From c9894d1dc38577c4ce50eefe0a944ea8d46d7fc5 Mon Sep 17 00:00:00 2001
From: Abseil Team <absl-team@google.com>
Date: Fri, 30 Oct 2020 10:38:44 -0700
Subject: Export of internal Abseil changes

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dce086fa6e045bed433c664f95a6581b7ffb2d98 by Abseil Team <absl-team@google.com>:

fix spelling error "fulfil" -> "fulfill"

PiperOrigin-RevId: 339898016

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10faa4546b69d8a07f949bc03dd9671231232ad0 by Abseil Team <absl-team@google.com>:

Clarify comments on variant::emplace

PiperOrigin-RevId: 339897241

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0d02261a7a8b9c11e3a4e76dfedf4d95590e2419 by Derek Mauro <dmauro@google.com>:

Use thread_local for ThreadIdentity storage on Apple platforms
that support it

PiperOrigin-RevId: 339698124
GitOrigin-RevId: dce086fa6e045bed433c664f95a6581b7ffb2d98
Change-Id: I8c668b33c805fd5231ceb285652c80f312e5a33a
---
 absl/types/variant.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'absl/types')

diff --git a/absl/types/variant.h b/absl/types/variant.h
index 776d19a1..ac93464b 100644
--- a/absl/types/variant.h
+++ b/absl/types/variant.h
@@ -604,7 +604,10 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> {
 
   // emplace() Functions
 
-  // Constructs a value of the given alternative type T within the variant.
+  // Constructs a value of the given alternative type T within the variant. The
+  // existing value of the variant is destroyed first (provided that
+  // `absl::valueless_by_exception()` is false). Requires that T is unambiguous
+  // in the variant.
   //
   // Example:
   //
@@ -624,7 +627,9 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> {
   }
 
   // Constructs a value of the given alternative type T within the variant using
-  // an initializer list.
+  // an initializer list. The existing value of the variant is destroyed first
+  // (provided that `absl::valueless_by_exception()` is false). Requires that T
+  // is unambiguous in the variant.
   //
   // Example:
   //
@@ -643,7 +648,7 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> {
   }
 
   // Destroys the current value of the variant (provided that
-  // `absl::valueless_by_exception()` is false, and constructs a new value at
+  // `absl::valueless_by_exception()` is false) and constructs a new value at
   // the given index.
   //
   // Example:
@@ -662,7 +667,7 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> {
   }
 
   // Destroys the current value of the variant (provided that
-  // `absl::valueless_by_exception()` is false, and constructs a new value at
+  // `absl::valueless_by_exception()` is false) and constructs a new value at
   // the given index using an initializer list and the provided arguments.
   //
   // Example:
-- 
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