fn token_index(&self, token_id: &AccountId) -> usize {
        self.token_account_ids
            .iter()
            .position(|id| id == token_id)
            .expect(ERR63_MISSING_TOKEN)
    }
/// Returns token index for given token account_id.
Returns token index for given token account_id.
Returns token index for given token account_id .
fn token_index(&self, token_id: &AccountId) -> usize {
        self.token_account_ids
            .iter()
            .position(|id| id == token_id)
            .expect(ERR63_MISSING_TOKEN)
    }
fn token_index ( & self , token_id : & AccountId ) -> usize { self . token_account_ids . iter ( ) . position ( | id | id == token_id ) . expect ( ERR63_MISSING_TOKEN ) }
Returns token index for given token account_id.
Returns token index for given token account_id .
&self
token_id
&AccountId
&self
token_id
&AccountId