[llvm] bbf01f9 - [ADT] Take graph as const & in some post-order iterators (NFC).

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2021-04-17T17:05:24+01:00
New Revision: bbf01f96b5ccc1dcb4d1d47cb55292c27c698dbb

URL: https://github.com/llvm/llvm-project/commit/bbf01f96b5ccc1dcb4d1d47cb55292c27c698dbb
DIFF: https://github.com/llvm/llvm-project/commit/bbf01f96b5ccc1dcb4d1d47cb55292c27c698dbb.diff

LOG: [ADT] Take graph as const & in some post-order iterators (NFC).

This patch updates a couple of functions that unnecessarily took the
input graph by value, when it was not needed. They can take the graph by
const-reference instead, which does not require GraphT to provide a copy
constructor.

Split off from D100169.

Added: 
    

Modified: 
    llvm/include/llvm/ADT/PostOrderIterator.h

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/ADT/PostOrderIterator.h b/llvm/include/llvm/ADT/PostOrderIterator.h
index 9586a8f3c8ee..3ab76d7cf740 100644
--- a/llvm/include/llvm/ADT/PostOrderIterator.h
+++ b/llvm/include/llvm/ADT/PostOrderIterator.h
@@ -140,15 +140,15 @@ class po_iterator : public po_iterator_storage<SetType, ExtStorage> {
 
 public:
   // Provide static "constructors"...
-  static po_iterator begin(GraphT G) {
+  static po_iterator begin(const GraphT &G) {
     return po_iterator(GT::getEntryNode(G));
   }
-  static po_iterator end(GraphT G) { return po_iterator(); }
+  static po_iterator end(const GraphT &G) { return po_iterator(); }
 
-  static po_iterator begin(GraphT G, SetType &S) {
+  static po_iterator begin(const GraphT &G, SetType &S) {
     return po_iterator(GT::getEntryNode(G), S);
   }
-  static po_iterator end(GraphT G, SetType &S) { return po_iterator(S); }
+  static po_iterator end(const GraphT &G, SetType &S) { return po_iterator(S); }
 
   bool operator==(const po_iterator &x) const {
     return VisitStack == x.VisitStack;