libs/sigc++2/sigc++/signal_base.cc

   1 // -*- c++ -*-
   2 /*
   3  * Copyright 2003, The libsigc++ Development Team
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2.1 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  *
  19  */
  20 #include <sigc++/signal_base.h>
  21
  22 namespace sigc {
  23 namespace internal {
  24
  25 signal_impl::signal_impl()
  26 : ref_count_(0), exec_count_(0), deferred_(0)
  27 {}
  28
  29 // only MSVC needs this to guarantee that all new/delete are executed from the DLL module
  30 #ifdef SIGC_NEW_DELETE_IN_LIBRARY_ONLY
  31 void* signal_impl::operator new(size_t size_)
  32 {
  33   return malloc(size_);
  34 }
  35
  36 void signal_impl::operator delete(void* p)
  37 {
  38   free(p);
  39 }
  40 #endif
  41
  42 void signal_impl::clear()
  43 {
  44   slots_.clear();
  45 }
  46
  47 signal_impl::size_type signal_impl::size() const
  48 {
  49   return slots_.size();
  50 }
  51
  52 signal_impl::iterator_type signal_impl::connect(const slot_base& slot_)
  53 {
  54   return insert(slots_.end(), slot_);
  55 }
  56
  57 signal_impl::iterator_type signal_impl::erase(iterator_type i)
  58 {
  59   return slots_.erase(i);
  60 }
  61
  62 signal_impl::iterator_type signal_impl::insert(signal_impl::iterator_type i, const slot_base& slot_)
  63 {
  64   iterator_type temp = slots_.insert(i, slot_);
  65   temp->set_parent(this, &notify);
  66   return temp;
  67 }
  68
  69 void signal_impl::sweep()
  70 {
  71   deferred_ = false;
  72   iterator_type i = slots_.begin();
  73   while (i != slots_.end())
  74     if ((*i).empty())
  75       i = slots_.erase(i);
  76     else
  77       ++i;
  78 }
  79
  80 void* signal_impl::notify(void* d)
  81 {
  82   signal_impl* self = reinterpret_cast<signal_impl*>(d);
  83   if (self->exec_count_ == 0)
  84     self->sweep();
  85   else                       // This is occuring during signal emission.
  86     self->deferred_ = true;  // => sweep() will be called from ~signal_exec().
  87   return 0;                  // This is safer because we don't have to care about our iterators in emit().
  88 }
  89
  90 } /* namespace internal */
  91
  92 signal_base::signal_base()
  93 : impl_(0)
  94 {}
  95
  96 signal_base::signal_base(const signal_base& src)
  97 : trackable(),
  98   impl_(src.impl())
  99 {
 100   impl_->reference();
 101 }
 102
 103 signal_base::~signal_base()
 104 {
 105   if (impl_)
 106     impl_->unreference();
 107 }
 108
 109 void signal_base::clear()
 110 {
 111   if (impl_)
 112     impl_->clear();
 113 }
 114
 115 signal_base::size_type signal_base::size() const
 116 {
 117   return (impl_ ? impl_->size() : 0);
 118 }
 119
 120 signal_base::iterator_type signal_base::connect(const slot_base& slot_)
 121 {
 122   return impl()->connect(slot_);
 123 }
 124
 125 signal_base::iterator_type signal_base::insert(iterator_type i, const slot_base& slot_)
 126 {
 127   return impl()->insert(i, slot_);
 128 }
 129
 130 signal_base::iterator_type signal_base::erase(iterator_type i)
 131 {
 132   return impl()->erase(i);
 133 }
 134
 135 signal_base& signal_base::operator = (const signal_base& src)
 136 {
 137   if (impl_) impl_->unreference();
 138   impl_ = src.impl();
 139   impl_->reference();
 140   return *this;
 141 }
 142
 143 internal::signal_impl* signal_base::impl() const
 144 {
 145   if (!impl_) {
 146     impl_ = new internal::signal_impl;
 147     impl_->reference();  // start with a reference count of 1
 148   }
 149   return impl_;
 150 }
 151
 152 } /* sigc */