std::iota
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ヘッダ <numeric> で定義 | ||
template<class ForwardIterator, class T > void iota( ForwardIterator first, ForwardIterator last, T value ); | (C++11およびそれ以降) | |
順次
[first, last)始まると繰り返しvalueを評価し、値を大きくすると、範囲++valueを塗りつぶし.Original:
Fills the range
[first, last) with sequentially increasing values, starting with value and repetitively evaluating ++value.The text has been machine-translated via Google Translate.
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同等の操作：
Original:
Equivalent operation:
The text has been machine-translated via Google Translate.
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*(d_first)= value;*(d_first+1)=++value;*(d_first+2)=++value;*(d_first+3)=++value; ...
目次 |
[編集]パラメータ
| first, last | - | 和への要素の範囲 Original: the range of elements to sum The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| value | - | 店舗への初期値、式+ +値は整形式でなければなりません Original: initial value to store, the expression ++value must be well-formed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[編集]値を返します
(なし)
[編集]複雑性
まさに
last - firstインクリメントと代入.Original:
Exactly
last - first increments and assignments.The text has been machine-translated via Google Translate.
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[編集]可能な実装
template<class ForwardIterator, class T>void iota(ForwardIterator first, ForwardIterator last, T value){while(first != last){*first++= value;++value;}} |
[編集]例
std::random_shuffleが直接std::listに適用することはできませんので、以下の例では、std::random_shuffleにイテレータのベクトルにstd::list適用されます。 std::iotaは、ベクトルを作成するために使用され.
Original:
The following example applies std::random_shuffle to a vector of iterators to a std::list since std::random_shuffle cannot be applied to an std::list directly. std::iota is used to create the vector.
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Run this code
#include <numeric>#include <algorithm>#include <list>#include <vector>#include <iostream> int main(){std::list<int> l(10); std::iota(l.begin(), l.end(), -4); std::vector<std::list<int>::iterator> v(l.size()); std::iota(v.begin(), v.end(), l.begin()); std::random_shuffle(v.begin(), v.end()); std::cout<<"Contents of the list: ";for(auto n: l){std::cout<< n <<' ';}std::cout<<'\n'; std::cout<<"Contents of the list, shuffled: ";for(auto i: v){std::cout<<*i <<' ';}std::cout<<'\n';}
出力:
Contents of the list: -4 -3 -2 -1 0 1 2 3 4 5 Contents of the list, shuffled: 0 -1 3 4 -4 1 -2 -3 2 5
[編集]参照
| 指定された要素を範囲内の全要素にコピー代入します (関数テンプレート) | |
| 関数を連続的に呼び出した結果を指定範囲の全要素に代入します (関数テンプレート) |
