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std::deque::empty

提供: cppreference.com
< cpp‎ | container‎ | deque

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

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

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

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

(C++11)
容量
Original:
Capacity
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deque::empty
deque::size
deque::max_size
deque::shrink_to_fit
修飾子
Original:
Modifiers
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deque::clear
deque::insert
deque::emplace
deque::erase
deque::push_front
deque::emplace_front
deque::pop_front
deque::push_back
deque::emplace_back
deque::pop_back
deque::resize
deque::swap
 
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::deque<int>使用しています
Original:
The following code uses empty to check if a std::deque<int> contains any elements:
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#include <deque>
#include <iostream>
 
int main()
{
    std::deque<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]