Class BigTask

test/test_function.cc:28–47

};

class BigTask {
public:
    BigTask() {
        cout<<"BigTask: construct"<<endl;
    }
    BigTask(const BigTask&) {
        cout<<"BigTask: copy construct"<<endl;
    }
    BigTask(BigTask&&) {
        cout<<"BigTask: move construct"<<endl;
    }
    ~BigTask() {
        cout<<"BigTask: distruct"<<endl;
    }
    void operator()() {
        cout<<"BigTask: run"<<endl;
    }
private:
    char a[64];
};

template <typename T>
void safe_exec(T& e) {