名前空間
変種
操作

std::prev

提供: cppreference.com
< cpp‎ | iterator

 
 
イテレータライブラリ
イテレータプリミティブ
Original:
Iterator primitives
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
イテレータアダプタ
Original:
Iterator adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
reverse_iterator
ストリーム反復子
Original:
Stream iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
イテレータ操作
Original:
Iterator operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
advance
distance
prev(C++11)
next(C++11)
アクセスの範囲
Original:
Range access
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
begin(C++11)
end(C++11)
 
Defined in header <iterator>
template< class BidirIt >

BidirIt prev( BidirIt it,

              typename std::iterator_traits<BidirIt>::difference_type n = 1 );
(C++11およびそれ以降)
イテレータnitth前身を返す.
Original:
Return the nth predecessor of iterator it.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

目次

[編集] パラメータ

it -
イテレータ
Original:
an iterator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
n -
itが降りなければならない要素の数
Original:
number of elements it should be descended
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Type requirements
-
BidirIt must meet the requirements of BidirectionalIterator.

[編集] 値を返します

イテレータnitth前身.
Original:
The nth predecessor of iterator it.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[編集] 可能な実装

template<class BidirIt>
BidirIt prev(BidirIt it, typename std::iterator_traits<BidirIt>::difference_type n = 1)
{
    std::advance(it, -n);
    return it;
}

[編集]

#include <iostream>
#include <iterator>
#include <vector>
 
int main() 
{
    std::vector<int> v{ 3, 1, 4 };
 
    auto it = v.end();
 
    auto pv = std::prev(it, 2);
 
    std::cout << *pv << '\n';
}

Output:

1

[編集] も参照してください

(C++11)
イテレータをインクリメントします
Original:
increment an iterator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(関数) [edit]
指定された距離によって進歩イテレータ
Original:
advances an iterator by given distance
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(関数) [edit]