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std::list::empty

提供: cppreference.com
< cpp‎ | container‎ | list

 
 
 
std::list
メンバ関数
Original:
Member functions
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list::list
list::~list
list::operator=
list::assign
list::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
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list::front
list::back
イテレータ
Original:
Iterators
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list::begin
list::cbegin

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

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

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

(C++11)
容量
Original:
Capacity
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list::empty
list::size
list::max_size
修飾子
Original:
Modifiers
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list::clear
list::insert
list::emplace(C++11)
list::erase
list::push_front
list::emplace_front(C++11)
list::pop_front
list::push_back
list::emplace_back(C++11)
list::pop_back
list::resize
list::swap
操作
Original:
Operations
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list::merge
list::splice
list::remove
list::remove_if
list::reverse
list::unique
list::sort
 
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以来)

[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::list<int>使用しています
Original:
The following code uses empty to check if a std::list<int> contains any elements:
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#include <list>
#include <iostream>
 
int main()
{
    std::list<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]