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