Reserve vectors before pushing and other code quality changes (#11161)

src/client/clientmap.cpp

@@ -499,12 +499,12 @@ int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
 	static v3f z_directions[50] = {
 		v3f(-100, 0, 0)
 	};
-	static f32 z_offsets[sizeof(z_directions)/sizeof(*z_directions)] = {
+	static f32 z_offsets[50] = {
 		-1000,
 	};
 
-	if(z_directions[0].X < -99){
-		for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
+	if (z_directions[0].X < -99) {
+		for (u32 i = 0; i < ARRLEN(z_directions); i++) {
 			// Assumes FOV of 72 and 16/9 aspect ratio
 			z_directions[i] = v3f(
 				0.02 * myrand_range(-100, 100),
@@ -520,7 +520,8 @@ int ClientMap::getBackgroundBrightness(float max_d, u32 daylight_factor,
 	if(sunlight_min_d > 35*BS)
 		sunlight_min_d = 35*BS;
 	std::vector<int> values;
-	for(u32 i=0; i<sizeof(z_directions)/sizeof(*z_directions); i++){
+	values.reserve(ARRLEN(z_directions));
+	for (u32 i = 0; i < ARRLEN(z_directions); i++) {
 		v3f z_dir = z_directions[i];
 		core::CMatrix4<f32> a;
 		a.buildRotateFromTo(v3f(0,1,0), z_dir);

src/client/clouds.cpp

@@ -170,7 +170,7 @@ void Clouds::render()
 
 	// Read noise
 
-	std::vector<char> grid(m_cloud_radius_i * 2 * m_cloud_radius_i * 2); // vector<bool> is broken
+	std::vector<bool> grid(m_cloud_radius_i * 2 * m_cloud_radius_i * 2);
 	std::vector<video::S3DVertex> vertices;
 	vertices.reserve(16 * m_cloud_radius_i * m_cloud_radius_i);
 

src/client/hud.cpp

@@ -336,22 +336,22 @@ void Hud::drawLuaElements(const v3s16 &camera_offset)
 	irr::gui::IGUIFont* font = g_fontengine->getFont();
 
 	// Reorder elements by z_index
-	std::vector<size_t> ids;
+	std::vector<HudElement*> elems;
+	elems.reserve(player->maxHudId());
 
 	for (size_t i = 0; i != player->maxHudId(); i++) {
 		HudElement *e = player->getHud(i);
 		if (!e)
 			continue;
 
-		auto it = ids.begin();
-		while (it != ids.end() && player->getHud(*it)->z_index <= e->z_index)
+		auto it = elems.begin();
+		while (it != elems.end() && (*it)->z_index <= e->z_index)
 			++it;
 
-		ids.insert(it, i);
+		elems.insert(it, e);
 	}
 
-	for (size_t i : ids) {
-		HudElement *e = player->getHud(i);
+	for (HudElement *e : elems) {
 
 		v2s32 pos(floor(e->pos.X * (float) m_screensize.X + 0.5),
 				floor(e->pos.Y * (float) m_screensize.Y + 0.5));
@@ -522,8 +522,8 @@ void Hud::drawLuaElements(const v3s16 &camera_offset)
 				client->getMinimap()->drawMinimap(rect);
 				break; }
 			default:
-				infostream << "Hud::drawLuaElements: ignoring drawform " << e->type <<
-					" of hud element ID " << i << " due to unrecognized type" << std::endl;
+				infostream << "Hud::drawLuaElements: ignoring drawform " << e->type
+					<< " due to unrecognized type" << std::endl;
 		}
 	}
 }

src/client/sky.cpp

@@ -82,13 +82,13 @@ Sky::Sky(s32 id, ITextureSource *tsrc, IShaderSource *ssrc) :
 	// Ensures that sun and moon textures and tonemaps are correct.
 	setSkyDefaults();
 	m_sun_texture = tsrc->isKnownSourceImage(m_sun_params.texture) ?
-		tsrc->getTextureForMesh(m_sun_params.texture) : NULL;
+		tsrc->getTextureForMesh(m_sun_params.texture) : nullptr;
 	m_moon_texture = tsrc->isKnownSourceImage(m_moon_params.texture) ?
-		tsrc->getTextureForMesh(m_moon_params.texture) : NULL;
+		tsrc->getTextureForMesh(m_moon_params.texture) : nullptr;
 	m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
-		tsrc->getTexture(m_sun_params.tonemap) : NULL;
+		tsrc->getTexture(m_sun_params.tonemap) : nullptr;
 	m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
-		tsrc->getTexture(m_moon_params.tonemap) : NULL;
+		tsrc->getTexture(m_moon_params.tonemap) : nullptr;
 
 	if (m_sun_texture) {
 		m_materials[3] = baseMaterial();
@@ -744,14 +744,14 @@ void Sky::place_sky_body(
 	}
 }
 
-void Sky::setSunTexture(std::string sun_texture,
-		std::string sun_tonemap, ITextureSource *tsrc)
+void Sky::setSunTexture(const std::string &sun_texture,
+		const std::string &sun_tonemap, ITextureSource *tsrc)
 {
 	// Ignore matching textures (with modifiers) entirely,
 	// but lets at least update the tonemap before hand.
 	m_sun_params.tonemap = sun_tonemap;
 	m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
-		tsrc->getTexture(m_sun_params.tonemap) : NULL;
+		tsrc->getTexture(m_sun_params.tonemap) : nullptr;
 	m_materials[3].Lighting = !!m_sun_tonemap;
 
 	if (m_sun_params.texture == sun_texture)
@@ -780,7 +780,7 @@ void Sky::setSunTexture(std::string sun_texture,
 	}
 }
 
-void Sky::setSunriseTexture(std::string sunglow_texture,
+void Sky::setSunriseTexture(const std::string &sunglow_texture,
 		ITextureSource* tsrc)
 {
 	// Ignore matching textures (with modifiers) entirely.
@@ -792,14 +792,14 @@ void Sky::setSunriseTexture(std::string sunglow_texture,
 	);
 }
 
-void Sky::setMoonTexture(std::string moon_texture,
-		std::string moon_tonemap, ITextureSource *tsrc)
+void Sky::setMoonTexture(const std::string &moon_texture,
+	const std::string &moon_tonemap, ITextureSource *tsrc)
 {
 	// Ignore matching textures (with modifiers) entirely,
 	// but lets at least update the tonemap before hand.
 	m_moon_params.tonemap = moon_tonemap;
 	m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
-		tsrc->getTexture(m_moon_params.tonemap) : NULL;
+		tsrc->getTexture(m_moon_params.tonemap) : nullptr;
 	m_materials[4].Lighting = !!m_moon_tonemap;
 
 	if (m_moon_params.texture == moon_texture)
@@ -893,7 +893,7 @@ void Sky::setSkyColors(const SkyColor &sky_color)
 }
 
 void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
-		std::string use_sun_tint)
+	const std::string &use_sun_tint)
 {
 	// Change sun and moon tinting:
 	m_sky_params.fog_sun_tint = sun_tint;
@@ -907,7 +907,7 @@ void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
 		m_default_tint = true;
 }
 
-void Sky::addTextureToSkybox(std::string texture, int material_id,
+void Sky::addTextureToSkybox(const std::string &texture, int material_id,
 		ITextureSource *tsrc)
 {
 	// Sanity check for more than six textures.

src/client/sky.h

@@ -65,15 +65,15 @@ class Sky : public scene::ISceneNode
 	}
 
 	void setSunVisible(bool sun_visible) { m_sun_params.visible = sun_visible; }
-	void setSunTexture(std::string sun_texture,
-		std::string sun_tonemap, ITextureSource *tsrc);
+	void setSunTexture(const std::string &sun_texture,
+		const std::string &sun_tonemap, ITextureSource *tsrc);
 	void setSunScale(f32 sun_scale) { m_sun_params.scale = sun_scale; }
 	void setSunriseVisible(bool glow_visible) { m_sun_params.sunrise_visible = glow_visible; }
-	void setSunriseTexture(std::string sunglow_texture, ITextureSource* tsrc);
+	void setSunriseTexture(const std::string &sunglow_texture, ITextureSource* tsrc);
 
 	void setMoonVisible(bool moon_visible) { m_moon_params.visible = moon_visible; }
-	void setMoonTexture(std::string moon_texture,
-		std::string moon_tonemap, ITextureSource *tsrc);
+	void setMoonTexture(const std::string &moon_texture,
+		const std::string &moon_tonemap, ITextureSource *tsrc);
 	void setMoonScale(f32 moon_scale) { m_moon_params.scale = moon_scale; }
 
 	void setStarsVisible(bool stars_visible) { m_star_params.visible = stars_visible; }
@@ -87,21 +87,21 @@ class Sky : public scene::ISceneNode
 	void setVisible(bool visible) { m_visible = visible; }
 	// Set only from set_sky API
 	void setCloudsEnabled(bool clouds_enabled) { m_clouds_enabled = clouds_enabled; }
-	void setFallbackBgColor(const video::SColor &fallback_bg_color)
+	void setFallbackBgColor(video::SColor fallback_bg_color)
 	{
 		m_fallback_bg_color = fallback_bg_color;
 	}
-	void overrideColors(const video::SColor &bgcolor, const video::SColor &skycolor)
+	void overrideColors(video::SColor bgcolor, video::SColor skycolor)
 	{
 		m_bgcolor = bgcolor;
 		m_skycolor = skycolor;
 	}
 	void setSkyColors(const SkyColor &sky_color);
 	void setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
-		std::string use_sun_tint);
+		const std::string &use_sun_tint);
 	void setInClouds(bool clouds) { m_in_clouds = clouds; }
 	void clearSkyboxTextures() { m_sky_params.textures.clear(); }
-	void addTextureToSkybox(std::string texture, int material_id,
+	void addTextureToSkybox(const  std::string &texture, int material_id,
 		ITextureSource *tsrc);
 	const video::SColorf &getCurrentStarColor() const { return m_star_color; }
 
@@ -126,7 +126,7 @@ class Sky : public scene::ISceneNode
 	}
 
 	// Mix two colors by a given amount
-	video::SColor m_mix_scolor(video::SColor col1, video::SColor col2, f32 factor)
+	static video::SColor m_mix_scolor(video::SColor col1, video::SColor col2, f32 factor)
 	{
 		video::SColor result = video::SColor(
 				col1.getAlpha() * (1 - factor) + col2.getAlpha() * factor,
@@ -135,7 +135,7 @@ class Sky : public scene::ISceneNode
 				col1.getBlue() * (1 - factor) + col2.getBlue() * factor);
 		return result;
 	}
-	video::SColorf m_mix_scolorf(video::SColorf col1, video::SColorf col2, f32 factor)
+	static video::SColorf m_mix_scolorf(video::SColorf col1, video::SColorf col2, f32 factor)
 	{
 		video::SColorf result =
 				video::SColorf(col1.r * (1 - factor) + col2.r * factor,

src/clientiface.cpp

@@ -671,7 +671,6 @@ void ClientInterface::UpdatePlayerList()
 		std::vector<session_t> clients = getClientIDs();
 		m_clients_names.clear();
 
-
 		if (!clients.empty())
 			infostream<<"Players:"<<std::endl;
 

src/gui/guiButtonItemImage.cpp

@@ -30,7 +30,7 @@ using namespace gui;
 
 GUIButtonItemImage::GUIButtonItemImage(gui::IGUIEnvironment *environment,
 		gui::IGUIElement *parent, s32 id, core::rect<s32> rectangle,
-		ISimpleTextureSource *tsrc, std::string item, Client *client,
+		ISimpleTextureSource *tsrc, const std::string &item, Client *client,
 		bool noclip)
 		: GUIButton (environment, parent, id, rectangle, tsrc, noclip)
 {
@@ -44,7 +44,7 @@ GUIButtonItemImage::GUIButtonItemImage(gui::IGUIEnvironment *environment,
 
 GUIButtonItemImage *GUIButtonItemImage::addButton(IGUIEnvironment *environment,
 		const core::rect<s32> &rectangle, ISimpleTextureSource *tsrc,
-		IGUIElement *parent, s32 id, const wchar_t *text, std::string item,
+		IGUIElement *parent, s32 id, const wchar_t *text, const std::string &item,
 		Client *client)
 {
 	GUIButtonItemImage *button = new GUIButtonItemImage(environment,

src/gui/guiButtonItemImage.h

@@ -33,13 +33,13 @@ class GUIButtonItemImage : public GUIButton
 	//! constructor
 	GUIButtonItemImage(gui::IGUIEnvironment *environment, gui::IGUIElement *parent,
 			s32 id, core::rect<s32> rectangle, ISimpleTextureSource *tsrc,
-			std::string item, Client *client, bool noclip = false);
+			const std::string &item, Client *client, bool noclip = false);
 
 	//! Do not drop returned handle
 	static GUIButtonItemImage *addButton(gui::IGUIEnvironment *environment,
 			const core::rect<s32> &rectangle, ISimpleTextureSource *tsrc,
-			IGUIElement *parent, s32 id, const wchar_t *text, std::string item,
-			Client *client);
+			IGUIElement *parent, s32 id, const wchar_t *text,
+			const std::string &item, Client *client);
 
 private:
 	Client *m_client;

src/inventory.cpp

@@ -965,13 +965,14 @@ InventoryList * Inventory::getList(const std::string &name)
 {
 	s32 i = getListIndex(name);
 	if(i == -1)
-		return NULL;
+		return nullptr;
 	return m_lists[i];
 }
 
 std::vector<const InventoryList*> Inventory::getLists()
 {
 	std::vector<const InventoryList*> lists;
+	lists.reserve(m_lists.size());
 	for (auto list : m_lists) {
 		lists.push_back(list);
 	}
@@ -990,11 +991,11 @@ bool Inventory::deleteList(const std::string &name)
 	return true;
 }
 
-const InventoryList * Inventory::getList(const std::string &name) const
+const InventoryList *Inventory::getList(const std::string &name) const
 {
 	s32 i = getListIndex(name);
 	if(i == -1)
-		return NULL;
+		return nullptr;
 	return m_lists[i];
 }
 

src/nodedef.cpp

@@ -1544,10 +1544,10 @@ void NodeDefManager::deSerialize(std::istream &is)
 }
 
 
-void NodeDefManager::addNameIdMapping(content_t i, std::string name)
+void NodeDefManager::addNameIdMapping(content_t i, const std::string &name)
 {
 	m_name_id_mapping.set(i, name);
-	m_name_id_mapping_with_aliases.insert(std::make_pair(name, i));
+	m_name_id_mapping_with_aliases.emplace(name, i);
 }
 
 

src/nodedef.h

@@ -725,7 +725,7 @@ class NodeDefManager {
 	 * @param i a content ID
 	 * @param name a node name
 	 */
-	void addNameIdMapping(content_t i, std::string name);
+	void addNameIdMapping(content_t i, const std::string &name);
 
 	/*!
 	 * Removes a content ID from all groups.

src/nodemetadata.cpp

@@ -206,10 +206,9 @@ NodeMetadataList::~NodeMetadataList()
 std::vector<v3s16> NodeMetadataList::getAllKeys()
 {
 	std::vector<v3s16> keys;
-
-	NodeMetadataMap::const_iterator it;
-	for (it = m_data.begin(); it != m_data.end(); ++it)
-		keys.push_back(it->first);
+	keys.reserve(m_data.size());
+	for (const auto &it : m_data)
+		keys.push_back(it.first);
 
 	return keys;
 }
@@ -218,7 +217,7 @@ NodeMetadata *NodeMetadataList::get(v3s16 p)
 {
 	NodeMetadataMap::const_iterator n = m_data.find(p);
 	if (n == m_data.end())
-		return NULL;
+		return nullptr;
 	return n->second;
 }
 
@@ -235,7 +234,7 @@ void NodeMetadataList::remove(v3s16 p)
 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 {
 	remove(p);
-	m_data.insert(std::make_pair(p, d));
+	m_data.emplace(p, d);
 }
 
 void NodeMetadataList::clear()
@@ -251,9 +250,8 @@ void NodeMetadataList::clear()
 int NodeMetadataList::countNonEmpty() const
 {
 	int n = 0;
-	NodeMetadataMap::const_iterator it;
-	for (it = m_data.begin(); it != m_data.end(); ++it) {
-		if (!it->second->empty())
+	for (const auto &it : m_data) {
+		if (!it.second->empty())
 			n++;
 	}
 	return n;

src/pathfinder.cpp

@@ -1428,7 +1428,7 @@ std::string Pathfinder::dirToName(PathDirections dir)
 }
 
 /******************************************************************************/
-void Pathfinder::printPath(std::vector<v3s16> path)
+void Pathfinder::printPath(const std::vector<v3s16> &path)
 {
 	unsigned int current = 0;
 	for (std::vector<v3s16>::iterator i = path.begin();

src/settings.cpp

@@ -43,11 +43,11 @@ std::unordered_map<std::string, const FlagDesc *> Settings::s_flags;
 Settings *Settings::createLayer(SettingsLayer sl, const std::string &end_tag)
 {
 	if ((int)sl < 0 || sl >= SL_TOTAL_COUNT)
-		throw new BaseException("Invalid settings layer");
+		throw BaseException("Invalid settings layer");
 
 	Settings *&pos = s_layers[(size_t)sl];
 	if (pos)
-		throw new BaseException("Setting layer " + std::to_string(sl) + " already exists");
+		throw BaseException("Setting layer " + std::to_string(sl) + " already exists");
 
 	pos = new Settings(end_tag);
 	pos->m_settingslayer = sl;
@@ -638,6 +638,7 @@ std::vector<std::string> Settings::getNames() const
 	MutexAutoLock lock(m_mutex);
 
 	std::vector<std::string> names;
+	names.reserve(m_settings.size());
 	for (const auto &settings_it : m_settings) {
 		names.push_back(settings_it.first);
 	}