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77 lines
2.3 KiB
77 lines
2.3 KiB
// 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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