From d7e503869521b47cf517ba7c2b50714f5299537f Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Sat, 10 Dec 2022 10:22:11 -0800
Subject: [PATCH] [Presburger] Use std::optional in PresburgerRelation.cpp
 (NFC)

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
---
 mlir/lib/Analysis/Presburger/PresburgerRelation.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mlir/lib/Analysis/Presburger/PresburgerRelation.cpp b/mlir/lib/Analysis/Presburger/PresburgerRelation.cpp
index 09710bd..37fdf38 100644
--- a/mlir/lib/Analysis/Presburger/PresburgerRelation.cpp
+++ b/mlir/lib/Analysis/Presburger/PresburgerRelation.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallBitVector.h"
+#include <optional>
 
 using namespace mlir;
 using namespace presburger;
@@ -212,7 +213,7 @@ static PresburgerRelation getSetDifference(IntegerRelation b,
     SmallVector<unsigned, 8> ineqsToProcess;
     // The index of the last inequality that was processed at this level.
     // This is empty when we are coming to this level for the first time.
-    Optional<unsigned> lastIneqProcessed;
+    std::optional<unsigned> lastIneqProcessed;
   };
   SmallVector<Frame, 2> frames;
 
-- 
2.7.4