Does std::future in c++ support polymorphism? So, if to store child_class
in future<parent_class>
, can I after get it after by dynamic_cast<child_class>
?
Providing you use a reference or a pointer (probably obvious since it'll fail to compile otherwise)... Yes.
#include <iostream>
#include <future>
using namespace std;
struct Parent {
virtual void a() { cout << "I am parent"; }
};
struct Child : Parent {
virtual void a() { cout << "I am child"; }
};
Child g_c; //just some global for the purposes of the example
int main() {
std::future<Parent&> p = async(launch::async, []() -> Parent& { return g_c; });
auto c = dynamic_cast<Child&>(p.get());
c.a();
return 0;
}
code result here: http://ideone.com/4Qmjvc
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