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Diffstat (limited to 'absl/base/attributes.h')
| -rw-r--r-- | absl/base/attributes.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/absl/base/attributes.h b/absl/base/attributes.h index 325e2f8d..294e5d0c 100644 --- a/absl/base/attributes.h +++ b/absl/base/attributes.h @@ -706,4 +706,26 @@ #define ABSL_ATTRIBUTE_PURE_FUNCTION #endif +// ABSL_ATTRIBUTE_LIFETIME_BOUND indicates that a resource owned by a function +// parameter or implicit object parameter is retained by the return value of the +// annotated function (or, for a parameter of a constructor, in the value of the +// constructed object). This attribute causes warnings to be produced if a +// temporary object does not live long enough. +// +// When applied to a reference parameter, the referenced object is assumed to be +// retained by the return value of the function. When applied to a non-reference +// parameter (for example, a pointer or a class type), all temporaries +// referenced by the parameter are assumed to be retained by the return value of +// the function. +// +// See also the upstream documentation: +// https://clang.llvm.org/docs/AttributeReference.html#lifetimebound +#if ABSL_HAVE_CPP_ATTRIBUTE(clang::lifetimebound) +#define ABSL_ATTRIBUTE_LIFETIME_BOUND [[clang::lifetimebound]] +#elif ABSL_HAVE_ATTRIBUTE(lifetimebound) +#define ABSL_ATTRIBUTE_LIFETIME_BOUND __attribute__((lifetimebound)) +#else +#define ABSL_ATTRIBUTE_LIFETIME_BOUND +#endif + #endif // ABSL_BASE_ATTRIBUTES_H_ |