CODEWITHSUNDEEP
error-handlingrust
eth_sign
eth_sign

Reputation: 83

Returning Result<(), Box<dyn Error>> in rust

I have a function in golang -


func (s *Server) getEnforcer(handle int) (*casbin.Enforcer, error) {
    if _, ok := s.enforcerMap[handle]; ok {
        return s.enforcerMap[handle], nil
    } else {
        return nil, errors.New("enforcer not found")
    }
}

I am trying to implement this in rust. I have written this -

impl Server {
    fn getEnforcer(&mut self, handle: i32) -> Result<Enforcer, Box<dyn Error>> {
        let e: Enforcer = self.enforcerMap[&handle];
        // match ..
    }
}

Can't figure out how to handle error.

Upvotes: 0

Views: 1622

Answers (1)

Custards1
Custards1

Reputation: 133

Better yet, return an option because the only possible error is that the index is not present in the map,

so..

impl Server {
    pub fn getEnforcer(&self,handle:i32)->Option<&Enforcer> {
        self.enforcerMap.get(&handle)
    }
    pub fn getEnforcerMut(&mut self,handle:i32)->Option<&mut Enforcer> {
        self.enforcerMap.get_mut(&handle)
    }
}

however I highly suggest this link and this link

Upvotes: 3

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