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Showing content from https://timsong-cpp.github.io/cppwp/n4140/tuple.traits below:

20 General utilities library [utilities]

20.4.2.8 Tuple traits [tuple.traits]

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

Requires: Alloc shall be an Allocator ([allocator.requirements]).

1

Note: Specialization of this trait informs other library components that tuple can be constructed with an allocator, even though it does not have a nested allocator_type.  — end note ]


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