std::vector::back

 

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std::vector

メンバ関数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::vector

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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::at

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vector::front

vector::back

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イテレータ Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::begin vector::cbegin (C++11)

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reference back();
const_reference back() const;

コンテナ内の最後の要素への参照を返します.

Original:

Returns reference to the last element in the container.

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空の容器にbackを呼び出すと、定義されていません.

Original:

Calling back on an empty container is undefined.

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パラメータ

（なし）

Original:

(none)

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値を返します

最後の要素への参照

Original:

reference to the last element

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複雑

定数

Original:

Constant

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ノート

コンテナc、発現return c.back();は{ auto tmp = c.end(); --tmp; return *tmp; }に相当します

Original:

For a container c, the expression return c.back(); is equivalent to { auto tmp = c.end(); --tmp; return *tmp; }

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例

次のコードは、backの最後の要素を表示するためにstd::vector<char>を使用しています

Original:

The following code uses back to display the last element of a std::vector<char>:

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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The last character is: " << letters.back() << '\n';
    }  
}

Output:

The last character is f

も参照してください

front	最初の要素にアクセスします Original: access the first element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)