11.type() == typeid( &foobar::foo ));

  std::cout << "05.member function #2" << std::endl;
  fd::delegate3<int, foobar &, long, int> dg12(&foobar::foo);
  std::cout << dg12.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg12.type() == typeid( &foobar::foo ));

  std::cout << "06.member function #3" << std::endl;
  fd::delegate3<int, foobar, long, int> dg13(&foobar::foo);
  std::cout << dg13.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg13.type() == typeid( &foobar::foo ));

  std::cout << "07.member function #4" << std::endl;
  fd::delegate3<int, boost::shared_ptr<foobar>, long, int> dg14(&foobar::foo);
  std::cout << dg14.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg14.type() == typeid( &foobar::foo ));

  std::cout << "08.member function #5" << std::endl;
  fd::delegate3<int, boost::shared_ptr<foobar>, long, int> dg15(&foobar::foo);
  std::cout << dg15.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg15.type() == typeid( &foobar::foo ));

  std::cout << "09.const member function #1" << std::endl;
  fd::delegate3<int, foobar *, long, int> dg21(&foobar::bar);
  std::cout << dg21.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg21.type() == typeid( &foobar::bar ));

  std::cout << "10.const member function #2" << std::endl;
  fd::delegate3<int, foobar const *, long, int> dg22(&foobar::bar);
  std::cout << dg22.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg22.type() == typeid( &foobar::bar ));

  std::cout << "11.const member function #3" << std::endl;
  fd::delegate3<int, foobar &, long, int> dg23(&foobar::bar);
  std::cout << dg23.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg23.type() == typeid( &foobar::bar ));

  std::cout << "12.const member function #4" << std::endl;
  fd::delegate3<int, foobar const &, long, int> dg24(&foobar::bar);
  std::cout << dg24.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg24.type() == typeid( &foobar::bar ));

  std::cout << "13.const member function #5" << std::endl;
  fd::delegate3<int, foobar, long, int> dg25(&foobar::bar);
  std::cout << dg25.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg25.type() == typeid( &foobar::bar ));

  std::cout << "14.const member function #6" << std::endl;
  fd::delegate3<int, foobar const, long, int> dg26(&foobar::bar);
  std::cout << dg26.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg26.type() == typeid( &foobar::bar ));

  std::cout << "15.const member function #7" << std::endl;
  fd::delegate3<int, boost::shared_ptr<foobar>, long, int> dg27(&foobar::bar);
  std::cout << dg27.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg27.type() == typeid( &foobar::bar ));

  foobar fb;
  foobar const cfb = fb;
  boost::shared_ptr<foobar> spfb(new foobar);

  std::cout << "16.member function bind #1" << std::endl;
  fd::delegate2<int, long, int> dg31(&foobar::foo, &fb);
  std::cout << dg31.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg31.type() == typeid( &foobar::foo));

  std::cout << "17.member function bind #2" << std::endl;
  fd::delegate2<int, long, int> dg32(&foobar::foo, boost::ref(fb));
  std::cout << dg32.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg32.type() == typeid( &foobar::foo));

  std::cout << "18.member function bind #3" << std::endl;
  fd::delegate2<int, long, int> dg33(&foobar::foo, fb);
  std::cout << dg33.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg33.type() == typeid( &foobar::foo));

  std::cout << "19.member function bind #4" << std::endl;
  fd::delegate2<int, long, int> dg34(&foobar::foo, cfb);
  std::cout << dg34.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg34.type() == typeid( &foobar::foo));

  std::cout << "20.member function bind #5" << std::endl;
  fd::delegate2<int, long, int> dg35(&foobar::foo, spfb);
  std::cout << dg35.type().name() << std::endl;
  std::cout << typeid( &foobar::foo ).name() << std::endl;
  BOOST_CHECK(dg35.type() == typeid( &foobar::foo));

  std::cout << "21.const member function bind #1" << std::endl;
  fd::delegate2<int, long, int> dg41(&foobar::bar, &fb);
  std::cout << dg41.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg41.type() == typeid( &foobar::bar));

  std::cout << "22.const member function bind #2" << std::endl;
  fd::delegate2<int, long, int> dg42(&foobar::bar, &cfb);
  std::cout << dg42.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg42.type() == typeid( &foobar::bar));

  std::cout << "23.const member function bind #3" << std::endl;
  fd::delegate2<int, long, int> dg43(&foobar::bar, boost::ref(fb));
  std::cout << dg43.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg43.type() == typeid( &foobar::bar));

  std::cout << "24.const member function bind #4" << std::endl;
  fd::delegate2<int, long, int> dg44(&foobar::bar, boost::cref(cfb));
  std::cout << dg44.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg44.type() == typeid( &foobar::bar));

  std::cout << "25.const member function bind #5" << std::endl;
  fd::delegate2<int, long, int> dg45(&foobar::bar, fb);
  std::cout << dg45.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg45.type() == typeid( &foobar::bar));

  std::cout << "26.const member function bind #6" << std::endl;
  fd::delegate2<int, long, int> dg46(&foobar::bar, cfb);
  std::cout << dg46.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg46.type() == typeid( &foobar::bar));

  std::cout << "27.const member function bind #7" << std::endl;
  fd::delegate2<int, long, int> dg47(&foobar::bar, spfb);
  std::cout << dg47.type().name() << std::endl;
  std::cout << typeid( &foobar::bar ).name() << std::endl;
  BOOST_CHECK(dg47.type() == typeid( &foobar::bar));

  std::cout << "28.function object #1" << std::endl;
  fd::delegate2<long, int, int> dg51(&fb);
  std::cout << dg51.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg51.type() == typeid( foobar ));

  std::cout << "29.function object #2" << std::endl;
  fd::delegate2<long, int, int> dg52(boost::ref(fb));
  std::cout << dg52.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg52.type() == typeid( foobar ));

  std::cout << "30.function object #3" << std::endl;
  fd::delegate2<long, int, int> dg53(fb);
  std::cout << dg53.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg53.type() == typeid( foobar ));

  std::cout << "31.function object #4" << std::endl;
  fd::delegate2<long, int, int> dg54(cfb);
  std::cout << dg54.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg54.type() == typeid( foobar ));

  /*
  std::cout << "32.function object #5" << std::endl;
  fd::delegate2<long, int, int> dg55(spfb);
  std::cout << dg55.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg55.type() == typeid( foobar ));
  */

  std::cout << "33.const function object #1" << std::endl;
  fd::delegate1<float, void *> dg61(&fb);
  std::cout << dg61.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg61.type() == typeid( foobar ));

  std::cout << "34.const function object #2" << std::endl;
  fd::delegate1<float, void *> dg62(&cfb);
  std::cout << dg62.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg62.type() == typeid( foobar ));

  std::cout << "35.const function object #3" << std::endl;
  fd::delegate1<float, void *> dg63(boost::ref(fb));
  std::cout << dg63.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg63.type() == typeid( foobar ));

  std::cout << "36.const function object #4" << std::endl;
  fd::delegate1<float, void *> dg64(boost::cref(cfb));
  std::cout << dg64.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg64.type() == typeid( foobar ));

  std::cout << "37.const function object #5" << std::endl;
  fd::delegate1<float, void *> dg65(fb);
  std::cout << dg65.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg65.type() == typeid( foobar ));

  std::cout << "38.const function object #6" << std::endl;
  fd::delegate1<float, void *> dg66(cfb);
  std::cout << dg66.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg66.type() == typeid( foobar ));

  /*
  std::cout << "39.const function object #7" << std::endl;
  fd::delegate1<float, void *> dg67(spfb);
  std::cout << dg67.type().name() << std::endl;
  std::cout << typeid( foobar ).name() << std::endl;
  BOOST_CHECK(dg67.type() == typeid( foobar ));
  */

  return 0;
}

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Written By
JaeWook Choi
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Canada Canada
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Posted 12 Apr 2007

Article Copyright 2007 by JaeWook Choi
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