Source release 19.1.0

core/test/test_printers.cpp

@@ -79,3 +79,20 @@ void PrintTo(const SystemState& state, std::ostream* os) {
 }
 }  // namespace okp
 }  // namespace wvcdm
+
+namespace std {
+void PrintTo(future_status status, ostream* os) {
+  switch (status) {
+    case future_status::ready:
+      *os << "future_status::ready";
+      return;
+    case future_status::timeout:
+      *os << "future_status::timeout";
+      return;
+    case future_status::deferred:
+      *os << "future_status::deferred";
+      return;
+  }
+  *os << "<unknown(" << static_cast<int>(status) << ")>";
+}
+}  // namespace std