diff --git a/source/blender/blenkernel/BKE_grease_pencil.hh b/source/blender/blenkernel/BKE_grease_pencil.hh
index 467272bb1bf..dfc0e363196 100644
--- a/source/blender/blenkernel/BKE_grease_pencil.hh
+++ b/source/blender/blenkernel/BKE_grease_pencil.hh
@@ -656,7 +656,7 @@ inline TreeNode &Layer::as_node()
 TREENODE_COMMON_METHODS_FORWARD_IMPL(Layer);
 inline bool Layer::is_empty() const
 {
-  return (this->frames().size() == 0);
+  return (this->frames().is_empty());
 }
 inline LayerGroup &Layer::parent_group() const
 {
diff --git a/source/blender/blenkernel/BKE_pbvh_pixels.hh b/source/blender/blenkernel/BKE_pbvh_pixels.hh
index 0e4e37604fd..5ca3f17a1e3 100644
--- a/source/blender/blenkernel/BKE_pbvh_pixels.hh
+++ b/source/blender/blenkernel/BKE_pbvh_pixels.hh
@@ -200,7 +200,7 @@ struct NodeData {
   {
     undo_regions.clear();
     for (UDIMTilePixels &tile : tiles) {
-      if (tile.pixel_rows.size() == 0) {
+      if (tile.pixel_rows.is_empty()) {
         continue;
       }
 
diff --git a/source/blender/blenkernel/intern/geometry_component_mesh.cc b/source/blender/blenkernel/intern/geometry_component_mesh.cc
index 2734e2b5b1d..499e91c33c7 100644
--- a/source/blender/blenkernel/intern/geometry_component_mesh.cc
+++ b/source/blender/blenkernel/intern/geometry_component_mesh.cc
@@ -776,7 +776,7 @@ static GVArray adapt_mesh_attribute_domain(const Mesh &mesh,
   if (!varray) {
     return {};
   }
-  if (varray.size() == 0) {
+  if (varray.is_empty()) {
     return {};
   }
   if (from_domain == to_domain) {
diff --git a/source/blender/blenkernel/intern/grease_pencil.cc b/source/blender/blenkernel/intern/grease_pencil.cc
index b8bb5411b8f..736fa24d815 100644
--- a/source/blender/blenkernel/intern/grease_pencil.cc
+++ b/source/blender/blenkernel/intern/grease_pencil.cc
@@ -771,7 +771,7 @@ FramesMapKey Layer::frame_key_at(const int frame_number) const
 {
   Span<int> sorted_keys = this->sorted_keys();
   /* No keyframes, return no drawing. */
-  if (sorted_keys.size() == 0) {
+  if (sorted_keys.is_empty()) {
     return -1;
   }
   /* Before the first drawing, return no drawing. */
@@ -1661,7 +1661,7 @@ static void remove_drawings_unchecked(GreasePencil &grease_pencil,
                                       Span<int64_t> sorted_indices_to_remove)
 {
   using namespace blender::bke::greasepencil;
-  if (grease_pencil.drawing_array_num == 0 || sorted_indices_to_remove.size() == 0) {
+  if (grease_pencil.drawing_array_num == 0 || sorted_indices_to_remove.is_empty()) {
     return;
   }
   const int64_t drawings_to_remove = sorted_indices_to_remove.size();
diff --git a/source/blender/blenkernel/intern/grease_pencil_convert_legacy.cc b/source/blender/blenkernel/intern/grease_pencil_convert_legacy.cc
index 058cee519e8..2b1cf683e12 100644
--- a/source/blender/blenkernel/intern/grease_pencil_convert_legacy.cc
+++ b/source/blender/blenkernel/intern/grease_pencil_convert_legacy.cc
@@ -112,7 +112,7 @@ void legacy_gpencil_frame_to_grease_pencil_drawing(const bGPDframe &gpf,
 
     /* Write point attributes. */
     IndexRange stroke_points_range = points_by_curve[stroke_i];
-    if (stroke_points_range.size() == 0) {
+    if (stroke_points_range.is_empty()) {
       continue;
     }
 
diff --git a/source/blender/blenkernel/intern/mesh_boolean_convert.cc b/source/blender/blenkernel/intern/mesh_boolean_convert.cc
index 21206818757..b651ba4848f 100644
--- a/source/blender/blenkernel/intern/mesh_boolean_convert.cc
+++ b/source/blender/blenkernel/intern/mesh_boolean_convert.cc
@@ -817,7 +817,7 @@ Mesh *direct_mesh_boolean(Span<const Mesh *> meshes,
 {
 #ifdef WITH_GMP
   BLI_assert(transforms.is_empty() || meshes.size() == transforms.size());
-  BLI_assert(material_remaps.size() == 0 || material_remaps.size() == meshes.size());
+  BLI_assert(material_remaps.is_empty() || material_remaps.size() == meshes.size());
   if (meshes.size() <= 0) {
     return nullptr;
   }
diff --git a/source/blender/blenkernel/intern/mesh_mapping.cc b/source/blender/blenkernel/intern/mesh_mapping.cc
index 2821495ceab..cf0da5c28ad 100644
--- a/source/blender/blenkernel/intern/mesh_mapping.cc
+++ b/source/blender/blenkernel/intern/mesh_mapping.cc
@@ -506,7 +506,7 @@ static void face_edge_loop_islands_calc(const int totedge,
   int tot_group = 0;
   bool group_id_overflow = false;
 
-  if (faces.size() == 0) {
+  if (faces.is_empty()) {
     *r_totgroup = 0;
     *r_face_groups = nullptr;
     if (r_edge_borders) {
diff --git a/source/blender/blenkernel/intern/mesh_tessellate.cc b/source/blender/blenkernel/intern/mesh_tessellate.cc
index f2f3e047b90..f069d216c5f 100644
--- a/source/blender/blenkernel/intern/mesh_tessellate.cc
+++ b/source/blender/blenkernel/intern/mesh_tessellate.cc
@@ -318,7 +318,7 @@ void looptris_calc_with_normals(const Span<float3> vert_positions,
                                 const Span<float3> face_normals,
                                 MutableSpan<MLoopTri> looptris)
 {
-  BLI_assert(!face_normals.is_empty() || faces.size() == 0);
+  BLI_assert(!face_normals.is_empty() || faces.is_empty());
   looptris_calc_all(vert_positions, faces, corner_verts, face_normals, looptris);
 }
 
diff --git a/source/blender/blenlib/intern/delaunay_2d.cc b/source/blender/blenlib/intern/delaunay_2d.cc
index af859a25c9d..3d472972da2 100644
--- a/source/blender/blenlib/intern/delaunay_2d.cc
+++ b/source/blender/blenlib/intern/delaunay_2d.cc
@@ -496,7 +496,7 @@ template<typename T> void cdt_draw(const std::string &label, const CDTArrangemen
   constexpr bool draw_edge_labels = false;
   constexpr bool draw_face_labels = false;
 
-  if (cdt.verts.size() == 0) {
+  if (cdt.verts.is_empty()) {
     return;
   }
   vec2<double> vmin(DBL_MAX, DBL_MAX);
diff --git a/source/blender/blenlib/intern/mesh_boolean.cc b/source/blender/blenlib/intern/mesh_boolean.cc
index a1c6dfde7a6..194358c228b 100644
--- a/source/blender/blenlib/intern/mesh_boolean.cc
+++ b/source/blender/blenlib/intern/mesh_boolean.cc
@@ -981,7 +981,7 @@ static Array<int> sort_tris_around_edge(
    * be only 3 or 4 - so OK to make copies of arrays instead of swapping
    * around in a single array. */
   const int dbg_level = 0;
-  if (tris.size() == 0) {
+  if (tris.is_empty()) {
     return Array<int>();
   }
   if (dbg_level > 0) {
@@ -1306,7 +1306,7 @@ static bool patch_cell_graph_ok(const CellsInfo &cinfo, const PatchesInfo &pinfo
     if (cell.merged_to() != NO_INDEX) {
       continue;
     }
-    if (cell.patches().size() == 0) {
+    if (cell.patches().is_empty()) {
       std::cout << "Patch/Cell graph disconnected at Cell " << c << " with no patches\n";
       return false;
     }
@@ -2132,7 +2132,7 @@ static void finish_patch_cell_graph(const IMesh &tm,
   /* For nested components, merge their ambient cell with the nearest containing cell. */
   Vector<int> outer_components;
   for (int comp : comp_cont.index_range()) {
-    if (comp_cont[comp].size() == 0) {
+    if (comp_cont[comp].is_empty()) {
       outer_components.append(comp);
     }
     else {
@@ -3217,7 +3217,7 @@ static void do_dissolve(FaceMergeState *fms)
       dissolve_edges.append(e);
     }
   }
-  if (dissolve_edges.size() == 0) {
+  if (dissolve_edges.is_empty()) {
     return;
   }
   /* Things look nicer if we dissolve the longer edges first. */
diff --git a/source/blender/blenlib/intern/mesh_intersect.cc b/source/blender/blenlib/intern/mesh_intersect.cc
index 674e00143d0..574659b4ec8 100644
--- a/source/blender/blenlib/intern/mesh_intersect.cc
+++ b/source/blender/blenlib/intern/mesh_intersect.cc
@@ -2126,7 +2126,7 @@ static Array<Face *> exact_triangulate_poly(Face *f, IMeshArena *arena)
     bool needs_steiner = false;
     for (int i = 0; i < 3; ++i) {
       i_v_out[i] = cdt_out.face[t][i];
-      if (cdt_out.vert_orig[i_v_out[i]].size() == 0) {
+      if (cdt_out.vert_orig[i_v_out[i]].is_empty()) {
         needs_steiner = true;
         break;
       }
@@ -2763,7 +2763,7 @@ static CoplanarClusterInfo find_clusters(const IMesh &tm,
   if (dbg_level > 0) {
     std::cout << "found " << maybe_coplanar_tris.size() << " possible coplanar tris\n";
   }
-  if (maybe_coplanar_tris.size() == 0) {
+  if (maybe_coplanar_tris.is_empty()) {
     if (dbg_level > 0) {
       std::cout << "No possible coplanar tris, so no clusters\n";
     }
@@ -2810,7 +2810,7 @@ static CoplanarClusterInfo find_clusters(const IMesh &tm,
           no_int_cls.append(&cl);
         }
       }
-      if (int_cls.size() == 0) {
+      if (int_cls.is_empty()) {
         /* t doesn't intersect any existing cluster in its plane, so make one just for it. */
         if (dbg_level > 1) {
           std::cout << "no intersecting clusters for t, make a new one\n";
diff --git a/source/blender/blenlib/tests/BLI_delaunay_2d_test.cc b/source/blender/blenlib/tests/BLI_delaunay_2d_test.cc
index 5adfdc8f321..ba3a3f3614e 100644
--- a/source/blender/blenlib/tests/BLI_delaunay_2d_test.cc
+++ b/source/blender/blenlib/tests/BLI_delaunay_2d_test.cc
@@ -284,7 +284,7 @@ void graph_draw(const std::string &label,
   constexpr bool draw_vert_labels = false;
   constexpr bool draw_edge_labels = false;
 
-  if (verts.size() == 0) {
+  if (verts.is_empty()) {
     return;
   }
   vec2<double> vmin(1e10, 1e10);
diff --git a/source/blender/compositor/intern/COM_ConstantFolder.cc b/source/blender/compositor/intern/COM_ConstantFolder.cc
index cf9d39551f4..817fab1660b 100644
--- a/source/blender/compositor/intern/COM_ConstantFolder.cc
+++ b/source/blender/compositor/intern/COM_ConstantFolder.cc
@@ -119,7 +119,7 @@ Vector<MemoryBuffer *> ConstantFolder::get_constant_input_buffers(NodeOperation
 Vector<ConstantOperation *> ConstantFolder::try_fold_operations(Span<NodeOperation *> operations)
 {
   Set<NodeOperation *> foldable_ops = find_constant_foldable_operations(operations);
-  if (foldable_ops.size() == 0) {
+  if (foldable_ops.is_empty()) {
     return Vector<ConstantOperation *>();
   }
 
diff --git a/source/blender/compositor/intern/COM_NodeOperation.cc b/source/blender/compositor/intern/COM_NodeOperation.cc
index 2f10cd91236..42b07576b17 100644
--- a/source/blender/compositor/intern/COM_NodeOperation.cc
+++ b/source/blender/compositor/intern/COM_NodeOperation.cc
@@ -194,7 +194,7 @@ const rcti &NodeOperation::get_canvas() const
 
 void NodeOperation::unset_canvas()
 {
-  BLI_assert(inputs_.size() == 0);
+  BLI_assert(inputs_.is_empty());
   flags_.is_canvas_set = false;
 }
 
@@ -217,7 +217,7 @@ bool NodeOperation::determine_depending_area_of_interest(rcti *input,
                                                          ReadBufferOperation *read_operation,
                                                          rcti *output)
 {
-  if (inputs_.size() == 0) {
+  if (inputs_.is_empty()) {
     BLI_rcti_init(output, input->xmin, input->xmax, input->ymin, input->ymax);
     return false;
   }
diff --git a/source/blender/compositor/operations/COM_MaskOperation.cc b/source/blender/compositor/operations/COM_MaskOperation.cc
index 5d1b3436c31..bdf22952f5e 100644
--- a/source/blender/compositor/operations/COM_MaskOperation.cc
+++ b/source/blender/compositor/operations/COM_MaskOperation.cc
@@ -132,7 +132,7 @@ void MaskOperation::update_memory_buffer_partial(MemoryBuffer *output,
                                                  Span<MemoryBuffer *> /*inputs*/)
 {
   Vector<MaskRasterHandle *> handles = get_non_null_handles();
-  if (handles.size() == 0) {
+  if (handles.is_empty()) {
     output->fill(area, COM_VALUE_ZERO);
     return;
   }
diff --git a/source/blender/compositor/realtime_compositor/cached_resources/intern/keying_screen.cc b/source/blender/compositor/realtime_compositor/cached_resources/intern/keying_screen.cc
index 206346c7382..3efe8a6e907 100644
--- a/source/blender/compositor/realtime_compositor/cached_resources/intern/keying_screen.cc
+++ b/source/blender/compositor/realtime_compositor/cached_resources/intern/keying_screen.cc
@@ -64,8 +64,8 @@ static void compute_marker_points(MovieClip *movie_clip,
                                   Vector<float2> &marker_positions,
                                   Vector<float4> &marker_colors)
 {
-  BLI_assert(marker_positions.size() == 0);
-  BLI_assert(marker_colors.size() == 0);
+  BLI_assert(marker_positions.is_empty());
+  BLI_assert(marker_colors.is_empty());
 
   ImBuf *image_buffer = BKE_movieclip_get_ibuf(movie_clip, &movie_clip_user);
   if (!image_buffer) {
diff --git a/source/blender/draw/engines/overlay/overlay_next_private.hh b/source/blender/draw/engines/overlay/overlay_next_private.hh
index 0563390f531..07e522dd613 100644
--- a/source/blender/draw/engines/overlay/overlay_next_private.hh
+++ b/source/blender/draw/engines/overlay/overlay_next_private.hh
@@ -256,7 +256,7 @@ template<typename InstanceDataT> struct ShapeInstanceBuf : private select::Selec
 
   void end_sync(PassSimple &pass, GPUBatch *shape)
   {
-    if (data_buf.size() == 0) {
+    if (data_buf.is_empty()) {
       return;
     }
     this->select_bind(pass);
diff --git a/source/blender/editors/grease_pencil/intern/grease_pencil_edit.cc b/source/blender/editors/grease_pencil/intern/grease_pencil_edit.cc
index 773defb61e6..eb2ba2f3f4c 100644
--- a/source/blender/editors/grease_pencil/intern/grease_pencil_edit.cc
+++ b/source/blender/editors/grease_pencil/intern/grease_pencil_edit.cc
@@ -616,7 +616,7 @@ static bke::CurvesGeometry remove_points_and_split(const bke::CurvesGeometry &cu
     const Vector<IndexRange> ranges_to_keep = array_utils::find_all_ranges(curve_points_to_delete,
                                                                            false);
 
-    if (ranges_to_keep.size() == 0) {
+    if (ranges_to_keep.is_empty()) {
       continue;
     }
 
@@ -1555,7 +1555,7 @@ static void duplicate_points(bke::CurvesGeometry &curves, const IndexMask &mask)
     const Vector<IndexRange> ranges_to_duplicate = array_utils::find_all_ranges(
         curve_points_to_duplicate, true);
 
-    if (ranges_to_duplicate.size() == 0) {
+    if (ranges_to_duplicate.is_empty()) {
       continue;
     }
 
diff --git a/source/blender/editors/sculpt_paint/sculpt_geodesic.cc b/source/blender/editors/sculpt_paint/sculpt_geodesic.cc
index 39b578f8da6..14e6b11073b 100644
--- a/source/blender/editors/sculpt_paint/sculpt_geodesic.cc
+++ b/source/blender/editors/sculpt_paint/sculpt_geodesic.cc
@@ -199,7 +199,7 @@ static float *geodesic_mesh_create(Object *ob, GSet *initial_verts, const float
                 }
 
                 if (e_other != e && !BLI_BITMAP_TEST(edge_tag, e_other) &&
-                    (ss->epmap[e_other].size() == 0 || dists[ev_other] != FLT_MAX))
+                    (ss->epmap[e_other].is_empty() || dists[ev_other] != FLT_MAX))
                 {
                   if (BLI_BITMAP_TEST(affected_vertex, v_other) ||
                       BLI_BITMAP_TEST(affected_vertex, ev_other)) {
diff --git a/source/blender/editors/space_node/node_draw.cc b/source/blender/editors/space_node/node_draw.cc
index 5d5beb28d29..0080f7b73a2 100644
--- a/source/blender/editors/space_node/node_draw.cc
+++ b/source/blender/editors/space_node/node_draw.cc
@@ -2769,7 +2769,7 @@ static void node_draw_extra_info_panel(const bContext &C,
     preview = nullptr;
   }
   Vector<NodeExtraInfoRow> extra_info_rows = node_get_extra_info(C, tree_draw_ctx, snode, node);
-  if (extra_info_rows.size() == 0 && !preview) {
+  if (extra_info_rows.is_empty() && !preview) {
     return;
   }
 
diff --git a/source/blender/editors/space_node/node_shader_preview.cc b/source/blender/editors/space_node/node_shader_preview.cc
index 25c1a5b5dd9..529ee1e5914 100644
--- a/source/blender/editors/space_node/node_shader_preview.cc
+++ b/source/blender/editors/space_node/node_shader_preview.cc
@@ -452,7 +452,7 @@ static void connect_node_to_surface_output(const Span<bNodeTreePath *> treepath,
 static void connect_nodes_to_aovs(const Span<bNodeTreePath *> treepath,
                                   const Span<NodeSocketPair> &nodesocket_span)
 {
-  if (nodesocket_span.size() == 0) {
+  if (nodesocket_span.is_empty()) {
     return;
   }
   bNodeTree *main_nt = treepath.first()->nodetree;
diff --git a/source/blender/editors/space_sequencer/sequencer_retiming.cc b/source/blender/editors/space_sequencer/sequencer_retiming.cc
index aed12d3d8f4..bab52d55d41 100644
--- a/source/blender/editors/space_sequencer/sequencer_retiming.cc
+++ b/source/blender/editors/space_sequencer/sequencer_retiming.cc
@@ -242,7 +242,7 @@ static int retiming_key_add_to_editable_strips(bContext *C,
   bool inserted = false;
 
   blender::Map selection = SEQ_retiming_selection_get(ed);
-  if (selection.size() == 0) {
+  if (selection.is_empty()) {
     return OPERATOR_CANCELLED;
   }
 
diff --git a/source/blender/editors/transform/transform_convert_sequencer_retiming.cc b/source/blender/editors/transform/transform_convert_sequencer_retiming.cc
index 6d6131ad767..93eb527b2bf 100644
--- a/source/blender/editors/transform/transform_convert_sequencer_retiming.cc
+++ b/source/blender/editors/transform/transform_convert_sequencer_retiming.cc
@@ -87,7 +87,7 @@ static void createTransSeqRetimingData(bContext * /*C*/, TransInfo *t)
 
   const blender::Map selection = SEQ_retiming_selection_get(SEQ_editing_get(t->scene));
 
-  if (selection.size() == 0) {
+  if (selection.is_empty()) {
     return;
   }
 
diff --git a/source/blender/editors/uvedit/uvedit_unwrap_ops.cc b/source/blender/editors/uvedit/uvedit_unwrap_ops.cc
index bd31462e285..727c4e39a7f 100644
--- a/source/blender/editors/uvedit/uvedit_unwrap_ops.cc
+++ b/source/blender/editors/uvedit/uvedit_unwrap_ops.cc
@@ -1223,7 +1223,7 @@ static void uvedit_pack_islands_multi(const Scene *scene,
     }
   }
 
-  if (island_vector.size() == 0) {
+  if (island_vector.is_empty()) {
     return;
   }
 
@@ -2882,7 +2882,7 @@ static int smart_project_exec(bContext *C, wmOperator *op)
                                                    project_angle_limit_cos,
                                                    area_weight);
 
-    if (project_normal_array.size() == 0) {
+    if (project_normal_array.is_empty()) {
       MEM_freeN(thick_faces);
       continue;
     }
diff --git a/source/blender/geometry/intern/mesh_merge_by_distance.cc b/source/blender/geometry/intern/mesh_merge_by_distance.cc
index 0e5d2d7d2d9..56173aa6adf 100644
--- a/source/blender/geometry/intern/mesh_merge_by_distance.cc
+++ b/source/blender/geometry/intern/mesh_merge_by_distance.cc
@@ -384,7 +384,7 @@ static void weld_edge_find_doubles(Span<WeldEdge> weld_edges,
   /* Setup Edge Overlap. */
   int edge_double_kill_len = 0;
 
-  if (weld_edges.size() == 0) {
+  if (weld_edges.is_empty()) {
     *r_edge_double_kill_len = edge_double_kill_len;
     return;
   }
@@ -1041,7 +1041,7 @@ static int poly_find_doubles(const OffsetIndices<int> poly_corners_offsets,
 
   /* Use a reverse for loop to ensure that indexes are assigned in ascending order. */
   for (int face_index = poly_num; face_index--;) {
-    if (poly_corners_offsets[face_index].size() == 0) {
+    if (poly_corners_offsets[face_index].is_empty()) {
       continue;
     }
 
diff --git a/source/blender/geometry/intern/uv_pack.cc b/source/blender/geometry/intern/uv_pack.cc
index 3f9260600da..e47b1888937 100644
--- a/source/blender/geometry/intern/uv_pack.cc
+++ b/source/blender/geometry/intern/uv_pack.cc
@@ -1493,7 +1493,7 @@ static bool rotate_inside_square(const Span<std::unique_ptr<UVAABBIsland>> islan
                                  MutableSpan<UVPhi> r_phis,
                                  rctf *r_extent)
 {
-  if (island_indices.size() == 0) {
+  if (island_indices.is_empty()) {
     return false; /* Nothing to do. */
   }
   if (params.rotate_method != ED_UVPACK_ROTATION_ANY) {
@@ -2250,7 +2250,7 @@ float pack_islands(const Span<PackIsland *> &islands, const UVPackIsland_Params
   BLI_assert(0.0f <= params.margin);
   BLI_assert(0.0f <= params.target_aspect_y);
 
-  if (islands.size() == 0) {
+  if (islands.is_empty()) {
     return 1.0f; /* Nothing to do, just create a safe default. */
   }
 
diff --git a/source/blender/gpu/intern/gpu_debug.cc b/source/blender/gpu/intern/gpu_debug.cc
index e33dbc975fc..af565358bae 100644
--- a/source/blender/gpu/intern/gpu_debug.cc
+++ b/source/blender/gpu/intern/gpu_debug.cc
@@ -47,7 +47,7 @@ void GPU_debug_get_groups_names(int name_buf_len, char *r_name_buf)
     return;
   }
   DebugStack &stack = ctx->debug_stack;
-  if (stack.size() == 0) {
+  if (stack.is_empty()) {
     r_name_buf[0] = '\0';
     return;
   }
diff --git a/source/blender/gpu/intern/gpu_shader.cc b/source/blender/gpu/intern/gpu_shader.cc
index 91f5c4e046f..a62286cb8b7 100644
--- a/source/blender/gpu/intern/gpu_shader.cc
+++ b/source/blender/gpu/intern/gpu_shader.cc
@@ -64,7 +64,7 @@ Shader::~Shader()
 
 static void standard_defines(Vector<const char *> &sources)
 {
-  BLI_assert(sources.size() == 0);
+  BLI_assert(sources.is_empty());
   /* Version needs to be first. Exact values will be added by implementation. */
   sources.append("version");
   /* Define to identify code usage in shading language. */
diff --git a/source/blender/gpu/intern/gpu_shader_dependency.cc b/source/blender/gpu/intern/gpu_shader_dependency.cc
index d69b4a2c47e..d5e9e945514 100644
--- a/source/blender/gpu/intern/gpu_shader_dependency.cc
+++ b/source/blender/gpu/intern/gpu_shader_dependency.cc
@@ -575,7 +575,7 @@ struct GPUSource {
       CHECK(char_end, input, cursor, "Malformed char literal. Missing ending `'`.");
 
       StringRef input_char = input.substr(char_start, char_end - char_start);
-      if (input_char.size() == 0) {
+      if (input_char.is_empty()) {
         CHECK(-1, input, cursor, "Malformed char literal. Empty character constant");
       }
 
diff --git a/source/blender/gpu/intern/gpu_shader_interface.cc b/source/blender/gpu/intern/gpu_shader_interface.cc
index e450f4f8ca6..bc135866a71 100644
--- a/source/blender/gpu/intern/gpu_shader_interface.cc
+++ b/source/blender/gpu/intern/gpu_shader_interface.cc
@@ -29,7 +29,7 @@ ShaderInterface::~ShaderInterface()
 
 static void sort_input_list(MutableSpan<ShaderInput> dst)
 {
-  if (dst.size() == 0) {
+  if (dst.is_empty()) {
     return;
   }
 
diff --git a/source/blender/gpu/intern/gpu_shader_log.cc b/source/blender/gpu/intern/gpu_shader_log.cc
index 0997c89b788..d97a1fb6dfb 100644
--- a/source/blender/gpu/intern/gpu_shader_log.cc
+++ b/source/blender/gpu/intern/gpu_shader_log.cc
@@ -77,7 +77,7 @@ void Shader::print_log(Span<const char *> sources,
     }
 #endif
   }
-  if (sources_end_line.size() == 0) {
+  if (sources_end_line.is_empty()) {
     sources_end_line.append(0);
   }
 
diff --git a/source/blender/ikplugin/intern/iksolver_plugin.cc b/source/blender/ikplugin/intern/iksolver_plugin.cc
index 8ea7183752e..3f612170c44 100644
--- a/source/blender/ikplugin/intern/iksolver_plugin.cc
+++ b/source/blender/ikplugin/intern/iksolver_plugin.cc
@@ -65,7 +65,7 @@ static void initialize_posetree(Object * /*ob*/, bPoseChannel *pchan_tip)
   blender::Vector<bConstraint *> ik_constraints;
   find_ik_constraints(&pchan_tip->constraints, ik_constraints);
 
-  if (ik_constraints.size() == 0) {
+  if (ik_constraints.is_empty()) {
     return;
   }
 
diff --git a/source/blender/io/wavefront_obj/exporter/obj_export_file_writer.cc b/source/blender/io/wavefront_obj/exporter/obj_export_file_writer.cc
index 38c21eb65fc..cd2e6d38c16 100644
--- a/source/blender/io/wavefront_obj/exporter/obj_export_file_writer.cc
+++ b/source/blender/io/wavefront_obj/exporter/obj_export_file_writer.cc
@@ -669,7 +669,7 @@ void MTLWriter::write_materials(const char *blen_filepath,
                                 const char *dest_dir,
                                 bool write_pbr)
 {
-  if (mtlmaterials_.size() == 0) {
+  if (mtlmaterials_.is_empty()) {
     return;
   }
 
diff --git a/source/blender/modifiers/intern/MOD_skin.cc b/source/blender/modifiers/intern/MOD_skin.cc
index 57a2af44902..ec8624d3838 100644
--- a/source/blender/modifiers/intern/MOD_skin.cc
+++ b/source/blender/modifiers/intern/MOD_skin.cc
@@ -539,7 +539,7 @@ static void end_node_frames(int v,
   const float *rad = nodes[v].radius;
   float mat[3][3];
 
-  if (emap[v].size() == 0) {
+  if (emap[v].is_empty()) {
     float avg = half_v2(rad);
 
     /* For solitary nodes, just build a box (two frames) */
@@ -814,7 +814,7 @@ static EMat *build_edge_mats(const MVertSkin *vs,
 
         *has_valid_root = true;
       }
-      else if (edges.size() == 0) {
+      else if (edges.is_empty()) {
         /* Vertex-only mesh is valid, mark valid root as well (will display error otherwise). */
         *has_valid_root = true;
         break;
diff --git a/source/blender/nodes/geometry/nodes/node_geo_dual_mesh.cc b/source/blender/nodes/geometry/nodes/node_geo_dual_mesh.cc
index 1dc84d6713a..f796f7a49e4 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_dual_mesh.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_dual_mesh.cc
@@ -332,7 +332,7 @@ static bool sort_vertex_faces(const Span<int2> edges,
                               MutableSpan<int> r_shared_edges,
                               MutableSpan<int> r_sorted_corners)
 {
-  if (connected_faces.size() <= 2 && (!boundary_vertex || connected_faces.size() == 0)) {
+  if (connected_faces.size() <= 2 && (!boundary_vertex || connected_faces.is_empty())) {
     return true;
   }
 
diff --git a/source/blender/nodes/geometry/nodes/node_geo_duplicate_elements.cc b/source/blender/nodes/geometry/nodes/node_geo_duplicate_elements.cc
index 90af0af0e58..5c4c3753046 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_duplicate_elements.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_duplicate_elements.cc
@@ -408,7 +408,7 @@ static void copy_stable_id_faces(const Mesh &mesh,
   int loop_index = 0;
   for (const int i_face : selection.index_range()) {
     const IndexRange range = face_offsets[i_face];
-    if (range.size() == 0) {
+    if (range.is_empty()) {
       continue;
     }
     const IndexRange source = faces[i_face];
@@ -950,7 +950,7 @@ static void duplicate_instances(GeometrySet &geometry_set,
   dst_instances->resize(duplicates.total_size());
   for (const int i_selection : selection.index_range()) {
     const IndexRange range = duplicates[i_selection];
-    if (range.size() == 0) {
+    if (range.is_empty()) {
       continue;
     }
     const int old_handle = src_instances.reference_handles()[i_selection];
diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
index 2d5196ef54e..1556237771a 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
@@ -33,7 +33,7 @@ static void node_geo_exec(GeoNodeExecParams params)
     evaluator.add(params.get_input<Field<bool>>("Selection"));
     evaluator.evaluate();
     const IndexMask selection = evaluator.get_evaluated_as_mask(0);
-    if (selection.size() == 0) {
+    if (selection.is_empty()) {
       geometry_set.remove_geometry_during_modify();
       return;
     }
diff --git a/source/blender/nodes/geometry/nodes/node_geo_string_to_curves.cc b/source/blender/nodes/geometry/nodes/node_geo_string_to_curves.cc
index 14e44c17978..86ad17fca82 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_string_to_curves.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_string_to_curves.cc
@@ -373,7 +373,7 @@ static void node_geo_exec(GeoNodeExecParams params)
     params.set_output("Remainder", std::move(layout->truncated_text));
   }
 
-  if (layout->positions.size() == 0) {
+  if (layout->positions.is_empty()) {
     params.set_output("Curve Instances", GeometrySet());
     params.set_default_remaining_outputs();
     return;