#include <iostream>
#include <vector>
class cls {
public:
cls() {cls(5);}
cls(int n) {v.resize(n);}
std::vector<int> v;
};
int main(int argc, const char* argv[]) {
cls x, y(5);
std::cout << x.v.size() << std::endl; // prints 5
std::cout << y.v.size(); // prints 0
return 0;
}
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