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| author | Abseil Team <absl-team@google.com> | 2023-03-24 17:03:36 -0700 |
|---|---|---|
| committer | Copybara-Service <copybara-worker@google.com> | 2023-03-24 17:04:24 -0700 |
| commit | c9f49460fa38cc24c3f476eb2998abca105cf63d (patch) | |
| tree | 40ba92f6b5fafd804efaa16e1b6c8811639d8528 /absl/meta | |
| parent | c92b6ce052ec4507e6f7ae44b435ab57e3e0fba6 (diff) | |
| download | abseil-c9f49460fa38cc24c3f476eb2998abca105cf63d.tar.gz abseil-c9f49460fa38cc24c3f476eb2998abca105cf63d.tar.bz2 abseil-c9f49460fa38cc24c3f476eb2998abca105cf63d.zip | |
type_traits: touch up the docs for is_trivially_relocatable.
Clarify that the trait is conservative: it's safe to act on if it's true, but
false doesn't necessarily mean anything. Of course this is the only reasonable
way to use it, but I think it's helpful to be explicit, especially because
currently this trait *always* returns false on some platforms even for a type
like int.
PiperOrigin-RevId: 519272294
Change-Id: Ic63a48dcf18efc0756046b3d6f51d11cbb46a469
Diffstat (limited to 'absl/meta')
| -rw-r--r-- | absl/meta/type_traits.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index fb12ba4a..25462580 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -474,9 +474,14 @@ using swap_internal::StdSwapIsUnconstrained; } // namespace type_traits_internal // absl::is_trivially_relocatable<T> -// Detects whether a type is "trivially relocatable" -- meaning it can be -// relocated without invoking the constructor/destructor, using a form of move -// elision. +// +// Detects whether a type is known to be "trivially relocatable" -- meaning it +// can be relocated without invoking the constructor/destructor, using a form of +// move elision. +// +// This trait is conservative, for backwards compatibility. If it's true then +// the type is definitely trivially relocatable, but if it's false then the type +// may or may not be. // // Example: // |