1 files changed, 27 insertions, 0 deletions
diff --git a/include/lib/ArduinoJson/TypeTraits/IsBaseOf.hpp b/include/lib/ArduinoJson/TypeTraits/IsBaseOf.hpp
new file mode 100644
index 0000000..bf24e96
--- /dev/null
+++ b/include/lib/ArduinoJson/TypeTraits/IsBaseOf.hpp
@@ -0,0 +1,27 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+namespace ArduinoJson {
+namespace Internals {
+
+// A meta-function that returns true if Derived inherits from TBase is an
+// integral type.
+template <typename TBase, typename TDerived>
+class IsBaseOf {
+ protected:  // <- to avoid GCC's "all member functions in class are private"
+  typedef char Yes[1];
+  typedef char No[2];
+
+  static Yes &probe(const TBase *);
+  static No &probe(...);
+
+ public:
+  enum {
+    value = sizeof(probe(reinterpret_cast<TDerived *>(0))) == sizeof(Yes)
+  };
+};
+}
+}