Add IDocumentEditable interface for efficient interaction with document objects.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/Document.cxx b/src/Document.cxx
index dcb087930..d67cac25e 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -184,7 +184,7 @@ Document::~Document() {
 }
 
 // Increase reference count and return its previous value.
-int Document::AddRef() {
+int SCI_METHOD Document::AddRef() noexcept {
 	return refCount++;
 }
 
@@ -461,6 +461,10 @@ Sci_Position SCI_METHOD Document::LineEnd(Sci_Position line) const {
 	return cb.LineEnd(line);
 }
 
+int SCI_METHOD Document::DEVersion() const noexcept {
+	return deRelease0;
+}
+
 void SCI_METHOD Document::SetErrorStatus(int status) {
 	// Tell the watchers an error has occurred.
 	for (const WatcherWithUserData &watcher : watchers) {
@@ -1341,8 +1345,12 @@ int SCI_METHOD Document::AddData(const char *data, Sci_Position length) {
 	return static_cast<int>(Status::Ok);
 }
 
+IDocumentEditable *Document::AsDocumentEditable() noexcept {
+	return static_cast<IDocumentEditable *>(this);
+}
+
 void * SCI_METHOD Document::ConvertToDocument() {
-	return this;
+	return AsDocumentEditable();
 }
 
 Sci::Position Document::Undo() {