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std::forward_list::front

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
 
reference front();
(C++11およびそれ以降)
const_reference front() const;
(C++11およびそれ以降)
コンテナ内の最初の要素への参照を返します.
Original:
Returns a reference to the first element in the container.
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空の容器にfrontを呼び出すと、定義されていません.
Original:
Calling front on an empty container is undefined.
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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

最初の要素への参照
Original:
reference to the first element
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[編集] 複雑

定数
Original:
Constant
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[編集] ノート

コンテナc、発現c.front()*c.begin()と同等です.
Original:
For a container c, the expression c.front() is equivalent to *c.begin().
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[編集]

次のコードは、frontの最初の要素を表示するためにstd::forward_list<char>を使用しています
Original:
The following code uses front to display the first element of a std::forward_list<char>:
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#include <forward_list>
#include <iostream>
 
int main()
{
    std::forward_list<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The first character is: " << letters.front() << '\n';
    }  
}

Output:

The first character is o

None