[llvm] [llvm][ADT] Add wrappers to `std::fill` (PR #146681)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Longsheng Mou (CoTinker)

<details>
<summary>Changes</summary>

This PR adds  `llvm::fill` that accepts a range instead of start/end iterator.

---
Full diff: https://github.com/llvm/llvm-project/pull/146681.diff


2 Files Affected:

- (modified) llvm/include/llvm/ADT/STLExtras.h (+6) 
- (modified) llvm/unittests/ADT/STLExtrasTest.cpp (+12) 


``````````diff
diff --git a/llvm/include/llvm/ADT/STLExtras.h b/llvm/include/llvm/ADT/STLExtras.h
index eea06cfb99ba2..b23188cbdadeb 100644
--- a/llvm/include/llvm/ADT/STLExtras.h
+++ b/llvm/include/llvm/ADT/STLExtras.h
@@ -1759,6 +1759,12 @@ bool none_of(R &&Range, UnaryPredicate P) {
   return std::none_of(adl_begin(Range), adl_end(Range), P);
 }
 
+/// Provide wrappers to std::fill which take ranges instead of having to pass
+/// begin/end explicitly.
+template <typename R, typename T> void fill(R &&Range, T &&Value) {
+  std::fill(adl_begin(Range), adl_end(Range), std::forward<T>(Value));
+}
+
 /// Provide wrappers to std::find which take ranges instead of having to pass
 /// begin/end explicitly.
 template <typename R, typename T> auto find(R &&Range, const T &Val) {
diff --git a/llvm/unittests/ADT/STLExtrasTest.cpp b/llvm/unittests/ADT/STLExtrasTest.cpp
index 286cfa745fd14..14f5da1ff9549 100644
--- a/llvm/unittests/ADT/STLExtrasTest.cpp
+++ b/llvm/unittests/ADT/STLExtrasTest.cpp
@@ -1591,6 +1591,18 @@ TEST(STLExtrasTest, Includes) {
   }
 }
 
+TEST(STLExtrasTest, Fill) {
+  std::vector<int> V1 = {1, 2, 3};
+  std::vector<int> V2;
+  int Val = 4;
+  auto SameToVal = [&](int V) { return V == Val; };
+  fill(V1, Val);
+  EXPECT_TRUE(llvm::all_of(V1, SameToVal));
+  V2.resize(5);
+  fill(V2, Val);
+  EXPECT_TRUE(llvm::all_of(V2, SameToVal));
+}
+
 struct Foo;
 struct Bar {};
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/146681