32 lines
1.0 KiB
Markdown
32 lines
1.0 KiB
Markdown
[tuple.traits]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.4 Tuples [[tuple]](tuple#traits)
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### 22.4.11 Tuple traits [tuple.traits]
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[ð](#lib:uses_allocator%3ctuple%3e)
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`template<class... Types, class Alloc>
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struct uses_allocator<tuple<Types...>, Alloc> : true_type { };
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L3118)
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*Preconditions*: Alloc meets
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the [*Cpp17Allocator*](allocator.requirements.general#:Cpp17Allocator "16.4.4.6.1 General [allocator.requirements.general]") requirements ([[allocator.requirements.general]](allocator.requirements.general "16.4.4.6.1 General"))[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L3123)
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[*Note [1](#note-1)*:
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Specialization of this trait informs other library components thattuple can be constructed with an allocator, even though it does not have
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a nested allocator_type[.](#2.sentence-1)
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â *end note*]
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