23 General utilities library [utilities]

23.12 Memory resources [mem.res]

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

23.12.3.1 polymorphic_­allocator constructors [mem.poly.allocator.ctor]

polymorphic_allocator() noexcept;
Effects: Sets memory_­rsrc to get_­default_­resource().
polymorphic_allocator(memory_resource* r);
Requires: r is non-null.
Effects: Sets memory_­rsrc to r.
Throws: Nothing.
[Note
:
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().