Merge branch 'master' into feature/forward-bulk

Author: charan-003

cmake/HPX_AddConfigTest.cmake

@@ -570,15 +570,6 @@ function(hpx_check_for_cxx20_std_construct_at)
   )
 endfunction()
 
-# ##############################################################################
-function(hpx_check_for_cxx20_std_bit_cast)
-  add_hpx_config_test(
-    HPX_WITH_CXX20_STD_BIT_CAST
-    SOURCE cmake/tests/cxx20_std_bit_cast.cpp
-    FILE ${ARGN}
-  )
-endfunction()
-
 # ##############################################################################
 function(hpx_check_for_cxx23_std_generator)
   add_hpx_config_test(

cmake/HPX_PerformCxxFeatureTests.cmake

@@ -122,7 +122,6 @@ function(hpx_perform_cxx_feature_tests)
       DEFINITIONS HPX_HAVE_CXX20_STD_CONSTRUCT_AT
     )
 
-    hpx_check_for_cxx20_std_bit_cast(DEFINITIONS HPX_HAVE_CXX20_STD_BIT_CAST)
   endif()
 
   if(HPX_WITH_CXX20_COROUTINES)

cmake/templates/std_headers.hpp.in

@@ -44,9 +44,7 @@
 # endif
 #endif
 
-#if defined(HPX_HAVE_CXX20_STD_BIT_CAST) || defined(HPX_HAVE_CXX20_STD_ENDIAN)
-# include <bit>
-#endif
+#include <bit>
 #if defined(HPX_HAVE_CXX20_SOURCE_LOCATION)
 # include <source_location>
 #endif

cmake/tests/cxx20_std_bit_cast.cpp

@@ -4,12 +4,18 @@
 # 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)
 
-set(tests partitioned_vector_2201 partitioned_vector_constructor_6650)
+set(tests partitioned_vector_2201 partitioned_vector_constructor_6650
+          partitioned_vector_fewer_partitions_than_localities
+)
 
 set(partitioned_vector_2201_FLAGS COMPONENT_DEPENDENCIES partitioned_vector)
 set(partitioned_vector_constructor_6650_FLAGS COMPONENT_DEPENDENCIES
                                               partitioned_vector
 )
+set(partitioned_vector_fewer_partitions_than_localities_FLAGS
+    COMPONENT_DEPENDENCIES partitioned_vector
+)
+set(partitioned_vector_fewer_partitions_than_localities_PARAMETERS LOCALITIES 3)
 
 foreach(test ${tests})
   set(sources ${test}.cpp)

components/containers/partitioned_vector/tests/regressions/CMakeLists.txt

@@ -0,0 +1,63 @@
+//  Copyright (c) 2026 Mo'men Samir
+//
+//  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)
+
+// Regression test to make sure default distribution policy works correctly
+// when the number of localities is more than the number partitions
+
+#include <hpx/config.hpp>
+#if !defined(HPX_COMPUTE_DEVICE_CODE)
+#include <hpx/hpx_main.hpp>
+#include <hpx/include/partitioned_vector_predef.hpp>
+#include <hpx/include/runtime.hpp>
+#include <hpx/modules/testing.hpp>
+
+#include <cstddef>
+#include <vector>
+
+///////////////////////////////////////////////////////////////////////////////
+template <typename T, typename InIter>
+void verify_values(InIter first, InIter last, T const& val)
+{
+    for (InIter it = first; it != last; ++it)
+    {
+        HPX_TEST_EQ(*it, val);
+    }
+}
+
+template <typename T>
+void test_with_policy(std::size_t length, std::size_t num_partitions,
+    std::vector<hpx::id_type> const& localities)
+{
+    hpx::partitioned_vector<T> v(
+        length, T(42), hpx::container_layout(num_partitions, localities));
+
+    verify_values(v.begin(), v.end(), T(42));
+    HPX_TEST_EQ(v.size(), length);
+}
+
+template <typename T>
+void test_partition_locality_combinations()
+{
+    std::vector<hpx::id_type> localities = hpx::find_all_localities();
+    std::size_t const nlocs = localities.size();
+    std::size_t const length = 12;
+
+    // fewer partitions than localities
+    if (nlocs >= 2)
+        test_with_policy<T>(length, nlocs - 1, localities);
+
+    // same number of partitions as localities
+    test_with_policy<T>(length, nlocs, localities);
+}
+
+int main()
+{
+    test_partition_locality_combinations<int>();
+    test_partition_locality_combinations<double>();
+
+    return hpx::util::report_errors();
+}
+#endif