Removed virtuals from JsonWriter hierarchy

include/ArduinoJson/Internals/CompactJsonWriter.hpp

@@ -15,14 +15,14 @@ class CompactJsonWriter : public JsonWriter {
  public:
   explicit CompactJsonWriter(Print *sink) : JsonWriter(sink) {}
 
-  virtual void beginArray() { _length += _sink->write('['); }
-  virtual void endArray() { _length += _sink->write(']'); }
+  void beginArray() { _length += _sink->write('['); }
+  void endArray() { _length += _sink->write(']'); }
 
-  virtual void beginObject() { _length += _sink->write('{'); }
-  virtual void endObject() { _length += _sink->write('}'); }
+  void beginObject() { _length += _sink->write('{'); }
+  void endObject() { _length += _sink->write('}'); }
 
-  virtual void writeColon() { _length += _sink->write(':'); }
-  virtual void writeComma() { _length += _sink->write(','); }
+  void writeColon() { _length += _sink->write(':'); }
+  void writeComma() { _length += _sink->write(','); }
 };
 }
 }

include/ArduinoJson/Internals/JsonWriter.hpp

@@ -17,12 +17,8 @@ class JsonWriter {
 
   size_t bytesWritten() { return _length; }
 
-  virtual void beginArray() = 0;
-  virtual void endArray() = 0;
   void writeEmptyArray() { _length += _sink->print("[]"); }
 
-  virtual void beginObject() = 0;
-  virtual void endObject() = 0;
   void writeEmptyObject() { _length += _sink->print("{}"); }
 
   void writeString(const char *value);
@@ -30,9 +26,6 @@ class JsonWriter {
   void writeBoolean(bool value);
   void writeDouble(double value, int decimals);
 
-  virtual void writeColon() = 0;
-  virtual void writeComma() = 0;
-
  protected:
   Print *_sink;
   size_t _length;

include/ArduinoJson/Internals/PrettyJsonWriter.hpp

@@ -17,29 +17,29 @@ class PrettyJsonWriter : public JsonWriter {
   explicit PrettyJsonWriter(IndentedPrint *sink)
       : JsonWriter(sink), _indenter(sink) {}
 
-  virtual void beginArray() {
+  void beginArray() {
     _length += _sink->write('[');
     indent();
   }
 
-  virtual void endArray() {
+  void endArray() {
     unindent();
     _length += _sink->write(']');
   }
 
-  virtual void writeColon() { _length += _sink->print(": "); }
+  void writeColon() { _length += _sink->print(": "); }
 
-  virtual void writeComma() {
+  void writeComma() {
     _length += _sink->write(',');
     _length += _indenter->println();
   }
 
-  virtual void beginObject() {
+  void beginObject() {
     _length += _sink->write('{');
     indent();
   }
 
-  virtual void endObject() {
+  void endObject() {
     unindent();
     _length += _sink->write('}');
   }

include/ArduinoJson/JsonPrintable.hpp

@@ -9,18 +9,16 @@
 #include "Arduino/Printable.hpp"
 #include "Internals/StringBuilder.hpp"
 #include "Internals/IndentedPrint.hpp"
+#include "Internals/CompactJsonWriter.hpp"
+#include "Internals/PrettyJsonWriter.hpp"
 
 namespace ArduinoJson {
 
-namespace Internals {
-class IndentedPrint;
-}
-
 template <typename T>
 class JsonPrintable : public Printable {
  public:
   size_t printTo(Print &print) const {
-    CompactJsonWriter writer(&p);
+    Internals::CompactJsonWriter writer(&print);
     downcast().writeTo(writer);
     return writer.bytesWritten();
   }
@@ -30,7 +28,7 @@ class JsonPrintable : public Printable {
   }
 
   size_t prettyPrintTo(Internals::IndentedPrint &print) const {
-    PrettyJsonWriter writer(&p);
+    Internals::PrettyJsonWriter writer(&print);
     downcast().writeTo(writer);
     return writer.bytesWritten();
   }
@@ -45,6 +43,6 @@ class JsonPrintable : public Printable {
   }
 
  private:
-  const T &downcast() { return *static_cast<const T *>(this); }
+  const T &downcast() const { return *static_cast<const T *>(this); }
 };
 }

src/JsonValue.cpp

@@ -7,7 +7,8 @@
 #include "ArduinoJson/JsonValue.hpp"
 #include "ArduinoJson/JsonArray.hpp"
 #include "ArduinoJson/JsonObject.hpp"
-#include "ArduinoJson/Internals/JsonWriter.hpp"
+#include "ArduinoJson/Internals/CompactJsonWriter.hpp"
+#include "ArduinoJson/Internals/PrettyJsonWriter.hpp"
 
 using namespace ArduinoJson;
 using namespace ArduinoJson::Internals;
@@ -74,7 +75,8 @@ void JsonValue::set(JsonObject &object) {
   _content.asObject = &object;
 }
 
-void JsonValue::writeTo(JsonWriter &writer) const {
+template <typename T>
+void JsonValue::writeTo(T &writer) const {
   switch (_type) {
     case JSON_ARRAY:
       _content.asArray->writeTo(writer);
@@ -101,3 +103,6 @@ void JsonValue::writeTo(JsonWriter &writer) const {
       break;
   }
 }
+
+template void JsonValue::writeTo<CompactJsonWriter>(CompactJsonWriter &) const;
+template void JsonValue::writeTo<PrettyJsonWriter>(PrettyJsonWriter &) const;

test/Issue10.cpp

@@ -30,7 +30,8 @@ class Issue10 : public testing::Test {
     persons[1] = employee;
   }
 
-  void checkJsonString(JsonPrintable &p) {
+  template <typename T>
+  void checkJsonString(const T &p) {
     char buffer[256];
     p.printTo(buffer, sizeof(buffer));