Update contrib/restricted/boost/iostreams to 1.81.0

2 files changed, 4 insertions, 3 deletions

diff --git a/contrib/restricted/boost/iostreams/README.md b/contrib/restricted/boost/iostreams/README.md
index 5bdc70d40a6..23cbeaaf27a 100644
--- a/contrib/restricted/boost/iostreams/README.md
+++ b/contrib/restricted/boost/iostreams/README.md
@@ -18,8 +18,8 @@ Distributed under the [Boost Software License, Version 1.0](http://www.boost.org
 
 Branch          | Travis | Appveyor | Coverity Scan | codecov.io | Deps | Docs | Tests |
 :-------------: | ------ | -------- | ------------- | ---------- | ---- | ---- | ----- |
-[`master`](https://github.com/boostorg/iostreams/tree/master) | [![Build Status](https://travis-ci.org/boostorg/iostreams.svg?branch=master)](https://travis-ci.org/boostorg/iostreams) | [![Build status](https://ci.appveyor.com/api/projects/status/github/boostorg/iostreams?branch=master&svg=true)](https://ci.appveyor.com/project/eldiener/iostreams/branch/master) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/16463/badge.svg)](https://scan.coverity.com/projects/boostorg-iostreams) | [![codecov](https://codecov.io/gh/boostorg/iostreams/branch/master/graph/badge.svg)](https://codecov.io/gh/boostorg/iostreams/branch/master)| [![Deps](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/iostreams.html) | [![Documentation](https://img.shields.io/badge/docs-master-brightgreen.svg)](http://www.boost.org/doc/libs/master/doc/html/iostreams.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/iostreams.html)
-[`develop`](https://github.com/boostorg/iostreams/tree/develop) | [![Build Status](https://travis-ci.org/boostorg/iostreams.svg?branch=develop)](https://travis-ci.org/boostorg/iostreams) | [![Build status](https://ci.appveyor.com/api/projects/status/github/boostorg/iostreams?branch=develop&svg=true)](https://ci.appveyor.com/project/eldiener/iostreams/branch/develop) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/16463/badge.svg)](https://scan.coverity.com/projects/boostorg-iostreams) | [![codecov](https://codecov.io/gh/boostorg/iostreams/branch/develop/graph/badge.svg)](https://codecov.io/gh/boostorg/iostreams/branch/develop) | [![Deps](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/iostreams.html) | [![Documentation](https://img.shields.io/badge/docs-develop-brightgreen.svg)](http://www.boost.org/doc/libs/develop/doc/html/iostreams.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/iostreams.html)
+[`master`](https://github.com/boostorg/iostreams/tree/master) | [![Build Status](https://travis-ci.org/boostorg/iostreams.svg?branch=master)](https://travis-ci.org/boostorg/iostreams) | [![Build status](https://ci.appveyor.com/api/projects/status/github/boostorg/iostreams?branch=master&svg=true)](https://ci.appveyor.com/project/eldiener/iostreams/branch/master) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/16463/badge.svg)](https://scan.coverity.com/projects/boostorg-iostreams) | [![codecov](https://codecov.io/gh/boostorg/iostreams/branch/master/graph/badge.svg)](https://codecov.io/gh/boostorg/iostreams/branch/master)| [![Deps](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/iostreams.html) | [![Documentation](https://img.shields.io/badge/docs-master-brightgreen.svg)](https://www.boost.org/doc/libs/master/libs/iostreams/doc/index.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/iostreams.html)
+[`develop`](https://github.com/boostorg/iostreams/tree/develop) | [![Build Status](https://travis-ci.org/boostorg/iostreams.svg?branch=develop)](https://travis-ci.org/boostorg/iostreams) | [![Build status](https://ci.appveyor.com/api/projects/status/github/boostorg/iostreams?branch=develop&svg=true)](https://ci.appveyor.com/project/eldiener/iostreams/branch/develop) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/16463/badge.svg)](https://scan.coverity.com/projects/boostorg-iostreams) | [![codecov](https://codecov.io/gh/boostorg/iostreams/branch/develop/graph/badge.svg)](https://codecov.io/gh/boostorg/iostreams/branch/develop) | [![Deps](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/iostreams.html) | [![Documentation](https://img.shields.io/badge/docs-develop-brightgreen.svg)](https://www.boost.org/doc/libs/develop/libs/iostreams/doc/index.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/iostreams.html)
 
 ### Directories
 
diff --git a/contrib/restricted/boost/iostreams/include/boost/iostreams/filter/zlib.hpp b/contrib/restricted/boost/iostreams/include/boost/iostreams/filter/zlib.hpp
index e57870a510f..e2461fba600 100644
--- a/contrib/restricted/boost/iostreams/include/boost/iostreams/filter/zlib.hpp
+++ b/contrib/restricted/boost/iostreams/include/boost/iostreams/filter/zlib.hpp
@@ -389,7 +389,8 @@ bool zlib_decompressor_impl<Alloc>::filter
     int result = xinflate(zlib::sync_flush);
     after(src_begin, dest_begin, false);
     zlib_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result);
-    return !(eof_ = result == zlib::stream_end);
+    eof_ = result == zlib::stream_end;
+    return !eof_;
 }
 
 template<typename Alloc>