boost_1_45_0/libs/signals2/test/track_test.cpp

// Boost.Signals library

// Copyright Douglas Gregor 2001-2006
// Copyright Frank Mori Hess 2007
// Use, modification and
// distribution is subject to 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)

// For more information, see http://www.boost.org

#include <memory>
#include <boost/optional.hpp>
#include <boost/ref.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/test/minimal.hpp>
#include <boost/signals2.hpp>
#include <boost/bind.hpp>

struct swallow {
  typedef int result_type;
  template<typename T> result_type operator()(const T*, int i) { return i; }
};

template<typename T>
struct max_or_default {
  typedef T result_type;

  template<typename InputIterator>
  T operator()(InputIterator first, InputIterator last) const
  {
    boost::optional<T> max;
    for(; first != last; ++first)
    {
      T value = *first;
      if(max == false)
      {
        max = value;
      }else if(value > *max)
      {
        max = value;
      }
    }
    if(max) return *max;
    else return T();
  }
};

static int myfunc(int i, double z)
{
  return i;
}

int test_main(int, char*[])
{
  typedef boost::signals2::signal<int (int), max_or_default<int> > sig_type;
  sig_type s1;
  boost::signals2::connection connection;

  // Test auto-disconnection
  BOOST_CHECK(s1(5) == 0);
  {
    boost::shared_ptr<int> shorty(new int());
    s1.connect(sig_type::slot_type(swallow(), shorty.get(), _1).track(shorty));
    BOOST_CHECK(s1(5) == 5);
  }
  BOOST_CHECK(s1(5) == 0);

  // Test auto-disconnection of slot before signal connection
  {
    boost::shared_ptr<int> shorty(new int(1));
// doesn't work on gcc 3.3.5, it says: error: type specifier omitted for parameter `shorty'
// does work on gcc 4.1.2
//    sig_type::slot_type slot(swallow(), shorty.get(), _1);
    swallow myswallow;
    sig_type::slot_type slot(myswallow, shorty.get(), _1);

    slot.track(shorty);
    shorty.reset();
    s1.connect(slot);
    BOOST_CHECK(s1(5) == 0);
  }

  // Test binding of a slot to another slot
  {
    boost::shared_ptr<int> shorty(new int(2));
    boost::signals2::slot<int (double)> other_slot(&myfunc, boost::cref(*shorty.get()), _1);
    other_slot.track(shorty);
    connection = s1.connect(sig_type::slot_type(other_slot, 0.5).track(other_slot));
    BOOST_CHECK(s1(3) == 2);
  }
  BOOST_CHECK(connection.connected() == false);
  BOOST_CHECK(s1(3) == 0);

  // Test binding of a signal as a slot
  {
    sig_type s2;
    s1.connect(s2);
    s2.connect(sig_type::slot_type(&myfunc, _1, 0.7));
    BOOST_CHECK(s1(4) == 4);
  }
  BOOST_CHECK(s1(4) == 0);

  // Test tracking of null but not empty shared_ptr
  BOOST_CHECK(s1(2) == 0);
  {
    boost::shared_ptr<int> shorty((int*)(0));
    s1.connect(sig_type::slot_type(swallow(), shorty.get(), _1).track(shorty));
    BOOST_CHECK(s1(2) == 2);
  }
  BOOST_CHECK(s1(2) == 0);

// there isn't a boost config macro that detects the existance of std::shared_ptr or std::weak_ptr,
// so we rely on BOOST_NO_VARIADIC_TEMPLATES as a hack
#ifndef BOOST_NO_VARIADIC_TEMPLATES
  // Test tracking through std::shared_ptr/weak_ptr
  BOOST_CHECK(s1(5) == 0);
  {
    std::shared_ptr<int> shorty(new int());
    s1.connect(sig_type::slot_type(swallow(), shorty.get(), _1).track_foreign(shorty));
    BOOST_CHECK(s1(5) == 5);
  }
  BOOST_CHECK(s1(5) == 0);
  {
    std::shared_ptr<int> shorty(new int());
    s1.connect
    (
      sig_type::slot_type
      (
        swallow(),
        shorty.get(),
        _1
      ).track_foreign
      (
        std::weak_ptr<int>(shorty)
      )
    );
    BOOST_CHECK(s1(5) == 5);
  }
  BOOST_CHECK(s1(5) == 0);
#endif

  return 0;
}