cppdraft_translate/cppdraft/map/cons.md

[map.cons]

23 Containers library [containers]

23.4 Associative containers [associative]

23.4.3 Class template map [map]

23.4.3.2 Constructors, copy, and assignment [map.cons]

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constexpr explicit map(const Compare& comp, const Allocator& = Allocator());

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Effects: Constructs an emptymap using the specified comparison object and allocator.

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Complexity: Constant.

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template<class InputIterator> constexpr map(InputIterator first, InputIterator last, const Compare& comp = Compare(), const Allocator& = Allocator());

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Effects: Constructs an emptymap using the specified comparison object and allocator, and inserts elements from the range [first, last).

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Complexity: Linear in N if the range [first, last) is already sorted with respect to comp and otherwise NlogN, where N is last - first.

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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> constexpr map(from_range_t, R&& rg, const Compare& comp = Compare(), const Allocator& = Allocator());

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Effects: Constructs an empty map using the specified comparison object and allocator, and inserts elements from the range rg.

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Complexity: Linear in N if rg is already sorted with respect to comp and otherwise NlogN, where N is ranges​::​distance(rg).