Test multiple Python versions.

Py_REFCNT was stabilized in 3.9, uses this official API instead of the
`ob_refcnt` field that doesn't exist in the free-threaded build of 3.13.

.github/workflows/test-osx.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8.10]
+        python-version: ['3.8.10', '3.12']
         cxx: [clang++]
         std: [c++11, c++14] # TODO: c++17 is failing !
 
@@ -32,17 +32,19 @@ jobs:
         faber -v
         sed -e "s/\$PYTHON/python/g" .ci/faber > ~/.faber
         faber \
-          --with-boost-include=/opt/homebrew/Cellar/boost/1.86.0/include \
+          --with-boost-include=$(brew --prefix boost)/include \
           --builddir=build \
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
+          cppflags=-std=${{ matrix.std }} \
           -j`sysctl -n hw.ncpu`
     - name: test
       run: |
         faber \
-          --with-boost-include=/opt/homebrew/Cellar/boost/1.86.0/include \
+          --with-boost-include=$(brew --prefix boost)/include \
           --builddir=build\
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
+          cppflags=-std=${{ matrix.std }} \
           -j`sysctl -n hw.ncpu` \
           test.report

.github/workflows/test-ubuntu.yml

@@ -39,6 +39,7 @@ jobs:
           --builddir=build \
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
+          cppflags=-std=${{ matrix.std }} \
           -j`nproc`
     - name: test
       run: |
@@ -47,5 +48,6 @@ jobs:
           --builddir=build \
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
+          cppflags=-std=${{ matrix.std }} \
           -j`nproc` \
           test.report

doc/numpy/_static/boost.css

@@ -714,3 +714,23 @@ span.purple { color: purple; }
 span.gold { color: gold; }
 span.silver { color: silver; } /* lighter gray */
 span.gray { color: #808080; } /* light gray */
+
+/* 2022 fix */
+
+ol.simple ol p,
+ol.simple ul p,
+ul.simple ol p,
+ul.simple ul p {
+    margin-top: 0;
+}
+
+ol.simple > li:not(:first-child) > p,
+ul.simple > li:not(:first-child) > p {
+    margin-top: 0;
+}
+
+ol.simple p,
+ul.simple p {
+    margin-bottom: 0;
+}
+

doc/numpy/_templates/layout.html

@@ -49,6 +49,9 @@
     {%- for scriptfile in script_files %}
     <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
     {%- endfor %}
+    <script data-url_root="{{ pathto('', 1) }}" id="documentation_options" src="{{ pathto('', 1) }}_static/documentation_options.js"></script>
+    <script src="{{ pathto('', 1) }}_static/searchtools.js"></script>
+    <script src="{{ pathto('', 1) }}_static/language_data.js"></script>
     {%- if use_opensearch %}
     <link rel="search" type="application/opensearchdescription+xml"
           title="{% trans docstitle=docstitle|e %}Search within {{ docstitle }}{% endtrans %}"

include/boost/python/object_operators.hpp

@@ -9,7 +9,7 @@
 
 # include <boost/python/object_core.hpp>
 # include <boost/python/call.hpp>
-# include <boost/iterator/detail/enable_if.hpp>
+# include <boost/type_traits/enable_if.hpp>
 # include <boost/mpl/bool.hpp>
 
 # include <boost/iterator/detail/config_def.hpp>
@@ -40,7 +40,7 @@ struct is_object_operators
 # if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
 template <class L, class R, class T>
 struct enable_binary
-  : boost::iterators::enable_if<is_object_operators<L,R>, T>
+  : boost::enable_if_<is_object_operators<L,R>::value, T>
 {};
 #  define BOOST_PYTHON_BINARY_RETURN(T) typename enable_binary<L,R,T>::type
 # else

src/converter/from_python.cpp

@@ -222,7 +222,13 @@ namespace
       , char const* ref_type)
   {
       handle<> holder(source);
-      if (source->ob_refcnt <= 1)
+      if (
+#if PY_VERSION_HEX < 0x03090000
+                source->ob_refcnt
+#else
+                Py_REFCNT(source)
+#endif
+                <= 1)
       {
           handle<> msg(
 #if PY_VERSION_HEX >= 0x3000000