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#pragma once
#include "globalincs/pstypes.h"
#include <functional>
namespace util {
template <typename Ret, typename... Args>
class event final {
public:
using callback_type = std::function<Ret(Args...)>;
event() = default;
~event() = default;
void add(callback_type func) { _listeners.push_back(func); }
void clear() { _listeners.clear(); }
// This variant is used if the listeners return no values
template <typename Dummy = void>
inline typename std::enable_if<std::is_same<Ret, void>::value, Dummy>::type operator()(Args... args) const
{
for (const auto& l : _listeners) {
l(args...);
}
}
// In this case we collect the return values and return them to the caller
template <typename Dummy = SCP_vector<Ret>>
inline typename std::enable_if<!std::is_same<Ret, void>::value, Dummy>::type operator()(Args... args) const
{
SCP_vector<Ret> vals;
for (const auto& l : _listeners) {
vals.push_back(l(args...));
}
return vals;
}
private:
SCP_vector<callback_type> _listeners;
};
} // namespace util
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