flag.cc
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1 //
2 // Copyright 2019 The Abseil Authors.
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // https://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 
16 #include "absl/flags/flag.h"
17 
18 #include <cstring>
19 
20 namespace absl {
21 
22 // We want to validate the type mismatch between type definition and
23 // declaration. The lock-free implementation does not allow us to do it,
24 // so in debug builds we always use the slower implementation, which always
25 // validates the type.
26 #ifndef NDEBUG
27 #define ABSL_FLAGS_ATOMIC_GET(T) \
28  T GetFlag(const absl::Flag<T>& flag) { \
29  T result; \
30  flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
31  return result; \
32  }
33 #else
34 #define ABSL_FLAGS_ATOMIC_GET(T) \
35  T GetFlag(const absl::Flag<T>& flag) { \
36  const int64_t r = flag.internal.atomic.load(std::memory_order_acquire); \
37  if (r != flags_internal::CommandLineFlag::kAtomicInit) { \
38  T t; \
39  memcpy(&t, &r, sizeof(T)); \
40  return t; \
41  } \
42  T result; \
43  flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
44  return result; \
45  }
46 #endif
47 
49 
50 #undef ABSL_FLAGS_ATOMIC_GET
51 
52 } // namespace absl
#define ABSL_FLAGS_ATOMIC_GET(T)
Definition: flag.cc:27
#define ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(A)
Definition: algorithm.h:29


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autogenerated on Wed Jun 19 2019 19:19:56