@@ -181,7 +181,7 @@ absl::optional<Number> NumberFromValue(const Value& value) {
181181 return Number::FromDouble (value.GetDouble ().NativeValue ());
182182 }
183183
184- return absl ::nullopt ;
184+ return std ::nullopt ;
185185}
186186
187187absl::StatusOr<absl::optional<Value>> CheckAlternativeNumericType (
@@ -192,7 +192,7 @@ absl::StatusOr<absl::optional<Value>> CheckAlternativeNumericType(
192192 absl::optional<Number> number = NumberFromValue (key);
193193
194194 if (!number.has_value ()) {
195- return absl ::nullopt ;
195+ return std ::nullopt ;
196196 }
197197
198198 if (!key.IsInt () && number->LosslessConvertibleToInt ()) {
@@ -215,7 +215,7 @@ absl::StatusOr<absl::optional<Value>> CheckAlternativeNumericType(
215215 }
216216 }
217217
218- return absl ::nullopt ;
218+ return std ::nullopt ;
219219}
220220
221221// Equality for maps. Template parameter provides either heterogeneous or
@@ -440,7 +440,7 @@ absl::StatusOr<absl::optional<bool>> HomogenousValueEqual(
440440 google::protobuf::MessageFactory* absl_nonnull message_factory,
441441 google::protobuf::Arena* absl_nonnull arena) {
442442 if (v1.kind () != v2.kind ()) {
443- return absl ::nullopt ;
443+ return std ::nullopt ;
444444 }
445445
446446 static_assert (std::is_lvalue_reference_v<decltype (v1.GetString ())>,
@@ -483,7 +483,7 @@ absl::StatusOr<absl::optional<bool>> HomogenousValueEqual(
483483 return OpaqueEqual (v1.GetOpaque (), v2.GetOpaque (), descriptor_pool,
484484 message_factory, arena);
485485 default :
486- return absl ::nullopt ;
486+ return std ::nullopt ;
487487 }
488488}
489489
@@ -582,7 +582,7 @@ absl::StatusOr<absl::optional<bool>> ValueEqualImpl(
582582 // map containing an Error. Return no matching overload to propagate an error
583583 // instead of a false result.
584584 if (v1.IsError () || v1.IsUnknown () || v2.IsError () || v2.IsUnknown ()) {
585- return absl ::nullopt ;
585+ return std ::nullopt ;
586586 }
587587
588588 return false ;
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