diff options
| author |  Evan Brown <ezb@google.com> | 2022-09-20 13:12:25 -0700 |
|---|---|---|
| committer |  Copybara-Service <copybara-worker@google.com> | 2022-09-20 13:13:13 -0700 |
| commit | d859fafe1ab9edc9c04ca262d9993be82c757881 (patch) | |
| tree | 6794fb010d0f423ea6a8fb65176efb9231ad095d /absl/base/optimization.h | |
| parent | 800c04f64afa48271c6eaee67da489a7ebf92757 (diff) | |
Change the macro ABSL_IS_TRIVIALLY_RELOCATABLE into a type trait - absl::is_trivially_relocatable - and move it from optimization.h to type_traits.h.
Example of how to change to the new type trait:
```
#include "absl/base/attributes.h"
if (ABSL_IS_TRIVIALLY_RELOCATABLE(T)) { DoSomething(); }
```
to
```
#include "absl/meta/type_traits.h"
if (absl::is_trivially_relocatable<T>::value) { DoSomething(); }
```
Note that optimization.h is also built in C mode so we can't put a type trait there.
PiperOrigin-RevId: 475633715
Change-Id: I2bc85f3f6711d1280049fd01eb97c497d2d0d929
Diffstat (limited to 'absl/base/optimization.h')
| -rw-r--r-- | absl/base/optimization.h | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/absl/base/optimization.h b/absl/base/optimization.h index 57999a18..db5cc097 100644 --- a/absl/base/optimization.h +++ b/absl/base/optimization.h @@ -249,28 +249,4 @@ #define ABSL_INTERNAL_UNIQUE_SMALL_NAME() #endif -// ABSL_IS_TRIVIALLY_RELOCATABLE(type) -// Detects whether a type is "trivially relocatable" -- meaning it can be -// relocated without invoking the constructor/destructor, using a form of move -// elision. -// -// Example: -// -// if constexpr (ABSL_IS_TRIVIALLY_RELOCATABLE(T)) { -// memcpy(new_location, old_location, sizeof(T)); -// } else { -// new(new_location) T(std::move(*old_location)); -// old_location->~T(); -// } -// -// Upstream documentation: -// -// https://clang.llvm.org/docs/LanguageExtensions.html#:~:text=__is_trivially_relocatable -// -#if ABSL_HAVE_BUILTIN(__is_trivially_relocatable) -#define ABSL_IS_TRIVIALLY_RELOCATABLE(type) __is_trivially_relocatable(type) -#else -#define ABSL_IS_TRIVIALLY_RELOCATABLE(type) false -#endif - #endif // ABSL_BASE_OPTIMIZATION_H_ |