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Showing content from https://cplusplus.com/reference/tuple/tuple/uses_allocator/ below:

class template

<tuple>

std::uses_allocator<tuple>

template <class... Types, class Alloc>  struct uses_allocator<tuple<Types...>,Alloc>;

Uses allocator for tuple

This trait specialization of uses_allocator informs that tuple objects can be constructed with allocators, even though the class does not have any allocator_type member. It is defined in the <tuple> with the same behavior as:

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template <class... Types, class Alloc>
struct uses_allocator<tuple<Types...>, Alloc > : true_type {};