Made JsonBuffer non-copyable (PR #524 by @luisrayas3)

CHANGELOG.md

@@ -1,6 +1,11 @@
 ArduinoJson: change log
 =======================
 
+HEAD
+----
+
+* Made `JsonBuffer` non-copyable (PR #524 by @luisrayas3)
+
 v5.10.1
 -------
 

src/ArduinoJson/Data/NonCopyable.hpp

@@ -0,0 +1,26 @@
+// Copyright Benoit Blanchon 2014-2017
+// MIT License
+//
+// Arduino JSON library
+// https://bblanchon.github.io/ArduinoJson/
+// If you like this project, please add a star!
+
+#pragma once
+
+namespace ArduinoJson {
+namespace Internals {
+
+// A type that cannot be copied
+class NonCopyable {
+ protected:
+  NonCopyable() {}
+
+ private:
+  // copy constructor is private
+  NonCopyable(const NonCopyable&);
+
+  // copy operator is private
+  NonCopyable& operator=(const NonCopyable&);
+};
+}
+}

src/ArduinoJson/Data/ReferenceType.hpp

@@ -22,16 +22,6 @@ class ReferenceType {
   bool operator!=(const ReferenceType& other) const {
     return this != &other;
   }
-
- protected:
-  ReferenceType() {}
-
- private:
-  // copy constructor is private
-  ReferenceType(const ReferenceType&);
-
-  // copy operator is private
-  ReferenceType& operator=(const ReferenceType&);
 };
 }
 }

src/ArduinoJson/JsonArray.hpp

@@ -39,6 +39,7 @@ class JsonArraySubscript;
 // It can also be deserialized from a JSON string via JsonBuffer::parseArray().
 class JsonArray : public Internals::JsonPrintable<JsonArray>,
                   public Internals::ReferenceType,
+                  public Internals::NonCopyable,
                   public Internals::List<JsonVariant>,
                   public Internals::JsonBufferAllocated {
  public:

src/ArduinoJson/JsonBuffer.hpp

@@ -11,6 +11,7 @@
 #include <stdint.h>  // for uint8_t
 #include <string.h>
 
+#include "Data/NonCopyable.hpp"
 #include "JsonVariant.hpp"
 #include "TypeTraits/EnableIf.hpp"
 #include "TypeTraits/IsArray.hpp"
@@ -34,7 +35,7 @@ class JsonObject;
 // Handle the memory management (done in derived classes) and calls the parser.
 // This abstract class is implemented by StaticJsonBuffer which implements a
 // fixed memory allocation.
-class JsonBuffer {
+class JsonBuffer : Internals::NonCopyable {
  public:
   // CAUTION: NO VIRTUAL DESTRUCTOR!
   // If we add a virtual constructor the Arduino compiler will add malloc() and

src/ArduinoJson/JsonObject.hpp

@@ -38,6 +38,7 @@ class JsonBuffer;
 // It can also be deserialized from a JSON string via JsonBuffer::parseObject().
 class JsonObject : public Internals::JsonPrintable<JsonObject>,
                    public Internals::ReferenceType,
+                   public Internals::NonCopyable,
                    public Internals::List<JsonPair>,
                    public Internals::JsonBufferAllocated {
  public:

test/DynamicJsonBuffer/alloc.cpp

@@ -36,10 +36,10 @@ TEST_CASE("DynamicJsonBuffer::alloc()") {
 
   SECTION("Alignment") {
     // make room for two but not three
-    buffer = DynamicJsonBuffer(2 * sizeof(void*) + 1);
+    DynamicJsonBuffer tinyBuf(2 * sizeof(void*) + 1);
 
-    REQUIRE(isAligned(buffer.alloc(1)));  // this on is aligned by design
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this on is aligned by design
-    REQUIRE(isAligned(buffer.alloc(1)));  // this one fits in the first block
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this one fits in the first block
-    REQUIRE(isAligned(buffer.alloc(1)));  // this one requires a new block
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this one requires a new block
   }
 }