drop StreamWriterBuilderFactory, for now

include/json/writer.h

@@ -30,26 +30,20 @@ Usage:
 
   using namespace Json;
   Value value;
-  StreamWriterBuilderFactory f;
+  StreamWriter::Builder builder;
-  StreamWriter::Builder builder(&f);
   builder.setCommentStyle(StreamWriter::CommentStyle::None);
   std::shared_ptr<StreamWriter> writer(
     builder.newStreamWriter(&std::cout));
   writer->write(value);
   std::cout.flush();
 */
-class JSON_API StreamWriterBuilderFactory {
-public:
-  virtual ~StreamWriterBuilderFactory();
-  virtual StreamWriterBuilder* newStreamWriterBuilder() const;
-};
-
 class JSON_API StreamWriter {
 protected:
   std::ostream& sout_;  // not owned; will not delete
 public:
   enum class CommentStyle {None, Some, All};
 
+  /// Keep a reference, but do not take ownership of `sout`.
   StreamWriter(std::ostream* sout);
   virtual ~StreamWriter();
   /// Write Value into document as configured in sub-class.
@@ -62,8 +56,10 @@ public:
   /// \see http://stackoverflow.com/questions/14875052/pure-virtual-functions-and-binary-compatibility
   class Builder {
     StreamWriterBuilder* own_;
+    Builder(Builder const&);  // noncopyable
+    void operator=(Builder const&);  // noncopyable
   public:
-    Builder(StreamWriterBuilderFactory const*);
+    Builder();
     ~Builder();  // delete underlying StreamWriterBuilder
 
     void setCommentStyle(CommentStyle cs);  /// default: All

src/jsontestrunner/main.cpp

@@ -184,8 +184,7 @@ static std::string useStyledStreamWriter(
 static std::string useBuiltStyledStreamWriter(
     Json::Value const& root)
 {
-  Json::StreamWriterBuilderFactory f;
+  Json::StreamWriter::Builder builder;
-  Json::StreamWriter::Builder builder(&f);
   builder.setCommentStyle(Json::StreamWriter::CommentStyle::All);
   return writeString(root, builder);
 }

src/lib_json/json_writer.cpp

@@ -967,6 +967,13 @@ StreamWriter* StreamWriterBuilder::newStreamWriter(std::ostream* stream) const
 {
   return new BuiltStyledStreamWriter(stream, indentation_, cs_);
 }
+
+// This might become public someday.
+class StreamWriterBuilderFactory {
+public:
+  virtual ~StreamWriterBuilderFactory();
+  virtual StreamWriterBuilder* newStreamWriterBuilder() const;
+};
 StreamWriterBuilderFactory::~StreamWriterBuilderFactory()
 {
 }
@@ -975,14 +982,19 @@ StreamWriterBuilder* StreamWriterBuilderFactory::newStreamWriterBuilder() const
   return new StreamWriterBuilder;
 }
 
-StreamWriter::Builder::Builder(StreamWriterBuilderFactory const* f)
+StreamWriter::Builder::Builder()
-    : own_(f->newStreamWriterBuilder())
+    : own_(StreamWriterBuilderFactory().newStreamWriterBuilder())
 {
 }
 StreamWriter::Builder::~Builder()
 {
   delete own_;
 }
+StreamWriter::Builder::Builder(Builder const&)
+  : own_(nullptr)
+{abort();}
+void StreamWriter::Builder::operator=(Builder const&)
+{abort();}
 void StreamWriter::Builder::setCommentStyle(CommentStyle v)
 {
   own_->setCommentStyle(v);
@@ -1006,8 +1018,7 @@ std::string writeString(Value const& root, StreamWriter::Builder const& builder)
 }
 
 std::ostream& operator<<(std::ostream& sout, Value const& root) {
-  StreamWriterBuilderFactory f;
+  StreamWriter::Builder builder;
-  StreamWriter::Builder builder(&f);
   builder.setCommentStyle(StreamWriter::CommentStyle::All);
   std::shared_ptr<StreamWriter> writer(builder.newStreamWriter(&sout));
   writer->write(root);