[iter] Use hb_apply() with lambda functions in a few places

src/hb-ot-layout-gsub-table.hh

@@ -345,18 +345,20 @@ struct MultipleSubstFormat1
 
   void closure (hb_closure_context_t *c) const
   {
-    for (auto it = hb_zip (this+coverage, sequence)
-		 | hb_filter (*c->glyphs, hb_first)
-		 | hb_map (hb_second); it; ++it)
-      (this+*it).closure (c);
+    + hb_zip (this+coverage, sequence)
+    | hb_filter (*c->glyphs, hb_first)
+    | hb_map (hb_second)
+    | hb_apply ([&](const OffsetTo<Sequence> &_) { (this+_).closure (c); })
+    ;
   }
 
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     if (unlikely (!(this+coverage).add_coverage (c->input))) return;
-    for (auto it = hb_zip (this+coverage, sequence)
-		 | hb_map (hb_second); it; ++it)
-      (this+*it).collect_glyphs (c);
+    + hb_zip (this+coverage, sequence)
+    | hb_map (hb_second)
+    | hb_apply ([&](const OffsetTo<Sequence> &_) { (this+_).collect_glyphs (c); })
+    ;
   }
 
   const Coverage &get_coverage () const { return this+coverage; }
@@ -521,17 +523,19 @@ struct AlternateSubstFormat1
 
   void closure (hb_closure_context_t *c) const
   {
-    for (auto it = hb_zip (this+coverage, alternateSet)
-		 | hb_map (hb_second); it; ++it)
-      (this+*it).closure (c);
+    + hb_zip (this+coverage, alternateSet)
+    | hb_map (hb_second)
+    | hb_apply ([&](const OffsetTo<AlternateSet> &_) { (this+_).closure (c); })
+    ;
   }
 
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     if (unlikely (!(this+coverage).add_coverage (c->input))) return;
-    for (auto it = hb_zip (this+coverage, alternateSet)
-		 | hb_map (hb_second); it; ++it)
-      (this+*it).collect_glyphs (c);
+    + hb_zip (this+coverage, alternateSet)
+    | hb_map (hb_second)
+    | hb_apply ([&](const OffsetTo<AlternateSet> &_) { (this+_).collect_glyphs (c); })
+    ;
   }
 
   const Coverage &get_coverage () const { return this+coverage; }