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#pragma once
#include <memory>
union SDL_Event;
enum ModeSecondClick { Unset, Reset, NoAction };
template<typename Target, ModeSecondClick msc = ModeSecondClick::Unset> class Mode {
public:
explicit Mode(Target & t) : target {t} { }
Target & target;
template<typename Mode, typename... Params>
auto
toggle(Params &&... params)
{
return [params..., this](const SDL_Event &) {
toggleSetMode<Mode>(std::forward<Params>(params)...);
};
}
private:
template<typename Mode, typename... Params>
void
toggleSetMode(Params &&... params)
{
if (dynamic_cast<Mode *>(target.get())) {
if constexpr (msc == ModeSecondClick::Unset) {
target.reset();
}
if constexpr (msc == ModeSecondClick::Reset) {
target = std::make_unique<Mode>(std::forward<Params>(params)...);
}
}
else {
target = std::make_unique<Mode>(std::forward<Params>(params)...);
}
}
};
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