From a6e034adb9cdffda1254e0fcd1204b7917dc5195 Mon Sep 17 00:00:00 2001
From: Jiawei Ou <ouj@fb.com>
Date: Sat, 24 Nov 2018 20:59:41 -0800
Subject: [PATCH] Rebase std::is_trivially_* with absl::is_trivially_*

std::is_trivially_* is not available on certain old STL
implementations. Using absl implementation will allow
maximized compatibility.

Bug: webrtc:10054
Change-Id: I17ed0fff44328b3d7c51d14e8c4470f1df0e66ad
Reviewed-on: https://webrtc-review.googlesource.com/c/111728
Commit-Queue: Jiawei Ou <ouj@fb.com>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25788}
---
 DEPS                 | 1 +
 abseil-in-webrtc.md  | 3 +++
 rtc_base/BUILD.gn    | 3 +++
 rtc_base/sanitizer.h | 8 ++++----
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/DEPS b/DEPS
index 4d9e3654f3..7cbdebfc59 100644
--- a/DEPS
+++ b/DEPS
@@ -1447,6 +1447,7 @@ include_rules = [
   # Abseil whitelist. Keep this in sync with abseil-in-webrtc.md.
   "+absl/container/inlined_vector.h",
   "+absl/memory/memory.h",
+  "+absl/meta/type_traits.h",
   "+absl/strings/ascii.h",
   "+absl/strings/match.h",
   "+absl/strings/string_view.h",
diff --git a/abseil-in-webrtc.md b/abseil-in-webrtc.md
index ae9facf6d4..1075aa9b79 100644
--- a/abseil-in-webrtc.md
+++ b/abseil-in-webrtc.md
@@ -16,6 +16,9 @@ adds the first use.
 * `absl::optional` and related stuff from `absl/types/optional.h`.
 * `absl::string_view`
 * The functions in `absl/strings/ascii.h` and `absl/strings/match.h`
+* `absl::is_trivially_copy_constructible`,
+  `absl::is_trivially_copy_assignable`, and
+  `absl::is_trivially_destructible` from `absl/meta/type_traits.h`.
 * `absl::variant` and related stuff from `absl/types/variant.h`.
 
 ## **Disallowed**
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 27bf5dfe6f..75c4397ab7 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -379,6 +379,9 @@ rtc_source_set("sanitizer") {
   sources = [
     "sanitizer.h",
   ]
+  deps = [
+    "//third_party/abseil-cpp/absl/meta:type_traits",
+  ]
 }
 
 rtc_source_set("safe_compare") {
diff --git a/rtc_base/sanitizer.h b/rtc_base/sanitizer.h
index a9eccfcc94..8af0824b67 100644
--- a/rtc_base/sanitizer.h
+++ b/rtc_base/sanitizer.h
@@ -14,7 +14,7 @@
 #include <stddef.h>  // For size_t.
 
 #ifdef __cplusplus
-#include <type_traits>
+#include "absl/meta/type_traits.h"
 #endif
 
 #if defined(__has_feature)
@@ -98,10 +98,10 @@ namespace sanitizer_impl {
 
 template <typename T>
 constexpr bool IsTriviallyCopyable() {
-  return static_cast<bool>(std::is_trivially_copy_constructible<T>::value &&
-                           (std::is_trivially_copy_assignable<T>::value ||
+  return static_cast<bool>(absl::is_trivially_copy_constructible<T>::value &&
+                           (absl::is_trivially_copy_assignable<T>::value ||
                             !std::is_copy_assignable<T>::value) &&
-                           std::is_trivially_destructible<T>::value);
+                           absl::is_trivially_destructible<T>::value);
 }
 
 }  // namespace sanitizer_impl