imports: Switch to Microsoft GSL implementation

... with two minor code base changes compared to previous
use of gsl-lite:

- dag.hpp: ActionNode::Ptr and ArtifactNode::Ptr are not
  wrapped in gsl::not_null<> anymore, due to lack of support
  for wrapping std::unique_ptr<>. More specifically, the
  move constructor is missing, rendering it impossible to
  use std::vector<>::emplace_back().

- utils/cpp/gsl.hpp: New header file added to implement the
  macros ExpectsAudit() and EnsureAudit(), asserts running
  only in debug builds, which were available in gsl-lite but
  are missing in MS GSL.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/utils/cpp/gsl.hpp b/src/utils/cpp/gsl.hpp
new file mode 100644
index 00000000..882df29b
--- /dev/null
+++ b/src/utils/cpp/gsl.hpp
@@ -0,0 +1,33 @@
+// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef INCLUDED_SRC_UTILS_CPP_GSL_HPP
+#define INCLUDED_SRC_UTILS_CPP_GSL_HPP
+
+#include <gsl/gsl>
+
+// implement EnsuresAudit/ExpectsAudit (from gsl-lite) only run in debug mode
+#ifdef NDEBUG
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define ExpectsAudit(x) (void)0
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define EnsuresAudit(x) (void)0
+#else
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define ExpectsAudit(x) Expects(x)
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define EnsuresAudit(x) Ensures(x)
+#endif
+
+#endif  // INCLUDED_SRC_UTILS_CPP_GSL_HPP_