71 lines
2.3 KiB
Markdown
71 lines
2.3 KiB
Markdown
[map.cons]
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# 23 Containers library [[containers]](./#containers)
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## 23.4 Associative containers [[associative]](associative#map.cons)
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### 23.4.3 Class template map [[map]](map#cons)
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#### 23.4.3.2 Constructors, copy, and assignment [map.cons]
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[ð](#lib:map,constructor)
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`constexpr explicit map(const Compare& comp, const Allocator& = Allocator());
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11751)
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*Effects*: Constructs an emptymap using the specified comparison object and allocator[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11757)
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*Complexity*: Constant[.](#2.sentence-1)
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[ð](#lib:map,constructor_)
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`template<class InputIterator>
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constexpr map(InputIterator first, InputIterator last,
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const Compare& comp = Compare(), const Allocator& = Allocator());
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`
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11770)
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*Effects*: Constructs an emptymap using the specified comparison object and allocator,
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and inserts elements from the range
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[first, last)[.](#3.sentence-1)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11778)
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*Complexity*: Linear in N if the range
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[first, last)
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is already sorted with respect to comp and otherwise NlogN, where N is last - first[.](#4.sentence-1)
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[ð](#lib:map,constructor__)
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`template<[container-compatible-range](container.intro.reqmts#concept:container-compatible-range "23.2.2.1 Introduction [container.intro.reqmts]")<value_type> R>
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constexpr map(from_range_t, R&& rg, const Compare& comp = Compare(),
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const Allocator& = Allocator());
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`
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[5](#5)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11795)
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*Effects*: Constructs an empty map using the specified comparison object and allocator,
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and inserts elements from the range rg[.](#5.sentence-1)
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[6](#6)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L11801)
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*Complexity*: Linear in N if rg is already sorted with respect to comp and
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otherwise NlogN, where N is ranges::distance(rg)[.](#6.sentence-1)
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