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#include <iostream>
#include <fstream>
#include <future>
#include <mutex>
#include <thread>
#include <condition_variable>
using namespace std;
//code
mutex carDetailsMutex;
condition_variable condition;
string carDetails;
packaged_task<size_t (std::string const &)> serviceTask;
size_t volkswagen(string const &type)
{
cout << "performing maintenance by the book for a " << type << '\n';
return type.size() * 75; // the size of the bill
}
size_t peugeot(string const &type)
{
cout << "performing quick and dirty maintenance for a " << type << '\n';
return type.size() * 50; // the size of the bill
}
void garage()
{
while (true)
{
unique_lock<mutex> lk(carDetailsMutex);
while (carDetails.empty())
condition.wait(lk);
cout << "servicing a " << carDetails << '\n';
serviceTask(carDetails);
carDetails.clear();
}
}
int main()
{
thread(garage).detach();
while (true)
{
string car;
if (not getline(cin, car) || car.empty())
break;
{
lock_guard<mutex> lk(carDetailsMutex);
carDetails = car;
}
serviceTask = packaged_task<size_t (string const &)>(
car[0] == 'v' ? volkswagen : peugeot
);
auto bill = serviceTask.get_future();
condition.notify_one();
cout << "Bill for servicing a " << car <<
": EUR " << bill.get() << '\n';
}
}
//=
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