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arduino-cli/libraries/ArduinoJson_6.x/ArduinoJson/Variant/VariantSlot.hpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Polyfills/integer.hpp>
+#include <ArduinoJson/Polyfills/limits.hpp>
+#include <ArduinoJson/Polyfills/type_traits.hpp>
+#include <ArduinoJson/Strings/StoragePolicy.hpp>
+#include <ArduinoJson/Variant/VariantContent.hpp>
+
+namespace ARDUINOJSON_NAMESPACE {
+
+typedef int_t<ARDUINOJSON_SLOT_OFFSET_SIZE * 8>::type VariantSlotDiff;
+
+class VariantSlot {
+  // CAUTION: same layout as VariantData
+  // we cannot use composition because it adds padding
+  // (+20% on ESP8266 for example)
+  VariantContent _content;
+  uint8_t _flags;
+  VariantSlotDiff _next;
+  const char* _key;
+
+ public:
+  // Must be a POD!
+  // - no constructor
+  // - no destructor
+  // - no virtual
+  // - no inheritance
+
+  VariantData* data() {
+    return reinterpret_cast<VariantData*>(&_content);
+  }
+
+  const VariantData* data() const {
+    return reinterpret_cast<const VariantData*>(&_content);
+  }
+
+  VariantSlot* next() {
+    return _next ? this + _next : 0;
+  }
+
+  const VariantSlot* next() const {
+    return const_cast<VariantSlot*>(this)->next();
+  }
+
+  VariantSlot* next(size_t distance) {
+    VariantSlot* slot = this;
+    while (distance--) {
+      if (!slot->_next)
+        return 0;
+      slot += slot->_next;
+    }
+    return slot;
+  }
+
+  const VariantSlot* next(size_t distance) const {
+    return const_cast<VariantSlot*>(this)->next(distance);
+  }
+
+  void setNext(VariantSlot* slot) {
+    ARDUINOJSON_ASSERT(!slot || slot - this >=
+                                    numeric_limits<VariantSlotDiff>::lowest());
+    ARDUINOJSON_ASSERT(!slot || slot - this <=
+                                    numeric_limits<VariantSlotDiff>::highest());
+    _next = VariantSlotDiff(slot ? slot - this : 0);
+  }
+
+  void setNextNotNull(VariantSlot* slot) {
+    ARDUINOJSON_ASSERT(slot != 0);
+    ARDUINOJSON_ASSERT(slot - this >=
+                       numeric_limits<VariantSlotDiff>::lowest());
+    ARDUINOJSON_ASSERT(slot - this <=
+                       numeric_limits<VariantSlotDiff>::highest());
+    _next = VariantSlotDiff(slot - this);
+  }
+
+  void setKey(const char* k, storage_policies::store_by_copy) {
+    ARDUINOJSON_ASSERT(k != NULL);
+    _flags |= KEY_IS_OWNED;
+    _key = k;
+  }
+
+  void setKey(const char* k, storage_policies::store_by_address) {
+    ARDUINOJSON_ASSERT(k != NULL);
+    _flags &= VALUE_MASK;
+    _key = k;
+  }
+
+  const char* key() const {
+    return _key;
+  }
+
+  bool ownsKey() const {
+    return (_flags & KEY_IS_OWNED) != 0;
+  }
+
+  void clear() {
+    _next = 0;
+    _flags = 0;
+    _key = 0;
+  }
+
+  void movePointers(ptrdiff_t stringDistance, ptrdiff_t variantDistance) {
+    if (_flags & KEY_IS_OWNED)
+      _key += stringDistance;
+    if (_flags & VALUE_IS_OWNED)
+      _content.asString += stringDistance;
+    if (_flags & COLLECTION_MASK)
+      _content.asCollection.movePointers(stringDistance, variantDistance);
+  }
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE