Keep track of Link objects using unique_ptr

This ensures the memory is freed when the pointers are removed. While
there was an explicit delete loop in the destructor, memory leaks could
occur when links were removed from the menu.

src/menu.cpp

@@ -104,8 +104,8 @@ Menu::Menu(GMenu2X& gmenu2x, Touchscreen &ts)
 	btnContextMenu.setPosition(gmenu2x.resX - 38, gmenu2x.bottomBarIconY);
 }
 
-Menu::~Menu() {
+Menu::~Menu()
-	freeLinks();
+{
 }
 
 void Menu::readSections(std::string const& parentDir)
@@ -151,11 +151,11 @@ void Menu::skinUpdated() {
 	linkRows = (gmenu2x.resY - 35 - skinConfInt["topBarHeight"]) / skinConfInt["linkHeight"];
 
 	//reload section icons
-	vector<string>::size_type i = 0;
+	decltype(links)::size_type i = 0;
-	for (string sectionName : sections) {
+	for (auto& sectionName : sections) {
 		gmenu2x.sc["skin:sections/" + sectionName + ".png"];
 
-		for (Link *&link : links[i]) {
+		for (auto& link : links[i]) {
 			link->loadIcon();
 		}
 
@@ -233,8 +233,8 @@ void Menu::paint(Surface &s) {
 	sc.skinRes("imgs/section-l.png")->blit(s, 0, 0);
 	sc.skinRes("imgs/section-r.png")->blit(s, width - 10, 0);
 
-	vector<Link*> &sectionLinks = links[iSection];
+	auto& sectionLinks = links[iSection];
-	const uint numLinks = sectionLinks.size();
+	auto numLinks = sectionLinks.size();
 	gmenu2x.drawScrollBar(
 			linkRows, (numLinks + linkColumns - 1) / linkColumns, iFirstDispRow);
 
@@ -353,18 +353,16 @@ bool Menu::handleTouchscreen(Touchscreen &ts) {
 /*====================================
    SECTION MANAGEMENT
   ====================================*/
-void Menu::freeLinks() {
-	for (vector< vector<Link*> >::iterator section = links.begin(); section<links.end(); section++)
-		for (vector<Link*>::iterator link = section->begin(); link<section->end(); link++)
-			delete *link;
-}
 
-vector<Link*> *Menu::sectionLinks(int i) {
+vector<unique_ptr<Link>> *Menu::sectionLinks(int i)
-	if (i<0 || i>=(int)links.size())
+{
+	if (i<0 || i>=(int)links.size()) {
 		i = selSectionIndex();
+	}
 
-	if (i<0 || i>=(int)links.size())
+	if (i<0 || i>=(int)links.size()) {
-		return NULL;
+		return nullptr;
+	}
 
 	return &links[i];
 }
@@ -417,7 +415,7 @@ void Menu::addActionLink(uint section, string const& title, Action action,
 		link->setIcon(icon);
 	}
 
-	links[section].push_back(link);
+	links[section].emplace_back(link);
 }
 
 bool Menu::addLink(string const& path, string const& file)
@@ -501,7 +499,7 @@ bool Menu::addLink(string const& path, string const& file)
 		auto idx = sectionNamed(sectionName);
 		auto link = new LinkApp(gmenu2x, linkpath, true);
 		link->setSize(gmenu2x.skinConfInt["linkWidth"], gmenu2x.skinConfInt["linkHeight"]);
-		links[idx].push_back(link);
+		links[idx].emplace_back(link);
 	} else {
 
 		ERROR("Error while opening the file '%s' for write.\n", linkpath.c_str());
@@ -525,7 +523,6 @@ int Menu::sectionNamed(const char *sectionName)
 
 void Menu::deleteSelectedLink()
 {
-	bool icon_used = false;
 	string iconpath = selLink()->getIconPath();
 
 	INFO("Deleting link '%s'\n", selLink()->getTitle().c_str());
@@ -535,14 +532,17 @@ void Menu::deleteSelectedLink()
 	sectionLinks()->erase( sectionLinks()->begin() + selLinkIndex() );
 	setLinkIndex(selLinkIndex());
 
-	for (vector< vector<Link*> >::iterator section = links.begin();
+	bool icon_used = false;
-				!icon_used && section<links.end(); section++)
+	for (auto& section : links) {
-		for (vector<Link*>::iterator link = section->begin();
+		for (auto& link : section) {
-					!icon_used && link<section->end(); link++)
+			if (iconpath == link->getIconPath()) {
-			icon_used = iconpath == (*link)->getIconPath();
+				icon_used = true;
-
+			}
-	if (!icon_used)
+		}
-	  gmenu2x.sc.del(iconpath);
+	}
+	if (!icon_used) {
+		gmenu2x.sc.del(iconpath);
+	}
 }
 
 void Menu::deleteSelectedSection() {
@@ -555,15 +555,26 @@ void Menu::deleteSelectedSection() {
 }
 
 bool Menu::linkChangeSection(uint linkIndex, uint oldSectionIndex, uint newSectionIndex) {
-	if (oldSectionIndex<sections.size() && newSectionIndex<sections.size() && linkIndex<sectionLinks(oldSectionIndex)->size()) {
+	// Fetch sections.
-		sectionLinks(newSectionIndex)->push_back( sectionLinks(oldSectionIndex)->at(linkIndex) );
+	auto oldSectionLinks = sectionLinks(oldSectionIndex);
-		sectionLinks(oldSectionIndex)->erase( sectionLinks(oldSectionIndex)->begin()+linkIndex );
+	if (!oldSectionLinks) return false;
-		//Select the same link in the new position
+	auto newSectionLinks = sectionLinks(newSectionIndex);
-		setSectionIndex(newSectionIndex);
+	if (!newSectionLinks) return false;
-		setLinkIndex(sectionLinks(newSectionIndex)->size()-1);
+
-		return true;
+	// Find link in old section.
-	}
+	if (linkIndex >= oldSectionLinks->size()) return false;
-	return false;
+	auto it = oldSectionLinks->begin() + linkIndex;
+
+	// Move link.
+	auto link = it->release();
+	oldSectionLinks->erase(it);
+	newSectionLinks->emplace_back(link);
+
+	// Select the same link in the new section.
+	setSectionIndex(newSectionIndex);
+	setLinkIndex(newSectionLinks->size() - 1);
+
+	return true;
 }
 
 void Menu::linkLeft() {
@@ -615,8 +626,12 @@ int Menu::selLinkIndex() {
 }
 
 Link *Menu::selLink() {
-	if (sectionLinks()->size()==0) return NULL;
+	auto curSectionLinks = sectionLinks();
-	return sectionLinks()->at(iLink);
+	if (curSectionLinks->empty()) {
+		return nullptr;
+	} else {
+		return curSectionLinks->at(iLink).get();
+	}
 }
 
 LinkApp *Menu::selLinkApp() {
@@ -705,7 +720,7 @@ void Menu::openPackage(std::string const& path, bool order)
 		link->setSize(gmenu2x.skinConfInt["linkWidth"], gmenu2x.skinConfInt["linkHeight"]);
 
 		auto idx = sectionNamed(link->getCategory());
-		links[idx].push_back(link);
+		links[idx].emplace_back(link);
 	}
 
 	opk_close(opk);
@@ -753,11 +768,9 @@ bool Menu::readPackages(std::string const& parentDir)
  * correspond to an OPK present in the directory. */
 void Menu::removePackageLink(std::string const& path)
 {
-	for (vector< vector<Link*> >::iterator section = links.begin();
+	for (auto section = links.begin(); section != links.end(); ++section) {
-				section < links.end(); section++) {
+		for (auto link = section->begin(); link != section->end(); ++link) {
-		for (vector<Link*>::iterator link = section->begin();
+			LinkApp *app = dynamic_cast<LinkApp *>(link->get());
-					link < section->end(); link++) {
-			LinkApp *app = dynamic_cast<LinkApp *> (*link);
 			if (!app || !app->isOpk() || app->getOpkFile().empty())
 				continue;
 
@@ -766,9 +779,10 @@ void Menu::removePackageLink(std::string const& path)
 							app->getOpkFile().c_str());
 				section->erase(link);
 				if (section - links.begin() == iSection
-							&& iLink == (int) section->size())
+							&& iLink == (int) section->size()) {
 					setLinkIndex(iLink - 1);
-				link--;
+				}
+				--link;
 			}
 		}
 	}
@@ -783,17 +797,19 @@ void Menu::removePackageLink(std::string const& path)
 #endif
 #endif
 
-static bool compare_links(Link *a, Link *b)
+static bool compare_links(unique_ptr<Link> const& a, unique_ptr<Link> const& b)
 {
-	LinkApp *app1 = dynamic_cast<LinkApp *>(a);
+	LinkApp *app1 = dynamic_cast<LinkApp *>(a.get());
-	LinkApp *app2 = dynamic_cast<LinkApp *>(b);
+	LinkApp *app2 = dynamic_cast<LinkApp *>(b.get());
 	bool app1_is_opk = app1 && app1->isOpk(),
 		 app2_is_opk = app2 && app2->isOpk();
 
-	if (app1_is_opk && !app2_is_opk)
+	if (app1_is_opk && !app2_is_opk) {
-			return false;
+		return false;
-	if (app2_is_opk && !app1_is_opk)
+	}
-			return true;
+	if (app2_is_opk && !app1_is_opk) {
+		return true;
+	}
 	return a->getTitle().compare(b->getTitle()) < 0;
 }
 
@@ -825,7 +841,7 @@ void Menu::readLinks()
 }
 
 void Menu::readLinksOfSection(
-		vector<Link*>& links, string const& path, bool deletable)
+		vector<unique_ptr<Link>>& links, string const& path, bool deletable)
 {
 	DIR *dirp = opendir(path.c_str());
 	if (!dirp) return;
@@ -839,7 +855,7 @@ void Menu::readLinksOfSection(
 			link->setSize(
 					gmenu2x.skinConfInt["linkWidth"],
 					gmenu2x.skinConfInt["linkHeight"]);
-			links.push_back(link);
+			links.emplace_back(link);
 		} else {
 			delete link;
 		}

src/menu.h

@@ -60,7 +60,7 @@ private:
 	int iSection, iLink;
 	uint iFirstDispRow;
 	std::vector<std::string> sections;
-	std::vector<std::vector<Link*>> links;
+	std::vector<std::vector<std::unique_ptr<Link>>> links;
 
 	uint linkColumns, linkRows;
 
@@ -72,7 +72,7 @@ private:
 	 */
 	void calcSectionRange(int &leftSection, int &rightSection);
 
-	std::vector<Link*> *sectionLinks(int i = -1);
+	std::vector<std::unique_ptr<Link>> *sectionLinks(int i = -1);
 
 	void readLinks();
 	void freeLinks();
@@ -89,7 +89,7 @@ private:
 #endif
 
 	// Load all the links on the given section directory.
-	void readLinksOfSection(std::vector<Link*>& links,
+	void readLinksOfSection(std::vector<std::unique_ptr<Link>>& links,
 							std::string const& path, bool deletable);
 
 	/**