Maybe < Customer const > getCustomer(Customers const &customers, std::string const &id)
{
auto customer = customers.find(id);
if (customer == customers.end())
return nothing();
else
return just(customer->second);
};
void Persist::saveCustomers(Customers& customers)
{
Customers::iterator iterator;
const char* fileName = Customer::FILE_NAME.c_str();
std::ofstream file(fileName, std::ios::out);
if (!file)
{
std::cerr << "Error while opening " << fileName << std::endl;
exit(EXIT_FAILURE);
}
for (iterator = customers.begin(); iterator != customers.end(); ++iterator)
{
Customer customer = (*iterator).second;
file.write(reinterpret_cast<const char*>(&customer), sizeof(Customer));
}
file.close();
}