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67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
//
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// Created by Zoe Roux on 5/21/21.
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//
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#pragma once
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#include <functional>
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#include <utility>
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#include <unordered_map>
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namespace WAL
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{
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//! @brief A callback where you can subscribe to and emit it.
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template<typename ...Types>
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class Callback
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{
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private:
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int _nextID = 0;
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//! @brief The list of functions to call.
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std::unordered_map<int, std::function<void (Types...)>> _functions = {};
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public:
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//! @brief Add a method to be called when this callback is invoked.
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//! @param callback The list of arguments of the callback method
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//! @return A unique ID for this callback. That can be used to remove the callback later.
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template<typename Func>
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int addCallback(Func callback)
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{
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int id = this->_nextID++;
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if constexpr(std::is_same_v<Func, std::function<void (Types...)>>)
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this->_functions[id] = std::move(callback);
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else
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this->_functions[id] = std::function<void (Types...)>(callback);
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return id;
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}
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//! @brief Remove a function from this callback.
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//! @param id The ID of the function.
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void removeCallback(int id)
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{
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this->_functions.erase(id);
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}
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void operator()(Types ...args) const
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{
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for (const auto &[_, callback] : this->_functions)
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callback(args...);
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}
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//! @brief A default constructor
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Callback() = default;
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//! @brief A default copy constructor
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Callback(const Callback &) = default;
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//! @brief A default destructor
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~Callback() = default;
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//! @brief A default assignment operator
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Callback &operator=(const Callback &) = default;
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//! @brief Implicitly transform a callable into a callback.
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template<typename Func>
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Callback(Func callback) // NOLINT(google-explicit-constructor)
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{
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this->addCallback(callback);
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}
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};
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} // namespace WAL
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