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Goober5000
4b3894c0a5
For every move and move-assignment constructor, do the following: 1. Make it default if possible 2. Add or delete where appropriate 3. Check for move-onto-self 4. Apply `std::move` where needed Also fix problematic moves in `player_h`
56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
#pragma once
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#include "globalincs/pstypes.h"
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#include <functional>
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namespace util {
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template <typename Ret, typename... Args>
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class event final {
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public:
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using callback_type = std::function<Ret(Args...)>;
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event() = default;
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~event() = default;
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// no copies
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event(const event<Ret, Args...>& other) = delete;
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event<Ret, Args...>& operator=(const event<Ret, Args...>& other) = delete;
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// moves allowed
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event(event<Ret, Args...>&& other) noexcept = default;
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event<Ret, Args...>& operator=(event<Ret, Args...>&& other) noexcept = default;
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void add(callback_type func) { _listeners.push_back(func); }
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void clear() { _listeners.clear(); }
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// This variant is used if the listeners return no values
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template <typename Dummy = void>
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inline typename std::enable_if<std::is_same<Ret, void>::value, Dummy>::type operator()(Args... args) const
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{
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for (const auto& l : _listeners) {
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l(args...);
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}
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}
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// In this case we collect the return values and return them to the caller
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template <typename Dummy = SCP_vector<Ret>>
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inline typename std::enable_if<!std::is_same<Ret, void>::value, Dummy>::type operator()(Args... args) const
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{
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SCP_vector<Ret> vals;
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for (const auto& l : _listeners) {
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vals.push_back(l(args...));
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}
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return vals;
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}
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private:
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SCP_vector<callback_type> _listeners;
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};
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} // namespace util
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