CODEWITHSUNDEEP
c++boostboost-sml
A. Crispino
A. Crispino

Reputation: 65

[Boost].SML pass guard parameters

I am getting started with [Boost].SML but i just don't get how to check an variable. I am trying to implement a ATM machine, where you have to put in a Code for getting access. So i was trying this: Guard

    const auto right_PIN = [](int pin){ cout << "PIN VALUE: " << pin << endl;
                                    if(pin == 1234){
                                        return true;
                                    }else{
                                        return false;
                                    }
                                };

transition table like this:

startState + event [right_PIN]  = rightState,
startState + event [!right_PIN] = wrontState,

Now before i process the event i want to pass a parameter to the guard to check if its the right pin.

Is this possible?

Upvotes: 0

Views: 1042

Answers (1)

A. Crispino
A. Crispino

Reputation: 65

I think I found a solution.

At first I declared a struct PIN with a value like this:

struct PIN {
    int value{};
};

then I updated the guard and implemented it in the struct for implementing the state machine:

const auto right_PIN = [](PIN& pin){ cout << "PIN VALUE: " << pin.value << endl;
                                    return pin.value == 1234;
                                };

In my main method i created an object of the struct pin and gave it to the state machine:

PIN p;
boost::sml::sm<bk> sm{p};

Then before processing the event i just updated the value of the PIN:

p.value = 1234;
sm.process_event(event());

Upvotes: 1

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