// Boost.Signals library | |
// Copyright Douglas Gregor 2001-2004. | |
// Copyright Frank Mori Hess 2007. Use, modification and | |
// distribution is subject to the Boost Software License, Version | |
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// For more information, see http://www.boost.org | |
#ifndef BOOST_SIGNALS2_SIGNALS_COMMON_HPP | |
#define BOOST_SIGNALS2_SIGNALS_COMMON_HPP | |
#include <boost/mpl/bool.hpp> | |
#include <boost/mpl/if.hpp> | |
#include <boost/ref.hpp> | |
#include <boost/signals2/signal_base.hpp> | |
#include <boost/type_traits/is_base_of.hpp> | |
namespace boost { | |
namespace signals2 { | |
namespace detail { | |
// Determine if the given type T is a signal | |
template<typename T> | |
class is_signal: public mpl::bool_<is_base_of<signal_base, T>::value> | |
{}; | |
// A slot can be a signal, a reference to a function object, or a | |
// function object. | |
struct signal_tag {}; | |
struct reference_tag {}; | |
struct value_tag {}; | |
// Classify the given slot as a signal, a reference-to-slot, or a | |
// standard slot | |
template<typename S> | |
class get_slot_tag { | |
typedef typename mpl::if_<is_signal<S>, | |
signal_tag, value_tag>::type signal_or_value; | |
public: | |
typedef typename mpl::if_<is_reference_wrapper<S>, | |
reference_tag, | |
signal_or_value>::type type; | |
}; | |
// Get the slot so that it can be copied | |
template<typename F> | |
typename F::weak_signal_type | |
get_invocable_slot(const F &signal, signal_tag) | |
{ return typename F::weak_signal_type(signal); } | |
template<typename F> | |
const F& | |
get_invocable_slot(const F& f, reference_tag) | |
{ return f; } | |
template<typename F> | |
const F& | |
get_invocable_slot(const F& f, value_tag) | |
{ return f; } | |
// Determines the type of the slot - is it a signal, a reference to a | |
// slot or just a normal slot. | |
template<typename F> | |
typename get_slot_tag<F>::type | |
tag_type(const F&) | |
{ | |
typedef typename get_slot_tag<F>::type | |
the_tag_type; | |
the_tag_type tag = the_tag_type(); | |
return tag; | |
} | |
} // end namespace detail | |
} // end namespace signals2 | |
} // end namespace boost | |
#endif // BOOST_SIGNALS2_SIGNALS_COMMON_HPP |