Renamed JsonKey to JsonString

src/ArduinoJson/Strings/String.hpp

@@ -0,0 +1,32 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+namespace ARDUINOJSON_NAMESPACE {
+
+class String {
+ public:
+  String() : _data(0) {}
+  String(const char* slot) : _data(slot) {}
+
+  const char* c_str() const {
+    return _data;
+  }
+
+  bool isNull() const {
+    return !_data;
+  }
+
+  friend bool operator==(String lhs, String rhs) {
+    if (lhs._data == rhs._data) return true;
+    if (!lhs._data) return false;
+    if (!rhs._data) return false;
+    return strcmp(lhs._data, rhs._data) == 0;
+  }
+
+ private:
+  const char* _data;
+};
+}  // namespace ARDUINOJSON_NAMESPACE