[PATCH] D75208: [MLIR] Add `take_back()` to STLExtras.h for completeness.

[Alexander Belyaev via Phabricator via llvm-commits]

pifon2a created this revision.
Herald added subscribers: llvm-commits, Joonsoo, liufengdb, lucyrfox, mgester, arpith-jacob, nicolasvasilache, antiagainst, shauheen, burmako, jpienaar, rriddle, mehdi_amini.
Herald added a project: LLVM.
pifon2a added a reviewer: rriddle.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75208

Files:
  mlir/include/mlir/Support/STLExtras.h


Index: mlir/include/mlir/Support/STLExtras.h
===================================================================
--- mlir/include/mlir/Support/STLExtras.h
+++ mlir/include/mlir/Support/STLExtras.h
@@ -268,6 +268,12 @@
                       : static_cast<const DerivedT &>(*this);
   }
 
+  /// Take the last n elements.
+  DerivedT take_back(size_t n = 1) const {
+    return n < size() ? drop_front(size() - n)
+                      : static_cast<const DerivedT &>(*this);
+  }
+
   /// Allow conversion to SmallVector if necessary.
   /// TODO(riverriddle) Remove this when SmallVector accepts different range
   /// types in its constructor.


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