190 lines
4.8 KiB
C++
190 lines
4.8 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 2011-2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_SIGNAL_HPP
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#error
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#endif
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#include "debug.hpp"
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#include <algorithm>
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namespace util {
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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struct signal<F>::cookie : public nocopy {
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cookie (typename group::iterator, signal<F> &parent);
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cookie (cookie &&rhs);
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~cookie ();
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void reset (callback &&cb);
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void reset (void);
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typename group::iterator m_position;
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signal<F> &m_parent;
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};
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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signal<F>::cookie::cookie (typename group::iterator _position,
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signal<F> &_parent):
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m_position (_position),
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m_parent (_parent)
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{ ; }
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//-------------------------------------------------------------------------
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template <typename F>
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signal<F>::cookie::cookie (cookie &&rhs):
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m_position (rhs.m_position),
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m_parent (rhs.m_parent)
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{
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rhs.m_position = rhs.m_parent.m_children.end ();
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}
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//-------------------------------------------------------------------------
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template <typename F>
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signal<F>::cookie::~cookie ()
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{
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if (m_parent.m_children.end () != m_position)
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m_parent.disconnect (*this);
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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void
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signal<F>::cookie::reset (callback &&cb)
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{
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*m_position = std::move (cb);
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}
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//-------------------------------------------------------------------------
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template <typename F>
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void
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signal<F>::cookie::reset (void)
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{
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m_position = m_parent.m_children.end ();
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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signal<F>::signal ()
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{ ; }
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//-------------------------------------------------------------------------
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template <typename F>
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signal<F>::~signal ()
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{
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CHECK (empty ());
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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typename signal<F>::cookie
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signal<F>::connect (const callback &_cb)
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{
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return cookie (m_children.insert (m_children.end (), _cb), *this);
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}
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//-------------------------------------------------------------------------
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template <typename F>
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void
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signal<F>::disconnect (const cookie &c)
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{
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m_children.erase (c.m_position);
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}
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//-------------------------------------------------------------------------
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/// Disconnect all callbacks
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template <typename F>
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void
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signal<F>::clear (void)
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{
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m_children.clear ();
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}
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///////////////////////////////////////////////////////////////////////////
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/// Returns the number of callbacks connected.
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template <typename F>
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unsigned int
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signal<F>::size (void) const
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{
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return m_children.size ();
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}
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//-------------------------------------------------------------------------
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template <typename F>
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bool
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signal<F>::empty (void) const
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{
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return m_children.empty ();
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename F>
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template <typename ...Args>
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void
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signal<F>::operator () (Args&&... tail) {
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if (m_children.empty ())
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return;
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auto i = m_children.cbegin ();
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bool looping;
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do {
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// Increment before we execute so that the caller is able to
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// deregister during execution.
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auto current = i++;
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looping = m_children.cend () != i;
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(*current)(std::forward<Args> (tail)...);
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} while (looping);
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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value_signal<T>::operator const T&() const
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{
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return m_value;
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}
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template <typename T>
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value_signal<T>&
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value_signal<T>::operator= (const T &t)
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{
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m_value = t;
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(*this) (m_value);
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return *this;
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}
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}
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