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source: downloads/boost_1_33_1/boost/signals/signal_template.hpp @ 18

Last change on this file since 18 was 12, checked in by landauf, 17 years ago

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1// Boost.Signals library
2
3// Copyright Douglas Gregor 2001-2004. Use, modification and
4// distribution is subject to the Boost Software License, Version
5// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6// http://www.boost.org/LICENSE_1_0.txt)
7
8// For more information, see http://www.boost.org
9
10// This file intentionally does not have include guards, because it is meant
11// to be included multiple times (one for each signalN class). The
12// BOOST_SIGNALS_SIGNAL_TEMPLATE_HEADER_INCLUDED macro merely serves to
13// suppress reinclusion of the files that this header depends on.
14
15#ifndef BOOST_SIGNALS_SIGNAL_TEMPLATE_HEADER_INCLUDED
16#define BOOST_SIGNALS_SIGNAL_TEMPLATE_HEADER_INCLUDED
17#  include <boost/config.hpp>
18#  include <boost/signals/connection.hpp>
19#  include <boost/utility.hpp>
20#  include <boost/ref.hpp>
21#  include <boost/signals/slot.hpp>
22#  include <boost/last_value.hpp>
23#  include <boost/signals/detail/signal_base.hpp>
24#  include <boost/signals/detail/slot_call_iterator.hpp>
25#  include <boost/mpl/bool.hpp>
26#  include <boost/type_traits/is_convertible.hpp>
27#  include <cassert>
28#  include <functional>
29#  include <memory>
30#endif // !BOOST_SIGNALS_SIGNAL_TEMPLATE_HEADER_INCLUDED
31
32#ifdef BOOST_HAS_ABI_HEADERS
33#  include BOOST_ABI_PREFIX
34#endif
35
36// Include the appropriate functionN header
37#define BOOST_SIGNAL_FUNCTION_N_HEADER BOOST_JOIN(<boost/function/function,BOOST_SIGNALS_NUM_ARGS.hpp>)
38#include BOOST_SIGNAL_FUNCTION_N_HEADER
39
40// Determine if a comma should follow a listing of the arguments/parameters
41#if BOOST_SIGNALS_NUM_ARGS == 0
42#  define BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
43#else
44#  define BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS ,
45#endif // BOOST_SIGNALS_NUM_ARGS > 0
46
47// Define class names used
48#define BOOST_SIGNALS_SIGNAL BOOST_JOIN(signal,BOOST_SIGNALS_NUM_ARGS)
49#define BOOST_SIGNALS_FUNCTION BOOST_JOIN(function,BOOST_SIGNALS_NUM_ARGS)
50#define BOOST_SIGNALS_ARGS_STRUCT BOOST_JOIN(args,BOOST_SIGNALS_NUM_ARGS)
51#define BOOST_SIGNALS_CALL_BOUND BOOST_JOIN(call_bound,BOOST_SIGNALS_NUM_ARGS)
52
53// Define commonly-used instantiations
54#define BOOST_SIGNALS_ARGS_STRUCT_INST \
55  BOOST_SIGNALS_NAMESPACE::detail::BOOST_SIGNALS_ARGS_STRUCT<BOOST_SIGNALS_TEMPLATE_ARGS>
56
57namespace boost {
58  namespace BOOST_SIGNALS_NAMESPACE {
59    namespace detail {
60      // Holds the arguments for a bound slot call in a single place
61      template<BOOST_SIGNALS_TEMPLATE_PARMS
62               BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
63               typename Dummy = int>
64      struct BOOST_SIGNALS_ARGS_STRUCT {
65        BOOST_SIGNALS_ARGS_STRUCT(BOOST_SIGNALS_COPY_PARMS)
66          BOOST_SIGNALS_INIT_ARGS
67        {
68        }
69
70        BOOST_SIGNALS_ARGS_AS_MEMBERS
71      };
72
73      // Function object that calls the function object given to it, passing
74      // the bound arguments along to that underlying function object
75      template<typename R>
76      struct BOOST_SIGNALS_CALL_BOUND {
77        template<BOOST_SIGNALS_TEMPLATE_PARMS
78                 BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
79                 typename F>
80        struct caller {
81          typedef BOOST_SIGNALS_ARGS_STRUCT<BOOST_SIGNALS_TEMPLATE_ARGS>*
82            args_type;
83
84          args_type args;
85
86          typedef R result_type;
87
88          caller() {}
89          caller(args_type a) : args(a) {}
90
91          template<typename Pair>
92          R operator()(const Pair& slot) const
93          {
94            F* target = const_cast<F*>(unsafe_any_cast<F>(&slot.second));
95            return (*target)(BOOST_SIGNALS_BOUND_ARGS);
96          }
97        };
98      };
99
100      template<>
101      struct BOOST_SIGNALS_CALL_BOUND<void> {
102        template<BOOST_SIGNALS_TEMPLATE_PARMS
103                 BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
104                 typename F>
105        struct caller {
106          typedef BOOST_SIGNALS_ARGS_STRUCT<BOOST_SIGNALS_TEMPLATE_ARGS>*
107            args_type;
108
109          args_type args;
110
111          typedef unusable result_type;
112
113          caller(args_type a) : args(a) {}
114
115          template<typename Pair>
116          unusable operator()(const Pair& slot) const
117          {
118            F* target = const_cast<F*>(unsafe_any_cast<F>(&slot.second));
119            (*target)(BOOST_SIGNALS_BOUND_ARGS);
120            return unusable();
121          }
122        };
123      };
124    } // namespace detail
125  } // namespace BOOST_SIGNALS_NAMESPACE
126
127  // The actual signalN class
128  template<
129    typename R,
130    BOOST_SIGNALS_TEMPLATE_PARMS
131    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
132    typename Combiner = last_value<R>,
133    typename Group = int,
134    typename GroupCompare = std::less<Group>,
135    typename SlotFunction = BOOST_SIGNALS_FUNCTION<
136                              R BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
137                              BOOST_SIGNALS_TEMPLATE_ARGS>
138  >
139  class BOOST_SIGNALS_SIGNAL :
140    public BOOST_SIGNALS_NAMESPACE::detail::signal_base, // management of slot list
141    public BOOST_SIGNALS_NAMESPACE::trackable // signals are trackable
142  {
143  public:
144    // The slot function type
145    typedef SlotFunction slot_function_type;
146
147    // Result type of a slot
148    typedef typename BOOST_SIGNALS_NAMESPACE::detail::slot_result_type<R>::type
149      slot_result_type;
150
151    // Argument types
152    BOOST_SIGNALS_ARG_TYPES
153
154#if BOOST_SIGNALS_NUM_ARGS == 1
155    typedef T1 argument_type;
156#elif BOOST_SIGNALS_NUM_ARGS == 2
157    typedef T1 first_argument_type;
158    typedef T2 second_argument_type;
159#endif
160
161  private:
162    // The real slot name comparison object type
163    typedef BOOST_SIGNALS_NAMESPACE::detail::group_bridge_compare<GroupCompare, Group>
164      real_group_compare_type;
165
166    // The function object passed to the slot call iterator that will call
167    // the underlying slot function with its arguments bound
168    typedef BOOST_SIGNALS_NAMESPACE::detail::BOOST_SIGNALS_CALL_BOUND<R>
169      outer_bound_slot_caller;
170    typedef typename outer_bound_slot_caller::template
171              caller<BOOST_SIGNALS_TEMPLATE_ARGS
172                     BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
173                     slot_function_type>
174      call_bound_slot;
175
176  public:
177    // Combiner's result type
178    typedef typename Combiner::result_type result_type;
179
180    // Combiner type
181    typedef Combiner combiner_type;
182
183    // Slot type
184    typedef slot<slot_function_type> slot_type;
185
186    // Slot name type and comparison
187    typedef Group group_type;
188    typedef GroupCompare group_compare_type;
189
190    typedef BOOST_SIGNALS_NAMESPACE::detail::slot_call_iterator<
191              call_bound_slot, iterator> slot_call_iterator;
192
193    explicit
194    BOOST_SIGNALS_SIGNAL(const Combiner& c = Combiner(),
195                         const GroupCompare& comp = GroupCompare()) :
196      BOOST_SIGNALS_NAMESPACE::detail::signal_base(real_group_compare_type(comp),
197                                                   c)
198    {
199    }
200
201    // Connect a slot to this signal
202    BOOST_SIGNALS_NAMESPACE::connection
203    connect(const slot_type&,
204            BOOST_SIGNALS_NAMESPACE::connect_position at
205              = BOOST_SIGNALS_NAMESPACE::at_back);
206
207
208    BOOST_SIGNALS_NAMESPACE::connection
209    connect(const group_type&, const slot_type&,
210            BOOST_SIGNALS_NAMESPACE::connect_position at
211              = BOOST_SIGNALS_NAMESPACE::at_back);
212
213#if BOOST_WORKAROUND(BOOST_MSVC, <= 0x1700)
214    // MSVC 6.0 and 7.0 don't handle the is_convertible test well
215    void disconnect(const group_type& group)
216    {
217      impl->disconnect(group);
218    }
219#else
220    template<typename T>
221    void disconnect(const T& t)
222    {
223      typedef mpl::bool_<(is_convertible<T, group_type>::value)> is_group;
224      this->do_disconnect(t, is_group());
225    }
226
227  private:
228    // Disconnect a named slot
229    void do_disconnect(const group_type& group, mpl::bool_<true>)
230    {
231      impl->disconnect(group);
232    }
233
234    template<typename Function>
235    void do_disconnect(const Function& f, mpl::bool_<false>)
236    {
237      // Notify the slot handling code that we are iterating through the slots
238      BOOST_SIGNALS_NAMESPACE::detail::call_notification notification(this->impl);
239
240      for (iterator i = impl->slots_.begin(); i != impl->slots_.end(); ++i) {
241        slot_function_type& s = *unsafe_any_cast<slot_function_type>(&i->second);
242        if (s == f) i->first.disconnect();
243      }
244    }
245#endif
246
247  public:
248
249    // Emit the signal
250    result_type operator()(BOOST_SIGNALS_PARMS);
251    result_type operator()(BOOST_SIGNALS_PARMS) const;
252
253    Combiner& combiner()
254    { return *unsafe_any_cast<Combiner>(&impl->combiner_); }
255
256    const Combiner& combiner() const
257    { return *unsafe_any_cast<const Combiner>(&impl->combiner_); }
258  };
259
260  template<
261    typename R,
262    BOOST_SIGNALS_TEMPLATE_PARMS
263    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
264    typename Combiner,
265    typename Group,
266    typename GroupCompare,
267    typename SlotFunction
268  >
269  BOOST_SIGNALS_NAMESPACE::connection
270  BOOST_SIGNALS_SIGNAL<
271    R, BOOST_SIGNALS_TEMPLATE_ARGS
272    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
273    Combiner, Group, GroupCompare, SlotFunction
274  >::connect(const slot_type& in_slot,
275             BOOST_SIGNALS_NAMESPACE::connect_position at)
276  {
277    using boost::BOOST_SIGNALS_NAMESPACE::detail::stored_group;
278
279    // If the slot has been disconnected, just return a disconnected
280    // connection
281    if (!in_slot.is_active()) {
282      return BOOST_SIGNALS_NAMESPACE::connection();
283    }
284
285    return impl->connect_slot(in_slot.get_slot_function(), stored_group(),
286                              in_slot.get_data(), at);
287  }
288
289  template<
290    typename R,
291    BOOST_SIGNALS_TEMPLATE_PARMS
292    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
293    typename Combiner,
294    typename Group,
295    typename GroupCompare,
296    typename SlotFunction
297  >
298  BOOST_SIGNALS_NAMESPACE::connection
299  BOOST_SIGNALS_SIGNAL<
300    R, BOOST_SIGNALS_TEMPLATE_ARGS
301    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
302    Combiner, Group, GroupCompare, SlotFunction
303  >::connect(const group_type& group,
304             const slot_type& in_slot,
305             BOOST_SIGNALS_NAMESPACE::connect_position at)
306  {
307    // If the slot has been disconnected, just return a disconnected
308    // connection
309    if (!in_slot.is_active()) {
310      return BOOST_SIGNALS_NAMESPACE::connection();
311    }
312
313    return impl->connect_slot(in_slot.get_slot_function(), group,
314                              in_slot.get_data(), at);
315  }
316
317  template<
318    typename R,
319    BOOST_SIGNALS_TEMPLATE_PARMS
320    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
321    typename Combiner,
322    typename Group,
323    typename GroupCompare,
324    typename SlotFunction
325  >
326  typename BOOST_SIGNALS_SIGNAL<
327             R, BOOST_SIGNALS_TEMPLATE_ARGS
328             BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
329             Combiner, Group, GroupCompare, SlotFunction>::result_type
330  BOOST_SIGNALS_SIGNAL<
331    R, BOOST_SIGNALS_TEMPLATE_ARGS
332    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
333    Combiner, Group, GroupCompare, SlotFunction
334  >::operator()(BOOST_SIGNALS_PARMS)
335  {
336    // Notify the slot handling code that we are making a call
337    BOOST_SIGNALS_NAMESPACE::detail::call_notification notification(this->impl);
338
339    // Construct a function object that will call the underlying slots
340    // with the given arguments.
341#if BOOST_SIGNALS_NUM_ARGS == 0
342    BOOST_SIGNALS_ARGS_STRUCT_INST args;
343#else
344    BOOST_SIGNALS_ARGS_STRUCT_INST args(BOOST_SIGNALS_ARGS);
345#endif // BOOST_SIGNALS_NUM_ARGS > 0
346    call_bound_slot f(&args);
347
348    typedef typename call_bound_slot::result_type result_type;
349    optional<result_type> cache;
350    // Let the combiner call the slots via a pair of input iterators
351    return combiner()(slot_call_iterator(notification.impl->slots_.begin(),
352                                         impl->slots_.end(), f, cache),
353                      slot_call_iterator(notification.impl->slots_.end(),
354                                         impl->slots_.end(), f, cache));
355  }
356
357  template<
358    typename R,
359    BOOST_SIGNALS_TEMPLATE_PARMS
360    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
361    typename Combiner,
362    typename Group,
363    typename GroupCompare,
364    typename SlotFunction
365  >
366  typename BOOST_SIGNALS_SIGNAL<
367             R, BOOST_SIGNALS_TEMPLATE_ARGS
368             BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
369             Combiner, Group, GroupCompare, SlotFunction>::result_type
370  BOOST_SIGNALS_SIGNAL<
371    R, BOOST_SIGNALS_TEMPLATE_ARGS
372    BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
373    Combiner, Group, GroupCompare, SlotFunction
374  >::operator()(BOOST_SIGNALS_PARMS) const
375  {
376    // Notify the slot handling code that we are making a call
377    BOOST_SIGNALS_NAMESPACE::detail::call_notification notification(this->impl);
378
379    // Construct a function object that will call the underlying slots
380    // with the given arguments.
381#if BOOST_SIGNALS_NUM_ARGS == 0
382    BOOST_SIGNALS_ARGS_STRUCT_INST args;
383#else
384    BOOST_SIGNALS_ARGS_STRUCT_INST args(BOOST_SIGNALS_ARGS);
385#endif // BOOST_SIGNALS_NUM_ARGS > 0
386
387    call_bound_slot f(&args);
388
389    typedef typename call_bound_slot::result_type result_type;
390    optional<result_type> cache;
391
392    // Let the combiner call the slots via a pair of input iterators
393    return combiner()(slot_call_iterator(notification.impl->slots_.begin(),
394                                         impl->slots_.end(), f, cache),
395                      slot_call_iterator(notification.impl->slots_.end(),
396                                         impl->slots_.end(), f, cache));
397  }
398} // namespace boost
399
400#undef BOOST_SIGNAL_FUNCTION_N_HEADER
401#undef BOOST_SIGNALS_ARGS_STRUCT_INST
402#undef BOOST_SIGNALS_CALL_BOUND
403#undef BOOST_SIGNALS_ARGS_STRUCT
404#undef BOOST_SIGNALS_FUNCTION
405#undef BOOST_SIGNALS_SIGNAL
406#undef BOOST_SIGNALS_COMMA_IF_NONZERO_ARGS
407
408#ifdef BOOST_HAS_ABI_HEADERS
409#  include BOOST_ABI_SUFFIX
410#endif
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