how to check if personID is in my_customers (see my example) - c++

Question

In C++, the interface for this file says
*If no soup left returns OUT_OF_SOUP
* If personID not found in my_customers AND numbBowlsSoupLeft>0 then give this person a bowl of soup (return BOWL_OF_SOUP)
* and record it by creating new customer struct using personID, numbBowlsSoup=1 and adding this struct to my_customers, be sure to decrement numbBowlsSoupLeft.
for my implementation, I'm trying to put
int Soupline::getSoup(int personID) {
if (numBowlsSoupLeft == 0) {
return OUT_OF_SOUP;
}
if (!(personID : my_customers) && numbBowlsSoupLeft > 0) {
}
But that second if statement is giving me syntax errros, I just want to know how to check to see if the personID is IN my_customers?
my_customers was created in the soupline interface using:
std::vector<customer> my_customers; // keeps track of customers

Answer 1

First you want to use find() to search a vector.
Second, please handle the case if numbBowlsSoupLeft < 0, because that can be a huge source of problem.
Third, your syntax error is the (personID : my_customers), the : is for iteration.
int Soupline::getSoup(int personID) {
if (numBowlsSoupLeft <= 0) { // handles negative numBowlsSoupLeft
return OUT_OF_SOUP;
}
bool found_customer = false;
for (auto c : my_customers) {
if (personID == c.person_id()) { // This is my guess on how the id is stored in customer class
// Logic to process soup for customer
found_customer = true;
break;
}
}
if (!found_customer) {
// Logic to process non-customer asking for soup?
}
}
Sorry i dunno what is the return integer is supposed to be, so it is not defined in my code example.