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std::multimap::empty

提供: cppreference.com
< cpp‎ | container‎ | multimap

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

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

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

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

(C++11)
容量
Original:
Capacity
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multimap::erase
multimap::size
multimap::max_size
修飾子
Original:
Modifiers
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multimap::clear
multimap::insert
multimap::emplace(C++11)
multimap::emplace_hint(C++11)
multimap::erase
multimap::swap
ルック
Original:
Lookup
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multimap::count
multimap::find
multimap::equal_range
multimap::lower_bound
multimap::upper_bound
オブザーバー
Original:
Observers
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multimap::key_comp
multimap::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::multimap<int>使用しています
Original:
The following code uses empty to check if a std::multimap<int> contains any elements:
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#include <multimap>
#include <iostream>
 
int main()
{
    std::multimap<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]