build: switch to C++17
Change-Id: Ie68020a04b7e20b74778b6d0370544ded55c5e26
diff --git a/tools/nfdc/canonizer.cpp b/tools/nfdc/canonizer.cpp
index 3e526cd..a44a2bf 100644
--- a/tools/nfdc/canonizer.cpp
+++ b/tools/nfdc/canonizer.cpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
- * Copyright (c) 2014-2020, Regents of the University of California,
+ * Copyright (c) 2014-2022, Regents of the University of California,
* Arizona Board of Regents,
* Colorado State University,
* University Pierre & Marie Curie, Sorbonne University,
@@ -29,10 +29,10 @@
namespace tools {
namespace nfdc {
-std::pair<optional<FaceUri>, std::string>
+std::pair<std::optional<FaceUri>, std::string>
canonize(ExecuteContext& ctx, const FaceUri& uri)
{
- optional<FaceUri> result;
+ std::optional<FaceUri> result;
std::string error;
uri.canonize(
[&result] (const FaceUri& canonicalUri) { result = canonicalUri; },