User can now use a JsonString as a key or a value

src/ArduinoJson/Strings/RamStringAdapter.hpp

@@ -0,0 +1,47 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "ConstRamStringAdapter.hpp"
+
+namespace ARDUINOJSON_NAMESPACE {
+
+class RamStringAdapter : public ConstRamStringAdapter {
+ public:
+  RamStringAdapter(const char* str) : ConstRamStringAdapter(str) {}
+
+  char* save(MemoryPool* pool) const {
+    if (!_str) return NULL;
+    size_t n = size() + 1;
+    char* dup = pool->allocFrozenString(n);
+    if (dup) memcpy(dup, _str, n);
+    return dup;
+  }
+
+  bool isStatic() const {
+    return false;
+  }
+};
+
+template <typename TChar>
+inline RamStringAdapter adaptString(const TChar* str) {
+  return RamStringAdapter(reinterpret_cast<const char*>(str));
+}
+
+inline RamStringAdapter adaptString(char* str) {
+  return RamStringAdapter(str);
+}
+
+template <typename TChar>
+struct IsString<TChar*> {
+  static const bool value = sizeof(TChar) == 1;
+};
+
+template <>
+struct IsString<void*> {
+  static const bool value = false;
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE