[PATCH] D114807: [llvm][stlextras] Add const methods to concat_range and enumerator

[Jeff Niu via Phabricator via llvm-commits]

Mogball created this revision.
Mogball added a reviewer: jpienaar.
Herald added a subscriber: dexonsmith.
Mogball requested review of this revision.
Herald added a project: LLVM.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D114807

Files:
  llvm/include/llvm/ADT/STLExtras.h


Index: llvm/include/llvm/ADT/STLExtras.h
===================================================================
--- llvm/include/llvm/ADT/STLExtras.h
+++ llvm/include/llvm/ADT/STLExtras.h
@@ -1019,17 +1019,31 @@
   template <size_t... Ns> iterator begin_impl(std::index_sequence<Ns...>) {
     return iterator(std::get<Ns>(Ranges)...);
   }
+  template <size_t... Ns>
+  iterator begin_impl(std::index_sequence<Ns...>) const {
+    return iterator(std::get<Ns>(Ranges)...);
+  }
   template <size_t... Ns> iterator end_impl(std::index_sequence<Ns...>) {
     return iterator(make_range(std::end(std::get<Ns>(Ranges)),
                                std::end(std::get<Ns>(Ranges)))...);
   }
+  template <size_t... Ns> iterator end_impl(std::index_sequence<Ns...>) const {
+    return iterator(make_range(std::end(std::get<Ns>(Ranges)),
+                               std::end(std::get<Ns>(Ranges)))...);
+  }
 
 public:
   concat_range(RangeTs &&... Ranges)
       : Ranges(std::forward<RangeTs>(Ranges)...) {}
 
   iterator begin() { return begin_impl(std::index_sequence_for<RangeTs...>{}); }
+  iterator begin() const {
+    return begin_impl(std::index_sequence_for<RangeTs...>{});
+  }
   iterator end() { return end_impl(std::index_sequence_for<RangeTs...>{}); }
+  iterator end() const {
+    return end_impl(std::index_sequence_for<RangeTs...>{});
+  }
 };
 
 } // end namespace detail
@@ -1977,10 +1991,16 @@
   enumerator_iter<R> begin() {
     return enumerator_iter<R>(0, std::begin(TheRange));
   }
+  enumerator_iter<R> begin() const {
+    return enumerator_iter<R>(0, std::begin(TheRange));
+  }
 
   enumerator_iter<R> end() {
     return enumerator_iter<R>(std::end(TheRange));
   }
+  enumerator_iter<R> end() const {
+    return enumerator_iter<R>(std::end(TheRange));
+  }
 
 private:
   R TheRange;


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