名前空間
変種
操作

std::unordered_set::empty

提供: cppreference.com

 
 
 
のstd :: unordered_set
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.
unordered_set::unordered_set
unordered_set::~unordered_set
unordered_set::operator=
unordered_set::get_allocator
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.
unordered_set::begin
unordered_set::cbegin
unordered_set::end
unordered_set::cend
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.
unordered_set::erase
unordered_set::size
unordered_set::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.
unordered_set::clear
unordered_set::insert
unordered_set::emplace
unordered_set::emplace_hint
unordered_set::erase
unordered_set::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.
unordered_set::count
unordered_set::find
unordered_set::equal_range
バケットインターフェイス
Original:
Bucket interface
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unordered_set::begin2
unordered_set::end2
unordered_set::bucket_count
unordered_set::max_bucket_count
unordered_set::bucket_size
unordered_set::bucket
ハッシュポリシー
Original:
Hash policy
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unordered_set::load_factor
unordered_set::max_load_factor
unordered_set::rehash
unordered_set::reserve
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.
unordered_set::hash_function
unordered_set::key_eq
 
bool empty() const;
(C + + 11以来)
小切手コンテナに要素がない場合、すなわちかどうかbegin() == end().
Original:
Checks if the container has no elements, i.e. whether begin() == end().
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

目次

[編集] パラメータ

(なし)
Original:
(none)
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

true容器が空であれば、そうでなければfalse
Original:
true if the container is empty, false otherwise
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集] 複雑

定数
Original:
Constant
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[編集]

次のコードは、emptyに要素が含まれているかどうかをチェックするためにstd::unordered_set<int>使用しています
Original:
The following code uses empty to check if a std::unordered_set<int> contains any elements:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <unordered_set>
#include <iostream>
 
int main()
{
    std::unordered_set<int> numbers;
    std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
 
    numbers.push_back(42);
    numbers.push_back(13317); 
    std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}

Output:

Initially, numbers.empty(): 1
After adding elements, numbers.empty(): 0

See also

要素数を返します
Original:
returns the number of elements
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(パブリックメンバ関数) [edit]