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std::unordered_map::emplace

提供: cppreference.com

 
 
 
std::unordered_map
メンバ関数
Original:
Member functions
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unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
イテレータ
Original:
Iterators
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unordered_map::begin
unordered_map::cbegin
unordered_map::end
unordered_map::cend
容量
Original:
Capacity
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unordered_map::erase
unordered_map::size
unordered_map::max_size
修飾子
Original:
Modifiers
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unordered_map::clear
unordered_map::insert
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::erase
unordered_map::swap
ルック
Original:
Lookup
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unordered_map::count
unordered_map::find
unordered_map::equal_range
バケットインターフェイス
Original:
Bucket interface
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unordered_map::begin2
unordered_map::end2
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket
ハッシュポリシー
Original:
Hash policy
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unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
オブザーバー
Original:
Observers
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unordered_map::hash_function
unordered_map::key_eq
 
template< class... Args >
std::pair<iterator,bool> emplace( Args&&... args );
(C + + 11以来)
容器への挿入は、新しい要素。要素はその場で構成され、操作が実行されないコピーや移動、すなわちません。 The constructor of the element type (value_type, that is, std::pair<const Key, T>) is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....
Original:
Inserts a new element to the container. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element type (value_type, that is, std::pair<const Key, T>) is called with exactly the same arguments as supplied to the function, forwarded with std::forward<Args>(args)....
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If rehashing occurs due to the insertion, all iterators are invalidated. Otherwise iterators are not affected. References are not invalidated. Rehashing occurs only if the new number of elements is higher than max_load_factor()*bucket_count().

目次

[編集] パラメータ

args -
要素のコンストラクタに転送するための引数
Original:
arguments to forward to the constructor of the element
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[編集] 値を返します

returns a pair consisting of a bool denoting whether the insertion took place and an iterator to the inserted element.

[編集] 複雑

Amortized constant on average, worst case linear in the size of the container.

[編集] も参照してください

ヒントを使用してその場で要素を構成します
Original:
constructs elements in-place using a hint
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(パブリックメンバ関数) [edit]
要素を挿入します
(パブリックメンバ関数) [edit]