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#pragma once
#include <functional>
namespace cru {
struct Guard {
using ExitFunc = std::function<void()>;
Guard() = default;
explicit Guard(const ExitFunc& f) : on_exit(f) {}
explicit Guard(ExitFunc&& f) : on_exit(std::move(f)) {}
Guard(const Guard&) = delete;
Guard(Guard&&) = default;
Guard& operator=(const Guard&) = delete;
Guard& operator=(Guard&&) = default;
~Guard() {
if (on_exit) {
on_exit();
}
}
void Drop() { on_exit = {}; }
ExitFunc on_exit;
};
} // namespace cru
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