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### Allocator-related traits <a id="variant.traits">[[variant.traits]]</a>
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``` cpp
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template <class... Types, class Alloc>
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struct uses_allocator<variant<Types...>, Alloc> : true_type { };
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```
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*Requires:* `Alloc` shall be an Allocator ([[allocator.requirements]]).
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[*Note 1*: Specialization of this trait informs other library
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components that variant can be constructed with an allocator, even
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though it does not have a nested `allocator_type`. — *end note*]
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