From 4a3ec94cf3f57d445865d122f1894e76d6618506 Mon Sep 17 00:00:00 2001
From: Darshan Sen <raisinten@gmail.com>
Date: Thu, 30 Mar 2023 15:44:14 +0530
Subject: [PATCH] src: remove usage of `std::shared_ptr<T>::unique()`
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

`std::shared_ptr<T>::unique()` has been removed in C++20, so this change
uses `std::shared_ptr<T>::use_count()` instead which is available in
C++20.

Fixes: https://github.com/nodejs/node/issues/47311
Signed-off-by: Darshan Sen <raisinten@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/47315
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 src/node_threadsafe_cow-inl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/node_threadsafe_cow-inl.h b/src/node_threadsafe_cow-inl.h
index 875b38766063f6..1cd0055ed8079f 100644
--- a/src/node_threadsafe_cow-inl.h
+++ b/src/node_threadsafe_cow-inl.h
@@ -7,7 +7,7 @@ namespace node {
 
 template <typename T>
 T* CopyOnWrite<T>::write() {
-  if (!data_.unique()) {
+  if (data_.use_count() > 1l) {
     data_ = std::make_shared<T>(*data_);
   }
   return data_.get();