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Diffstat (limited to 'absl/flags/flag.cc')
-rw-r--r-- | absl/flags/flag.cc | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/absl/flags/flag.cc b/absl/flags/flag.cc new file mode 100644 index 00000000..0858259b --- /dev/null +++ b/absl/flags/flag.cc @@ -0,0 +1,46 @@ +// +// Copyright 2019 The Abseil Authors. +// +// 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 +// +// https://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. + +#include "absl/flags/flag.h" + +#include <cstring> + +namespace absl { +inline namespace lts_2019_08_08 { + +// We want to validate the type mismatch between type definition and +// declaration. The lock-free implementation does not allow us to do it, +// so in debug builds we always use the slower implementation, which always +// validates the type. +#ifndef NDEBUG +#define ABSL_FLAGS_ATOMIC_GET(T) \ + T GetFlag(const absl::Flag<T>& flag) { return flag.Get(); } +#else +#define ABSL_FLAGS_ATOMIC_GET(T) \ + T GetFlag(const absl::Flag<T>& flag) { \ + T result; \ + if (flag.AtomicGet(&result)) { \ + return result; \ + } \ + return flag.Get(); \ + } +#endif + +ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_ATOMIC_GET) + +#undef ABSL_FLAGS_ATOMIC_GET + +} // inline namespace lts_2019_08_08 +} // namespace absl |