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| author |  Chris Kennelly <ckennelly@google.com> | 2023-03-13 10:10:12 -0700 |
|---|---|---|
| committer |  Copybara-Service <copybara-worker@google.com> | 2023-03-13 10:11:05 -0700 |
| commit | 34e29aae4fe9d296d57268809dfb78a34e705233 (patch) | |
| tree | df88231b1abea40cd00e03a8ce2e1661afcccd22 | |
| parent | d8933b836b1e1aac982b1dd42cc6ac1343a878d5 (diff) | |
Add ABSL_ATTRIBUTE_NO_UNIQUE_ADDRESS helper.
PiperOrigin-RevId: 516245113
Change-Id: Idaef538c9392decbfdeb3ed3b3c109c795f92f4d
| -rw-r--r-- | absl/base/attributes.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/absl/base/attributes.h b/absl/base/attributes.h index b7826e77..91bf954b 100644 --- a/absl/base/attributes.h +++ b/absl/base/attributes.h @@ -779,4 +779,18 @@ #define ABSL_ATTRIBUTE_TRIVIAL_ABI #endif +// ABSL_ATTRIBUTE_NO_UNIQUE_ADDRESS +// +// Indicates a data member can be optimized to occupy no space (if it is empty) +// and/or its tail padding can be used for other members. +// +// For code that is assured to only build with C++20 or later, prefer using +// the standard attribute `[[no_unique_address]]` directly instead of this +// macro. +#if ABSL_HAVE_CPP_ATTRIBUTE(no_unique_address) +#define ABSL_ATTRIBUTE_NO_UNIQUE_ADDRESS [[no_unique_address]] +#else +#define ABSL_ATTRIBUTE_NO_UNIQUE_ADDRESS +#endif + #endif // ABSL_BASE_ATTRIBUTES_H_ |