20 Memory management library [mem]

20.5 Memory resources [mem.res]

20.5.3 Class template polymorphic_allocator [mem.poly.allocator.class]

20.5.3.2 Constructors [mem.poly.allocator.ctor]

polymorphic_allocator() noexcept;
Effects: Sets memory_rsrc to get_default_resource().
polymorphic_allocator(memory_resource* r);
[Note 1: 
This constructor provides an implicit conversion from memory_resource*.
— end note]
template<class U> polymorphic_allocator(const polymorphic_allocator<U>& other) noexcept;
Effects: Sets memory_rsrc to other.resource().

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