20 Memory management library [mem]

20.4 Memory resources [mem.res]

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

20.4.3.2 Constructors [mem.poly.allocator.ctor]

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polymorphic_allocator() noexcept;
1
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Effects: Sets memory_rsrc to get_default_resource().
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polymorphic_allocator(memory_resource* r);
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Preconditions: r is non-null.
3
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Effects: Sets memory_rsrc to r.
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Throws: Nothing.
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[Note 1: 
This constructor provides an implicit conversion from memory_resource*.
— end note]
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template<class U> polymorphic_allocator(const polymorphic_allocator<U>& other) noexcept;
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Effects: Sets memory_rsrc to other.resource().