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std::array::front

提供: cppreference.com
< cpp‎ | container‎ | array

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C++
 
コンテナライブラリ
 
std::array
メンバ関数
Original:
Member functions
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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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array::at
array::operator[]
array::front
array::back
array::data
イテレータ
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
容量
Original:
Capacity
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array::empty
array::size
array::max_size
修飾子
Original:
Modifiers
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array::fill
array::swap
非メンバ関数
Original:
Non-member functions
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get
swap
ヘルパークラス
Original:
Helper classes
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tuple_size
tuple_element
 
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()は*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] 例

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

出力: 

The first character is o

See also

 末尾の要素にアクセスします
(パブリックメンバ関数) [edit]
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