util: remove ndn::optional, use std::optional directly
Change-Id: I503e8f250e80e0ff7708070effc2e84e3b38b3b7
diff --git a/tests/unit/security/certificate.t.cpp b/tests/unit/security/certificate.t.cpp
index f113ca9..37243d6 100644
--- a/tests/unit/security/certificate.t.cpp
+++ b/tests/unit/security/certificate.t.cpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
- * Copyright (c) 2013-2022 Regents of the University of California.
+ * Copyright (c) 2013-2023 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
@@ -366,7 +366,7 @@
sigInfo.removeCustomTlv(tlv::AdditionalDescription);
sigInfo.addCustomTlv(makeStringBlock(tlv::ValidityPeriod, "malformed"));
sigInfo.setSignatureType(tlv::DigestSha256);
- sigInfo.setKeyLocator(nullopt);
+ sigInfo.setKeyLocator(std::nullopt);
Certificate cert6(cert3);
cert6.setSignatureInfo(sigInfo);
BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(cert6), expected6);