Simplify and speed up AssFile's copy constructor and assignment operator.

Originally committed to SVN as r4565.

aegisub/src/ass_dialogue.cpp

@@ -33,8 +33,6 @@
 /// @brief Class for dialogue lines in subtitles
 /// @ingroup subs_storage
 
-////////////
-// Includes
 #include "config.h"
 
 #ifndef AGI_PRE
@@ -66,7 +64,8 @@ AssDialogue::AssDialogue()
 }
 
 AssDialogue::AssDialogue(AssDialogue const& that)
-: Comment(that.Comment)
+: AssEntry()
+, Comment(that.Comment)
 , Layer(that.Layer)
 , Start(that.Start)
 , End(that.End)

aegisub/src/ass_file.cpp

@@ -36,6 +36,7 @@
 #include "config.h"
 
 #ifndef AGI_PRE
+#include <algorithm>
 #include <fstream>
 #include <list>
 
@@ -450,18 +451,18 @@ void AssFile::LoadDefault (bool defline) {
 	loaded = true;
 }
 
-AssFile::AssFile (AssFile &from) {
-	using std::list;
-
-	// Copy standard variables
+AssFile::AssFile (const AssFile &from) {
 	filename = from.filename;
 	loaded = from.loaded;
 	Modified = from.Modified;
-
-	// Copy lines
-	for (list<AssEntry*>::iterator cur=from.Line.begin();cur!=from.Line.end();cur++) {
-		Line.push_back((*cur)->Clone());
+	std::transform(from.Line.begin(), from.Line.end(), std::back_inserter(Line), std::mem_fun(&AssEntry::Clone));
 }
+AssFile& AssFile::operator=(AssFile from) {
+	filename = from.filename;
+	loaded = from.loaded;
+	Modified = from.Modified;
+	std::swap(Line, from.Line);
+	return *this;
 }
 
 void AssFile::InsertStyle (AssStyle *style) {

aegisub/src/ass_file.h

@@ -90,7 +90,8 @@ public:
 	bool loaded;
 
 	AssFile();
-	AssFile(AssFile &from);
+	AssFile(const AssFile &from);
+	AssFile& operator=(AssFile from);
 	~AssFile();
 
 	/// Does the file have unsaved changes?