名前空間
変種
操作

std::map::operator[]

提供: cppreference.com
< cpp‎ | container‎ | map

 
 
 
std::map
メンバ関数
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::map
map::~map
map::operator=
map::get_allocator
要素アクセスの循環参照を解除するために使用されている
Original:
Element access
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::at
map::operator[]
イテレータ
Original:
Iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::begin
map::cbegin

(C++11)
map::end
map::cend

(C++11)
map::rbegin
map::crbegin

(C++11)
map::rend
map::crend

(C++11)
容量
Original:
Capacity
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::empty
map::size
map::max_size
修飾子
Original:
Modifiers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
ルック
Original:
Lookup
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
オブザーバー
Original:
Observers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
map::key_comp
map::value_comp
 
T& operator[]( const Key& key );
(1)
T& operator[]( Key&& key );
(2) (C++11およびそれ以降)
挿入したキーおよびデフォルトを構築マップされた値としてkeyを使用してコンテナに新しい要素を、新しく構築されたマップされた値への参照を返します。キーkey持つ要素が既に存在する場合、挿入は行われませんし、そのマッピングされた値への参照が返されます.
Original:
Inserts a new element to the container using key as the key and default constructed mapped value and returns a reference to the newly constructed mapped value. If an element with key key already exists, no insertion is performed and a reference to its mapped value is returned.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
1)
本質的に(insert(std::make_pair(key, T())).first)->secondを行い.
Original:
Essentially performs (insert(std::make_pair(key, T())).first)->second.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
2)
本質的に(insert(std::make_pair(std::move(key), T())).first)->secondを行い.
Original:
Essentially performs (insert(std::make_pair(std::move(key), T())).first)->second.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

No iterators or references are invalidated.

目次

[編集] パラメータ

key -
検索する要素のキー
Original:
the key of the element to find
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[編集] 値を返します

新しい要素のマッピングされた値への参照キーkey持つ要素が存在しなかった場合そうしないと、既存の要素のマッピングされた値への参照が返されます.
Original:
Reference to the mapped value of the new element if no element with key key existed. Otherwise a reference to the mapped value of the existing element is returned.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[編集] 複雑

Logarithmic in the size of the container.

[編集]

[編集] も参照してください

(C++11)
指定された要素にアクセスします。境界チェックを行います。
(パブリックメンバ関数) [edit]