初始化

lib/ArduinoJson/src/ArduinoJson/Document/StaticJsonDocument.hpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#pragma once
+
+#include <ArduinoJson/Document/JsonDocument.hpp>
+
+ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
+
+// A JsonDocument with a memory pool on the stack.
+template <size_t desiredCapacity>
+class StaticJsonDocument : public JsonDocument {
+  static const size_t _capacity =
+      detail::AddPadding<detail::Max<1, desiredCapacity>::value>::value;
+
+ public:
+  StaticJsonDocument() : JsonDocument(_buffer, _capacity) {}
+
+  StaticJsonDocument(const StaticJsonDocument& src)
+      : JsonDocument(_buffer, _capacity) {
+    set(src);
+  }
+
+  template <typename T>
+  StaticJsonDocument(
+      const T& src,
+      typename detail::enable_if<
+          detail::is_convertible<T, JsonVariantConst>::value>::type* = 0)
+      : JsonDocument(_buffer, _capacity) {
+    set(src);
+  }
+
+  // disambiguate
+  StaticJsonDocument(JsonVariant src) : JsonDocument(_buffer, _capacity) {
+    set(src);
+  }
+
+  StaticJsonDocument& operator=(const StaticJsonDocument& src) {
+    set(src);
+    return *this;
+  }
+
+  template <typename T>
+  StaticJsonDocument& operator=(const T& src) {
+    set(src);
+    return *this;
+  }
+
+  // Reclaims the memory leaked when removing and replacing values.
+  // https://arduinojson.org/v6/api/jsondocument/garbagecollect/
+  void garbageCollect() {
+    StaticJsonDocument tmp(*this);
+    set(tmp);
+  }
+
+ private:
+  char _buffer[_capacity];
+};
+
+ARDUINOJSON_END_PUBLIC_NAMESPACE