/*
* 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 .
*
* Copyright 2011-2015 Danny Robson
*/
#ifndef __UTIL_SIGNAL_HPP
#define __UTIL_SIGNAL_HPP
#include "nocopy.hpp"
#include "types/traits.hpp"
#include
#include
#include
namespace util {
namespace combine {
template
struct logical_and {
using R = typename func_traits::return_type;
template
R operator() (T first, T last, Args&&... args)
{
while (first != last)
if (!(*first++)(std::forward (args)...))
return false;
return true;
}
};
template
struct logical_or {
using R = typename func_traits::return_type;
template
R operator() (T first, T last, Args&&... args)
{
while (first != last)
if ((*first++)(std::forward (args)...))
return true;
return false;
}
};
template
struct noop {
using R = void;
template
R operator() (T first, T last, Args&&... args)
{
while (first != last) {
(*first++)(std::forward (args)...);
}
}
};
}
template class C = combine::noop>
class signal {
public:
using R = typename C::R;
using callback = std::function;
struct cookie;
public:
signal ();
~signal ();
/// Add a callback to list.
cookie connect (callback&&);
cookie connect (const callback&);
void disconnect (cookie&);
/// Disconnect all callbacks
void clear (void);
/// Returns the number of callbacks connected.
unsigned int size (void) const;
bool empty (void) const;
/// Execute all callbacks
template
R
operator() (Args&&... tail);
private:
typedef std::list group;
group m_children;
};
///////////////////////////////////////////////////////////////////////////
// wrap a value in a signal and trigger on assignment
//template class C>
template
class value_signal : public signal {
public:
value_signal (T);
value_signal () = default;
operator const T&() const;
value_signal& operator= (const T&);
private:
T m_value;
};
}
#include "signal.ipp"
#endif // __SIGNAL_HPP