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std::deque::front

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
 
reference front();
const_reference front() const;
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::deque<char>を使用しています
Original:
The following code uses front to display the first element of a std::deque<char>:
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#include <deque>
#include <iostream>
 
int main()
{
    std::deque<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

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]