feat: 全量同步 254 个常用的 Arduino 扩展库文件

arduino-libs/arduino-cli/libraries/ArduinoJson_6.x/ArduinoJson/Variant/VariantTo.hpp

@@ -0,0 +1,32 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Namespace.hpp>
+
+namespace ARDUINOJSON_NAMESPACE {
+class ArrayRef;
+class ObjectRef;
+class VariantRef;
+
+// A metafunction that returns the type of the value returned by
+// VariantRef::to<T>()
+template <typename T>
+struct VariantTo {};
+
+template <>
+struct VariantTo<ArrayRef> {
+  typedef ArrayRef type;
+};
+template <>
+struct VariantTo<ObjectRef> {
+  typedef ObjectRef type;
+};
+template <>
+struct VariantTo<VariantRef> {
+  typedef VariantRef type;
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE