JsonString: move adapter class in the same file

Author: bblanchon

extras/tests/Misc/StringAdapters.cpp

@@ -5,6 +5,7 @@
 #include <Arduino.h>
 
 #include <ArduinoJson/Strings/IsString.hpp>
+#include <ArduinoJson/Strings/JsonString.hpp>
 #include <ArduinoJson/Strings/StringAdapters.hpp>
 
 #include <catch.hpp>

src/ArduinoJson/Strings/Adapters/JsonString.hpp

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <ArduinoJson/Strings/Adapters/RamString.hpp>
+
 #if ARDUINOJSON_ENABLE_STD_STREAM
 #  include <ostream>
 #endif
@@ -81,4 +83,15 @@ class JsonString {
   detail::RamString str_;
 };
 
+namespace detail {
+template <>
+struct StringAdapter<JsonString> {
+  using AdaptedString = RamString;
+
+  static const AdaptedString& adapt(const JsonString& s) {
+    return s.str_;
+  }
+};
+}  // namespace detail
+
 ARDUINOJSON_END_PUBLIC_NAMESPACE

src/ArduinoJson/Strings/JsonString.hpp

@@ -5,7 +5,6 @@
 #pragma once
 
 #include <ArduinoJson/Polyfills/type_traits.hpp>
-#include <ArduinoJson/Strings/Adapters/JsonString.hpp>
 #include <ArduinoJson/Strings/Adapters/RamString.hpp>
 #include <ArduinoJson/Strings/Adapters/StringObject.hpp>