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#pragma once
#include <utility>
#include <functional>
#include <map>
template<class T>
class FSM {
T previousState;
T &state;
std::map<Transaction, std::function<void()>> handlers;
public:
using Transaction = std::pair<T, T>;
FSM(T &value) : state(value), previousState(value) {}
~FSM() = default;
void Update() {
auto handler = handlers[Transaction{previousState, state}];
if (handler)
handler();
}
void RegisterHandler(T state, std::function<void()> handler) {
handlers[Transaction{state, state}] = handler;
}
void RegisterTransactionHandler(Transaction transaction, std::function<void()> handler) {
handlers[transaction] = handler;
}
};
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