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std::vector::operator[]

提供: cppreference.com
< cpp‎ | container‎ | vector

 
 
 
std::vector
メンバ関数
Original:
Member functions
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vector::vector
vector::~vector
vector::operator=
vector::assign
vector::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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vector::at
vector::operator[]
vector::front
vector::back
vector::data(C++11)
イテレータ
Original:
Iterators
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vector::begin
vector::cbegin

(C++11)
vector::end
vector::cend

(C++11)
vector::rbegin
vector::crbegin

(C++11)
vector::rend
vector::crend

(C++11)
容量
Original:
Capacity
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vector::empty
vector::size
vector::max_size
vector::reserve
vector::capacity
vector::shrink_to_fit(C++11)
修飾子
Original:
Modifiers
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vector::clear
vector::insert
vector::emplace(C++11)
vector::erase
vector::push_back
vector::emplace_back(C++11)
vector::pop_back
vector::resize
vector::swap
 
reference       operator[]( size_type pos );
const_reference operator[]( size_type pos ) const;
指定された場所のposの要素への参照を返します。境界のチェックは行われません.
Original:
Returns a reference to the element at specified location pos. No bounds checking is performed.
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目次

[編集] パラメータ

pos -
戻り値となる要素の位置
Original:
position of the element to return
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[編集] 値を返します

要求された要素への参照
Original:
reference to the requested element
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[編集] 複雑

定数
Original:
Constant
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[編集]

次のコードは、operator[]からの読み取りとstd::vector<int>に書き込みを使用しています
Original:
The following code uses operator[] read from and write to a std::vector<int>:
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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> numbers {2, 4, 6, 8};
 
    std::cout << "Second element: " << numbers[1] << '\n';
 
    numbers[0] = 5;
 
    std::cout << "All numbers:";
    for (auto i : numbers) {
        std::cout << ' ' << i;
    }
    std::cout << '\n';
}

Output:

Second element: 4
All numbers: 5 4 6 8

[編集] も参照してください

指定された要素にアクセスします。境界チェックを行います。
(パブリックメンバ関数) [edit]