#include <iostream>
#include <string>
#include <iostream>
#include <thread>
#include <sstream>
using namespace std;
template <typename T>
std::string to_str(const T &value)
{
std::ostringstream oss;
oss << value;
return oss.str();
}
int main() {
printf("[%s] ", to_str(std::this_thread::get_id()).c_str() );
return 0;
}
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