119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2011 Danny Robson <danny@blubinc.net>
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*/
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#ifndef __SIGNAL_HPP
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#define __SIGNAL_HPP
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#include "debug.hpp"
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#include "nocopy.hpp"
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#include <algorithm>
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#include <list>
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#include <functional>
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namespace util {
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template <typename Ret, typename ...Args>
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class signal {
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public:
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typedef Ret (*callback_function)(Args...);
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typedef std::function<Ret(Args...)> callback_object;
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protected:
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typedef std::list<callback_object> group;
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group m_children;
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public:
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typedef typename group::iterator cookie;
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struct scoped_cookie : public nocopy {
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cookie m_cookie;
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signal<Ret, Args...>& m_parent;
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scoped_cookie (cookie _cookie,
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signal<Ret, Args...> &_parent):
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m_cookie (_cookie),
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m_parent (_parent)
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{ ; }
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scoped_cookie (scoped_cookie &&rhs):
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m_cookie (rhs.m_cookie),
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m_parent (rhs.m_parent)
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{
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rhs.m_cookie = rhs.m_parent.m_children.end ();
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}
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~scoped_cookie () {
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if (m_parent.m_children.end () != m_cookie)
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m_parent.disconnect (m_cookie);
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}
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void renew (callback_object &&cb)
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{ *m_cookie = std::move (cb); }
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void release (void)
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{ m_cookie = m_parent.m_children.end (); }
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};
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public:
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signal ()
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{ /*m_children.reserve (16);*/ }
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/// Add a callback to list.
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const cookie
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connect (const callback_object &_cb)
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{ return m_children.insert (m_children.end (), _cb); }
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/// Add a callback to the list.
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const cookie
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connect (const callback_function &_cb)
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{ return m_children.insert (m_children.end (), _cb); }
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void disconnect (const cookie _cb)
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{ m_children.erase (_cb); }
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/// Disconnect all callbacks
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void clear (void)
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{ m_children.clear (); }
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/// Returns the number of callbacks connected.
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unsigned int size (void) const
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{ return m_children.size (); }
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bool empty (void) const
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{ return m_children.empty (); }
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/// Execute all callbacks, ignoring the return parameters. Does not combine results.
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void operator () (Args... tail) {
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for (auto i = m_children.cbegin (); i != m_children.cend (); ) {
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// Increment before we execute so that the caller is able to deregister during execution.
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auto current = i++;
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(*current)(tail...);
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}
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}
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};
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}
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#endif // __SIGNAL_HPP
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