127 lines
3.4 KiB
C++
127 lines
3.4 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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#define __UTIL_SIGNAL_HPP
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#include "types/traits.hpp"
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#include <functional>
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#include <list>
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namespace util {
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namespace combine {
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template <typename F>
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struct logical_and {
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using R = typename func_traits<F>::return_type;
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template <typename T, typename ...Args>
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R operator() (T first, T last, Args&&... args)
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{
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while (first != last)
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if (!(*first++)(args...))
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return false;
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return true;
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}
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};
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template <typename F>
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struct logical_or {
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using R = typename func_traits<F>::return_type;
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template <typename T, typename ...Args>
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R operator() (T first, T last, Args&&... args)
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{
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while (first != last)
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if ((*first++)(args...))
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return true;
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return false;
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}
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};
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template <typename F>
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struct noop {
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using R = void;
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template <typename T, typename ...Args>
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R operator() (T first, T last, Args&&... args)
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{
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while (first != last) {
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(*first++)(args...);
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}
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}
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};
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}
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template <typename F, template <typename> class C = combine::noop>
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class signal {
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public:
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using R = typename C<F>::R;
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using callback = std::function<F>;
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struct cookie;
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public:
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signal ();
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~signal ();
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/// Add a callback to list.
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cookie connect [[gnu::warn_unused_result]] (callback&&);
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cookie connect [[gnu::warn_unused_result]] (const callback&);
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void disconnect (cookie&);
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/// Disconnect all callbacks
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void clear (void);
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/// Returns the number of callbacks connected.
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size_t size (void) const;
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bool empty (void) const;
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/// Execute all callbacks
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template <typename ...Args>
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R
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operator() (Args&&... tail);
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private:
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typedef std::list<callback> group;
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group m_children;
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};
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///////////////////////////////////////////////////////////////////////////
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// wrap a value in a signal and trigger on assignment
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//template <typename T, template <typename> class C>
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template <typename T>
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class value_signal : public signal<void(T)> {
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public:
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explicit value_signal (T);
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value_signal () = default;
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operator const T&() const;
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value_signal<T>& operator= (const T&);
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private:
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T m_value;
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};
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}
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#include "signal.ipp"
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#endif // __SIGNAL_HPP
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