Codechange: replace x.size() != 0 with !x.empty()

src/autoreplace_gui.cpp

@@ -222,7 +222,7 @@ class ReplaceVehicleWindow : public Window {
 			/* We need to rebuild the left engines list */
 			this->GenerateReplaceVehList(true);
 			this->vscroll[0]->SetCount(this->engines[0].size());
-			if (this->reset_sel_engine && this->sel_engine[0] == INVALID_ENGINE && this->engines[0].size() != 0) {
+			if (this->reset_sel_engine && this->sel_engine[0] == INVALID_ENGINE && !this->engines[0].empty()) {
 				this->sel_engine[0] = this->engines[0][0].engine_id;
 			}
 		}

src/depot_gui.cpp

@@ -810,7 +810,7 @@ struct DepotWindow : Window {
 
 			case WID_D_SELL_ALL:
 				/* Only open the confirmation window if there are anything to sell */
-				if (this->vehicle_list.size() != 0 || this->wagon_list.size() != 0) {
+				if (!this->vehicle_list.empty() || !this->wagon_list.empty()) {
 					SetDParam(0, this->type);
 					SetDParam(1, this->GetDepotIndex());
 					ShowQuery(

src/gfx_layout_icu.cpp

@@ -132,7 +132,7 @@ ICUParagraphLayout::ICUVisualRun::ICUVisualRun(const ICURun &run, int x) :
 	glyphs(run.glyphs), glyph_to_char(run.glyph_to_char), total_advance(run.total_advance), font(run.font)
 {
 	/* If there are no positions, the ICURun was not Shaped; that should never happen. */
-	assert(run.positions.size() != 0);
+	assert(!run.positions.empty());
 	this->positions.reserve(run.positions.size());
 
 	/* "positions" is an array of x/y. So we need to alternate. */

src/group_gui.cpp

@@ -960,7 +960,7 @@ public:
 				break;
 
 			case WID_GL_MANAGE_VEHICLES_DROPDOWN:
-				assert(this->vehicles.size() != 0);
+				assert(!this->vehicles.empty());
 
 				switch (index) {
 					case ADI_REPLACE: // Replace window

src/network/core/udp.cpp

@@ -50,7 +50,7 @@ bool NetworkUDPSocketHandler::Listen()
 		addr.Listen(SOCK_DGRAM, &this->sockets);
 	}
 
-	return this->sockets.size() != 0;
+	return !this->sockets.empty();
 }
 
 /**

src/network/network_chat_gui.cpp

@@ -67,7 +67,7 @@ static uint8_t *_chatmessage_backup = nullptr; ///< Backup in case text is moved
  */
 static inline bool HaveChatMessages(bool show_all)
 {
-	if (show_all) return _chatmsg_list.size() != 0;
+	if (show_all) return !_chatmsg_list.empty();
 
 	auto now = std::chrono::steady_clock::now();
 	for (auto &cmsg : _chatmsg_list) {

src/newgrf.cpp

@@ -9069,7 +9069,7 @@ static void CalculateRefitMasks()
 			/* Figure out which CTT to use for the default cargo, if it is 'first refittable'. */
 			const GRFFile *file = _gted[engine].defaultcargo_grf;
 			if (file == nullptr) file = e->GetGRF();
-			if (file != nullptr && file->grf_version >= 8 && file->cargo_list.size() != 0) {
+			if (file != nullptr && file->grf_version >= 8 && !file->cargo_list.empty()) {
 				/* Use first refittable cargo from cargo translation table */
 				byte best_local_slot = UINT8_MAX;
 				for (CargoID cargo_type : SetCargoBitIterator(ei->refit_mask)) {

src/newgrf_gui.cpp

@@ -163,7 +163,7 @@ struct NewGRFParametersWindow : public Window {
 		clicked_row(UINT_MAX),
 		editable(editable)
 	{
-		this->action14present = (c->num_valid_params != c->param.size() || c->param_info.size() != 0);
+		this->action14present = (c->num_valid_params != c->param.size() || !c->param_info.empty());
 
 		this->CreateNestedTree();
 		this->vscroll = this->GetScrollbar(WID_NP_SCROLLBAR);

src/string.cpp

@@ -594,7 +594,7 @@ char *strcasestr(const char *haystack, const char *needle)
  */
 static std::string_view SkipGarbage(std::string_view str)
 {
-	while (str.size() != 0 && (str[0] < '0' || IsInsideMM(str[0], ';', '@' + 1) || IsInsideMM(str[0], '[', '`' + 1) || IsInsideMM(str[0], '{', '~' + 1))) str.remove_prefix(1);
+	while (!str.empty() && (str[0] < '0' || IsInsideMM(str[0], ';', '@' + 1) || IsInsideMM(str[0], '[', '`' + 1) || IsInsideMM(str[0], '{', '~' + 1))) str.remove_prefix(1);
 	return str;
 }
 

src/vehicle_gui.cpp

@@ -2080,7 +2080,7 @@ public:
 				break;
 
 			case WID_VL_MANAGE_VEHICLES_DROPDOWN:
-				assert(this->vehicles.size() != 0);
+				assert(!this->vehicles.empty());
 
 				switch (index) {
 					case ADI_REPLACE: // Replace window

src/viewport.cpp

@@ -1747,7 +1747,7 @@ void ViewportDoDraw(const Viewport *vp, int left, int top, int right, int bottom
 
 	DrawTextEffects(&_vd.dpi);
 
-	if (_vd.tile_sprites_to_draw.size() != 0) ViewportDrawTileSprites(&_vd.tile_sprites_to_draw);
+	if (!_vd.tile_sprites_to_draw.empty()) ViewportDrawTileSprites(&_vd.tile_sprites_to_draw);
 
 	for (auto &psd : _vd.parent_sprites_to_draw) {
 		_vd.parent_sprites_to_sort.push_back(&psd);
@@ -1773,7 +1773,7 @@ void ViewportDoDraw(const Viewport *vp, int left, int top, int right, int bottom
 		vp->overlay->Draw(&dp);
 	}
 
-	if (_vd.string_sprites_to_draw.size() != 0) {
+	if (!_vd.string_sprites_to_draw.empty()) {
 		/* translate to world coordinates */
 		dp.left = UnScaleByZoom(_vd.dpi.left, zoom);
 		dp.top = UnScaleByZoom(_vd.dpi.top, zoom);