struct Mem {
            Mem(): _i(5) {
    std::cout << "i is : " << _i << std::endl;
}

        private:
            int _i;
        };

        struct Tester {
            Tester() {
                std::cout << " Running Tester " << std::endl;
            }
        private:
            static thread_local Mem _mem;
        };

#include <iostream>
#include "Test.hpp"
thread_local Mem Tester::_mem;

int main() {
    Tester t;
}