Merge pull request #6143 from dimitraka/doc_updates

Add list of new namespaces for new release

docs/sphinx/releases.rst

@@ -11,6 +11,9 @@
 Releases
 ========
 
+List of releases
+================
+
 .. toctree::
    :maxdepth: 1
 
@@ -41,3 +44,12 @@ Releases
    releases/whats_new_0_8_1
    releases/whats_new_0_8_0
    releases/whats_new_0_7_0
+
+
+Namespace changes
+=================
+
+.. toctree::
+   :maxdepth: 1
+
+   releases/new_namespaces_1_9_0

docs/sphinx/releases/new_namespaces_1_9_0.rst

@@ -0,0 +1,36 @@
+..
+    Copyright (C) 2023 Dimitra Karatza
+
+    SPDX-License-Identifier: BSL-1.0
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+.. _new_namespaces_1_9_0:
+
+==============================
+|hpx| V1.9.0 Namespace changes
+==============================
+
+The latest release includes amongst others changes in the namespaces so that |hpx|
+facilities correspond to the C++ Standard Library. The old namespaces are
+deprecated. Below is a comprehensive list of the namespace changes.
+
+.. table:: Namespace changes in V1.9.0
+
+   ===========================================================  ==============================================================
+   Old namespace                                                New namespace
+   ===========================================================  ==============================================================
+   :cpp:func:`hpx::util::mem_fn`                                :cpp:func:`hpx::mem_fn`
+   :cpp:func:`hpx::util::invoke`                                :cpp:func:`hpx::invoke`
+   :cpp:func:`hpx::util::invoke_r`                              :cpp:func:`hpx::invoke_r`
+   :cpp:func:`hpx::util::invoke_fused`                          :cpp:func:`hpx::invoke_fused`
+   :cpp:func:`hpx::util::invoke_fused_r`                        :cpp:func:`hpx::invoke_fused_r`
+   :cpp:class:`hpx::util::unlock_guard`                         :cpp:class:`hpx::unlock_guard`
+   :cpp:func:`hpx::parallel::v1::reduce_by_key`                 :cpp:func:`hpx::experimental::reduce_by_key`
+   :cpp:func:`hpx::parallel::v1::sort_by_key`                   :cpp:func:`hpx::experimental::sort_by_key`
+   :cpp:class:`hpx::parallel::task_canceled_exception`          :cpp:class:`hpx::experimental::task_canceled_exception`
+   :cpp:class:`hpx::parallel::task_block`                       :cpp:class:`hpx::experimental::task_block`
+   :cpp:func:`hpx::parallel::define_task_block`                 :cpp:func:`hpx::experimental::define_task_block`                |
+   :cpp:func:`hpx::parallel::define_task_block_restore_thread`  :cpp:func:`hpx::experimental::define_task_block_restore_thread`
+   :cpp:class:`hpx::execution::experimental::task_group`        :cpp:class:`hpx::experimental::task_group`
+   ===========================================================  ==============================================================