Use Print& instead of Print*

include/ArduinoJson/Internals/JsonPrintable.hpp

@@ -21,7 +21,7 @@ template <typename T>
 class JsonPrintable {
  public:
   size_t printTo(Print &print) const {
-    JsonWriter writer(&print);
+    JsonWriter writer(print);
     downcast().writeTo(writer);
     return writer.bytesWritten();
   }
@@ -32,7 +32,7 @@ class JsonPrintable {
   }
 
   size_t prettyPrintTo(IndentedPrint &print) const {
-    PrettyJsonWriter writer(&print);
+    PrettyJsonWriter writer(print);
     downcast().writeTo(writer);
     return writer.bytesWritten();
   }

include/ArduinoJson/Internals/JsonWriter.hpp

@@ -20,7 +20,7 @@ namespace Internals {
 // indentation.
 class JsonWriter {
  public:
-  explicit JsonWriter(Print *sink) : _sink(sink), _length(0) {}
+  explicit JsonWriter(Print &sink) : _sink(sink), _length(0) {}
 
   // Returns the number of bytes sent to the Print implementation.
   // This is very handy for implementations of printTo() that must return the
@@ -44,10 +44,10 @@ class JsonWriter {
   void writeComma() { write(','); }
 
  protected:
-  void write(char c) { _length += _sink->write(c); }
-  void write(const char *s) { _length += _sink->print(s); }
+  void write(char c) { _length += _sink.write(c); }
+  void write(const char *s) { _length += _sink.print(s); }
 
-  Print *_sink;
+  Print &_sink;
   size_t _length;
 };
 }

include/ArduinoJson/Internals/PrettyJsonWriter.hpp

@@ -15,7 +15,7 @@ namespace Internals {
 // An indented version of JsonWriter.
 class PrettyJsonWriter : public JsonWriter {
  public:
-  explicit PrettyJsonWriter(IndentedPrint *sink)
+  explicit PrettyJsonWriter(IndentedPrint &sink)
       : JsonWriter(sink), _indenter(sink) {}
 
   void beginArray() {
@@ -47,18 +47,18 @@ class PrettyJsonWriter : public JsonWriter {
 
  private:
   void indent() {
-    _indenter->indent();
+    _indenter.indent();
     newline();
   }
 
   void unindent() {
     newline();
-    _indenter->unindent();
+    _indenter.unindent();
   }
 
-  void newline() { _length += _indenter->println(); }
+  void newline() { _length += _indenter.println(); }
 
-  IndentedPrint *_indenter;
+  IndentedPrint &_indenter;
 };
 }
 }

include/ArduinoJson/Internals/QuotedString.hpp

@@ -17,7 +17,7 @@ class QuotedString {
   // Writes a doubly-quote string to a Print implementation.
   // It adds the double quotes (") at the beginning and the end of the string.
   // It escapes the special characters as required by the JSON specifications.
-  static size_t printTo(const char *, Print *);
+  static size_t printTo(const char *, Print &);
 
   // Reads a doubly-quoted string from a buffer.
   // It removes the double quotes (").