[ADT] Add const to AllocatorList::{empty,size}

[kazutakahirata]

While I am at it, this patch adds [[nodiscard]].

[llvmbot]

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

Changes

While I am at it, this patch adds [[nodiscard]].

---

Full diff: https://github.com/llvm/llvm-project/pull/161320.diff

1 Files Affected:

• (modified) llvm/include/llvm/ADT/AllocatorList.h (+2-2)

diff --git a/llvm/include/llvm/ADT/AllocatorList.h b/llvm/include/llvm/ADT/AllocatorList.h
index 04d0afc9d076e..2716b83ca224a 100644
--- a/llvm/include/llvm/ADT/AllocatorList.h
+++ b/llvm/include/llvm/ADT/AllocatorList.h
@@ -155,8 +155,8 @@ template <class T, class AllocatorT> class AllocatorList : AllocatorT {
     std::swap(getAlloc(), RHS.getAlloc());
   }
 
-  bool empty() { return List.empty(); }
-  size_t size() { return List.size(); }
+  [[nodiscard]] bool empty() const { return List.empty(); }
+  [[nodiscard]] size_t size() const { return List.size(); }
 
   iterator begin() { return iterator(List.begin()); }
   iterator end() { return iterator(List.end()); }