From: ddzama <ddzama@opencascade.com>
Date: Mon, 4 Apr 2022 04:29:42 +0000 (+0300)
Subject: 0032920: Coding - fix checking of std::stringstream buffer size on VS2019/C++20
X-Git-Tag: V7_7_0_beta~112
X-Git-Url: http://git.dev.opencascade.org/gitweb/?a=commitdiff_plain;h=e976df232941aae838b8c3dcf4b9f79f79bea705;p=occt.git

0032920: Coding - fix checking of std::stringstream buffer size on VS2019/C++20

Use tellp() instead of in_avail() for testing non-empty std::stringstream state.
---

diff --git a/src/Message/Message_Messenger.hxx b/src/Message/Message_Messenger.hxx
index a804a6c527..3ee2ea3d3a 100644
--- a/src/Message/Message_Messenger.hxx
+++ b/src/Message/Message_Messenger.hxx
@@ -72,7 +72,7 @@ public:
     void Flush(Standard_Boolean doForce = Standard_False)
     {
       myStream.flush();
-      if (doForce || myStream.rdbuf()->in_avail() > 0)
+      if (doForce || myStream.tellp() != std::streampos(0))
       {
         if (myMessenger)
         {