libcruft-util/signal.hpp

119 lines
3.6 KiB
C++

/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011 Danny Robson <danny@blubinc.net>
*/
#ifndef __SIGNAL_HPP
#define __SIGNAL_HPP
#include "debug.hpp"
#include "nocopy.hpp"
#include <algorithm>
#include <list>
#include <functional>
namespace util {
template <typename Ret, typename ...Args>
class signal {
public:
typedef Ret (*callback_function)(Args...);
typedef std::function<Ret(Args...)> callback_object;
protected:
typedef std::list<callback_object> group;
group m_children;
public:
typedef typename group::iterator cookie;
struct scoped_cookie : public nocopy {
cookie m_cookie;
signal<Ret, Args...>& m_parent;
scoped_cookie (cookie _cookie,
signal<Ret, Args...> &_parent):
m_cookie (_cookie),
m_parent (_parent)
{ ; }
scoped_cookie (scoped_cookie &&rhs):
m_cookie (rhs.m_cookie),
m_parent (rhs.m_parent)
{
rhs.m_cookie = rhs.m_parent.m_children.end ();
}
~scoped_cookie () {
if (m_parent.m_children.end () != m_cookie)
m_parent.disconnect (m_cookie);
}
void renew (callback_object &&cb)
{ *m_cookie = std::move (cb); }
void release (void)
{ m_cookie = m_parent.m_children.end (); }
};
public:
signal ()
{ /*m_children.reserve (16);*/ }
/// Add a callback to list.
const cookie
connect (const callback_object &_cb)
{ return m_children.insert (m_children.end (), _cb); }
/// Add a callback to the list.
const cookie
connect (const callback_function &_cb)
{ return m_children.insert (m_children.end (), _cb); }
void disconnect (const cookie _cb)
{ m_children.erase (_cb); }
/// Disconnect all callbacks
void clear (void)
{ m_children.clear (); }
/// Returns the number of callbacks connected.
unsigned int size (void) const
{ return m_children.size (); }
bool empty (void) const
{ return m_children.empty (); }
/// Execute all callbacks, ignoring the return parameters. Does not combine results.
void operator () (Args... tail) {
for (auto i = m_children.cbegin (); i != m_children.cend (); ) {
// Increment before we execute so that the caller is able to deregister during execution.
auto current = i++;
(*current)(tail...);
}
}
};
}
#endif // __SIGNAL_HPP