Extract VariantProxy from ElementProxy and MemberProxy

src/ArduinoJson/Variant/VariantProxy.hpp

@@ -0,0 +1,185 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2022, Benoit BLANCHON
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Configuration.hpp>
+#include <ArduinoJson/Variant/VariantOperators.hpp>
+#include <ArduinoJson/Variant/VariantShortcuts.hpp>
+#include <ArduinoJson/Variant/VariantTo.hpp>
+
+#ifdef _MSC_VER
+#  pragma warning(push)
+#  pragma warning(disable : 4522)
+#endif
+
+namespace ARDUINOJSON_NAMESPACE {
+
+template <typename TDataSource>
+class VariantProxy : public VariantShortcuts<VariantProxy<TDataSource> >,
+                     public VariantOperators<VariantProxy<TDataSource> >,
+                     public VariantTag {
+  friend class VariantAttorney;
+
+ public:
+  explicit FORCE_INLINE VariantProxy(TDataSource source) : _source(source) {}
+
+  // Copy-constructor required because of user-defined copy-assignment operator
+  FORCE_INLINE VariantProxy(const VariantProxy& src) : _source(src._source) {}
+
+  FORCE_INLINE VariantProxy& operator=(const VariantProxy& src) {
+    getOrAddUpstreamVariant().set(src);
+    return *this;
+  }
+
+  template <typename T>
+  FORCE_INLINE VariantProxy& operator=(const T& src) {
+    getOrAddUpstreamVariant().set(src);
+    return *this;
+  }
+
+  template <typename T>
+  FORCE_INLINE VariantProxy& operator=(T* src) {
+    getOrAddUpstreamVariant().set(src);
+    return *this;
+  }
+
+  FORCE_INLINE void clear() const {
+    getUpstreamVariant().clear();
+  }
+
+  FORCE_INLINE bool isNull() const {
+    return getUpstreamVariantConst().isNull();
+  }
+
+  template <typename T>
+  FORCE_INLINE typename enable_if<!is_same<T, char*>::value &&
+                                      !ConverterNeedsWriteableRef<T>::value,
+                                  T>::type
+  as() const {
+    return getUpstreamVariantConst().template as<T>();
+  }
+
+  template <typename T>
+  FORCE_INLINE typename enable_if<ConverterNeedsWriteableRef<T>::value, T>::type
+  as() const {
+    return getUpstreamVariant().template as<T>();
+  }
+
+  template <typename T>
+  FORCE_INLINE typename enable_if<is_same<T, char*>::value, const char*>::type
+  ARDUINOJSON_DEPRECATED("Replace as<char*>() with as<const char*>()")
+      as() const {
+    return as<const char*>();
+  }
+
+  template <typename T>
+  FORCE_INLINE operator T() const {
+    return as<T>();
+  }
+
+  template <typename T>
+  FORCE_INLINE typename VariantTo<T>::type to() {
+    return getOrAddUpstreamVariant().template to<T>();
+  }
+
+  template <typename T>
+  FORCE_INLINE
+      typename enable_if<ConverterNeedsWriteableRef<T>::value, bool>::type
+      is() const {
+    return getUpstreamVariant().template is<T>();
+  }
+
+  template <typename T>
+  FORCE_INLINE
+      typename enable_if<!ConverterNeedsWriteableRef<T>::value, bool>::type
+      is() const {
+    return getUpstreamVariantConst().template is<T>();
+  }
+
+  FORCE_INLINE void shallowCopy(VariantConstRef value) {
+    getOrAddUpstreamVariant().shallowCopy(value);
+  }
+
+  template <typename T>
+  FORCE_INLINE bool set(const T& value) {
+    return getOrAddUpstreamVariant().set(value);
+  }
+
+  template <typename T>
+  FORCE_INLINE bool set(T* value) {
+    return getOrAddUpstreamVariant().set(value);
+  }
+
+  FORCE_INLINE size_t size() const {
+    return getUpstreamVariantConst().size();
+  }
+
+  FORCE_INLINE size_t memoryUsage() const {
+    return getUpstreamVariantConst().memoryUsage();
+  }
+
+  FORCE_INLINE VariantRef add() const {
+    return getOrAddUpstreamVariant().add();
+  }
+
+  using ArrayShortcuts<VariantProxy<TDataSource> >::add;
+
+  FORCE_INLINE void remove(size_t index) const {
+    getUpstreamVariant().remove(index);
+  }
+  // remove(char*) const
+  // remove(const char*) const
+  // remove(const __FlashStringHelper*) const
+  template <typename TChar>
+  FORCE_INLINE typename enable_if<IsString<TChar*>::value>::type remove(
+      TChar* key) const {
+    getUpstreamVariant().remove(key);
+  }
+  // remove(const std::string&) const
+  // remove(const String&) const
+  template <typename TString>
+  FORCE_INLINE typename enable_if<IsString<TString>::value>::type remove(
+      const TString& key) const {
+    getUpstreamVariant().remove(key);
+  }
+
+ protected:
+  FORCE_INLINE MemoryPool* getPool() const {
+    return _source.getPool();
+  }
+
+  FORCE_INLINE VariantData* getData() const {
+    return _source.getData();
+  }
+
+  FORCE_INLINE VariantData* getOrCreateData() const {
+    return _source.getOrCreateData();
+  }
+
+ private:
+  FORCE_INLINE VariantRef getUpstreamVariant() const {
+    return VariantRef(getPool(), getData());
+  }
+
+  FORCE_INLINE VariantConstRef getUpstreamVariantConst() const {
+    return VariantConstRef(getData());
+  }
+
+  FORCE_INLINE VariantRef getOrAddUpstreamVariant() const {
+    return VariantRef(getPool(), getOrCreateData());
+  }
+
+  friend void convertToJson(const VariantProxy& src, VariantRef dst) {
+    dst.set(src.getUpstreamVariantConst());
+  }
+
+  const TDataSource _source;
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE
+
+#ifdef _MSC_VER
+#  pragma warning(pop)
+#endif