#include <string>
#include <type_traits>
#include <utility>
+#include <mutex>
using namespace std;
using kv_pair = pair<string, string>;
-template<typename T>
-enable_if_t<is_integral_v<T>, T> random_num(T min, T max) {
- using namespace chrono;
- using rnd = mt19937_64;
- using dst = uniform_int_distribution<uintmax_t>;
+extern mt19937_64 rnd_eng;
+extern mutex rnd_mtx;
- static auto time = duration_cast<nanoseconds>(system_clock::now().time_since_epoch());
- static auto seed = static_cast<rnd::result_type>(time.count());
- static auto rgen = rnd{seed};
+void random_setup();
- return dst(min, max)(rgen);
+template<typename T>
+enable_if_t<is_integral_v<T>, T> random_num(T min, T max) {
+ lock_guard m{rnd_mtx};
+ return uniform_int_distribution<T>(min, max)(rnd_eng);
}
unsigned random_port();