这段代码会调用几次拷贝构造？

#include <iostream>
#include <future>
using namespace std;

class Work {
private:
    int val;
public:
    Work(int t_val = 42) : val(t_val) {
        cout << "constructor " << this << endl;
    }
    Work(const Work &other) {
        this->val = other.val;
        cout << "copy constructor " << this << endl;
    }
    std::future<int> spaw() {
        cout << "in spaw " << endl;
        return std::async([=, tmp = *this]() {
            cout << "lambda "  << this << endl;
            return tmp.val;});
    }
    ~Work() {
        cout << "destructor "  << this << endl;
    }
};
std::future<int> foo() {
    cout << "in foo " << endl;
    Work t;
    return t.spaw();
}
int main() {
    cout << "in main " << endl;
    std::future<int> f = foo();
    f.wait();
    cout << f.get() << endl;
    return 0;
}