1 files changed, 151 insertions, 0 deletions
diff --git a/libs/sigc++2/sigc++/signal_base.cc b/libs/sigc++2/sigc++/signal_base.cc
new file mode 100644
index 0000000000..568cf061c8
--- /dev/null
+++ b/libs/sigc++2/sigc++/signal_base.cc
@@ -0,0 +1,151 @@
+// -*- c++ -*-
+/*
+ * Copyright 2003, The libsigc++ Development Team
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <sigc++/signal_base.h>
+
+namespace sigc {
+namespace internal {
+
+signal_impl::signal_impl()
+: ref_count_(0), exec_count_(0), deferred_(0)
+{}
+
+// only MSVC needs this to guarantee that all new/delete are executed from the DLL module
+#ifdef SIGC_NEW_DELETE_IN_LIBRARY_ONLY
+void* signal_impl::operator new(size_t size_)
+{
+  return malloc(size_);
+}
+
+void signal_impl::operator delete(void* p)
+{
+  free(p);
+}
+#endif
+
+void signal_impl::clear()
+{
+  slots_.clear();
+}
+
+signal_impl::size_type signal_impl::size() const
+{
+  return slots_.size();
+}
+
+signal_impl::iterator_type signal_impl::connect(const slot_base& slot_)
+{
+  return insert(slots_.end(), slot_);
+}
+
+signal_impl::iterator_type signal_impl::erase(iterator_type i)
+{
+  return slots_.erase(i);
+}
+    
+signal_impl::iterator_type signal_impl::insert(signal_impl::iterator_type i, const slot_base& slot_)
+{
+  iterator_type temp = slots_.insert(i, slot_);
+  temp->set_parent(this, &notify);
+  return temp;
+}
+
+void signal_impl::sweep()
+{
+  iterator_type i = slots_.begin();
+  while (i != slots_.end())
+    if ((*i).empty())
+      i = slots_.erase(i);
+    else
+      ++i;
+}
+
+void* signal_impl::notify(void* d)
+{
+  signal_impl* self = (signal_impl*)d;
+  if (self->exec_count_ == 0)
+    self->sweep();
+  else                       // This is occuring during signal emission.
+    self->deferred_ = true;  // => sweep() will be called from ~signal_exec().
+  return 0;                  // This is safer because we don't have to care about our iterators in emit().
+}
+
+} /* namespace internal */
+
+signal_base::signal_base()
+: impl_(0)
+{}
+
+signal_base::signal_base(const signal_base& src)
+: trackable(),
+  impl_(src.impl())
+{
+  impl_->reference();
+}
+
+signal_base::~signal_base()
+{
+  if (impl_)
+    impl_->unreference();
+}
+
+void signal_base::clear()
+{
+  if (impl_)
+    impl_->clear();
+}
+
+signal_base::size_type signal_base::size() const
+{
+  return (impl_ ? impl_->size() : 0);
+}
+
+signal_base::iterator_type signal_base::connect(const slot_base& slot_)
+{
+  return impl()->connect(slot_);
+}
+
+signal_base::iterator_type signal_base::insert(iterator_type i, const slot_base& slot_)
+{
+  return impl()->insert(i, slot_);
+}
+
+signal_base::iterator_type signal_base::erase(iterator_type i)
+{
+  return impl()->erase(i);
+}
+
+signal_base& signal_base::operator = (const signal_base& src)
+{
+  if (impl_) impl_->unreference();
+  impl_ = src.impl();
+  impl_->reference();
+  return *this;
+}
+
+internal::signal_impl* signal_base::impl() const
+{
+  if (!impl_) {
+    impl_ = new internal::signal_impl;
+    impl_->reference();  // start with a reference count of 1
+  }
+  return impl_;
+}
+
+} /* sigc */