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std::forward_list::empty

提供: cppreference.com

 
 
 
std::forward_list
メンバ関数
Original:
Member functions
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forward_list::forward_list
forward_list::~forward_list
forward_list::operator=
forward_list::assign
forward_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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forward_list::front
イテレータ
Original:
Iterators
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forward_list::before_begin
forward_list::cbefore_begin
forward_list::begin
forward_list::cbegin
forward_list::end
forward_list::cend
容量
Original:
Capacity
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forward_list::empty
forward_list::max_size
修飾子
Original:
Modifiers
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forward_list::clear
forward_list::insert_after
forward_list::emplace_after
forward_list::erase_after
forward_list::push_front
forward_list::emplace_front
forward_list::pop_front
forward_list::resize
forward_list::swap
操作
Original:
Operations
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forward_list::merge
forward_list::splice_after
forward_list::remove
forward_list::remove_if
forward_list::reverse
forward_list::unique
forward_list::sort
 
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().
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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::forward_list<int>使用しています
Original:
The following code uses empty to check if a std::forward_list<int> contains any elements:
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#include <forward_list>
#include <iostream>
 
int main()
{
    std::forward_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

None