[Spatial] [spatial:tickets] #6 C++20 std::allocator::rebind is deprecated

[Dario M. <dm...@us...>]

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** [tickets:#6] C++20 std::allocator::rebind is deprecated**

**Status:** open
**Milestone:** 2.1.9
**Created:** Sat Mar 06, 2021 03:07 PM UTC by Dario Mariani
**Last Updated:** Sat Mar 06, 2021 03:07 PM UTC
**Owner:** nobody


In std::allocator, the member rebind, construct and destroy were deprecated in C++20 and other allocators are doing the same (e.g. Intel OneTBB). A possible solution is:
~~~
-      typedef typename Alloc::template rebind
-      <Kdtree_link<Key, Value> >::other               Link_allocator;
-      typedef typename Alloc::template rebind
-      <value_type>::other                             Value_allocator;
+      using Link_allocator  = std::allocator_traits<Alloc>::template rebind_alloc<Kdtree_link<Key, Value>>;
+      using Value_allocator = std::allocator_traits<Alloc>::template rebind_alloc<value_type>;
~~~
and
~~~
-        get_value_allocator().construct(mutate_pointer(&safe.link->value),
-                                        value);
+        Value_allocator v_alloc = get_value_allocator();
+        std::allocator_traits<Value_allocator>::construct(v_alloc, mutate_pointer(&safe.link->value), value);
~~~


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