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std::multiset::empty

提供: cppreference.com
< cpp‎ | container‎ | multiset

 
 
 
std::multiset
メンバ関数
Original:
Member functions
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multiset::multiset
multiset::~multiset
multiset::operator=
multiset::get_allocator
イテレータ
Original:
Iterators
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multiset::begin
multiset::cbegin

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

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

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

(C++11)
容量
Original:
Capacity
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multiset::empty
multiset::size
multiset::max_size
修飾子
Original:
Modifiers
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multiset::clear
multiset::insert
multiset::emplace(C++11)
multiset::emplace_hint(C++11)
multiset::erase
multiset::swap
ルック
Original:
Lookup
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multiset::count
multiset::find
multiset::equal_range
multiset::lower_bound
multiset::upper_bound
オブザーバー
Original:
Observers
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multiset::key_comp
multiset::value_comp
 
bool empty() const;
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().
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目次

[編集] パラメータ

(なし)
Original:
(none)
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[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
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集] 複雑

定数
Original:
Constant
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[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::multiset<int>使用しています
Original:
The following code uses empty to check if a std::multiset<int> contains any elements:
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#include <multiset>
#include <iostream>
 
int main()
{
    std::multiset<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
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(パブリックメンバ関数) [edit]