refresh struct

examples/logger/main.cpp

@@ -0,0 +1,17 @@
+#include <set>
+#include <unordered_set>
+
+#include "hack/logger/logger.hpp"
+
+auto main(int argc, char *argv[]) -> int
+{
+  std::set<int> s { 1, 2, 3 };
+  hack::log()(s);
+
+  std::vector<int> v { 1, 2, 3 };
+  hack::log()(v, s);
+
+  std::unordered_set<int> us { 1, 2, 3 };
+
+  hack::log()(v, s, us);
+}