[clang] Use std::nullopt instead of None (NFC)

This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated.  The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.

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

1 files changed, 7 insertions, 7 deletions

diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
index b74cf5b..91dc252 100644
--- a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
+++ b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -60,7 +60,7 @@ void serializeArray(Object &Paren, StringRef Key, Optional<Array> Array) {
 /// the semantic version representation of \p V.
 Optional<Object> serializeSemanticVersion(const VersionTuple &V) {
   if (V.empty())
-    return None;
+    return std::nullopt;
 
   Object Version;
   Version["major"] = V.getMajor();
@@ -146,7 +146,7 @@ Object serializeSourceRange(const PresumedLoc &BeginLoc,
 /// an \c Array containing the formatted availability information.
 Optional<Array> serializeAvailability(const AvailabilitySet &Availabilities) {
   if (Availabilities.isDefault())
-    return None;
+    return std::nullopt;
 
   Array AvailabilityArray;
 
@@ -232,7 +232,7 @@ Object serializeIdentifier(const APIRecord &Record, Language Lang) {
 /// formatted lines.
 Optional<Object> serializeDocComment(const DocComment &Comment) {
   if (Comment.empty())
-    return None;
+    return std::nullopt;
 
   Object DocComment;
   Array LinesArray;
@@ -284,7 +284,7 @@ Optional<Object> serializeDocComment(const DocComment &Comment) {
 /// declaration fragments array.
 Optional<Array> serializeDeclarationFragments(const DeclarationFragments &DF) {
   if (DF.getFragments().empty())
-    return None;
+    return std::nullopt;
 
   Array Fragments;
   for (const auto &F : DF.getFragments()) {
@@ -412,7 +412,7 @@ Optional<Object> serializeFunctionSignatureMixinImpl(const RecordTy &Record,
                                                      std::true_type) {
   const auto &FS = Record.Signature;
   if (FS.empty())
-    return None;
+    return std::nullopt;
 
   Object Signature;
   serializeArray(Signature, "returns",
@@ -436,7 +436,7 @@ Optional<Object> serializeFunctionSignatureMixinImpl(const RecordTy &Record,
 template <typename RecordTy>
 Optional<Object> serializeFunctionSignatureMixinImpl(const RecordTy &Record,
                                                      std::false_type) {
-  return None;
+  return std::nullopt;
 }
 
 /// Serialize the function signature field, as specified by the
@@ -501,7 +501,7 @@ template <typename RecordTy>
 Optional<Object>
 SymbolGraphSerializer::serializeAPIRecord(const RecordTy &Record) const {
   if (shouldSkip(Record))
-    return None;
+    return std::nullopt;
 
   Object Obj;
   serializeObject(Obj, "identifier",