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Showing content from https://timsong-cpp.github.io/cppwp/n4659/variant.traits below:

[variant.traits]

23 General utilities library [utilities] 23.7 Variants [variant] 23.7.13 Allocator-related traits [variant.traits]

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

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Requires: Alloc shall be an Allocator.

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


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