i have just started studying concurrency in c++11 std But i can't get this program to compile
#include<future>
#include<iostream>
int func1(const int &i)
{
return i*i;
}
int func2(const int &i)
{
return 2*i;
}
int main()
{
auto result1(std::async(func1,2));//error in this line says invalid use of incomplete type 'class std::future<int>'
int result2 = func2(4);
int result = result1.get() + result2;
std::cout<<"\t result"<<result;
return 0;
}
Can somebody explain the error i have also tried using std::future instead of auto but it does not work.
