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      std::fill_n

      提供: cppreference.com
      < cpp‎ | algorithm

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      C++
       
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      Sorting operations (on sorted ranges)
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      バイナリ検索操作（ソート範囲で）
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      Binary search operations (on sorted ranges)
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      Defined in header <algorithm>
      template<class OutputIt, class Size, class T >

      void fill_n( OutputIt first, Size count, const T& value );
      template<class OutputIt, class Size, class T >

      OutputIt fill_n( OutputIt first, Size count, const T& value );
      		(C++11以前)

      (C++11およびそれ以降)
      value場合countで範囲の先頭で最初first要素に指定された値count>0を割り当てます。そうでなければ何もしません.
      Original:
      Assigns the given value value to the first count elements in the range beginning at first if count>0. Does nothing otherwise.
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      目次

      [編集]パラメータ

      first -
      変更する要素の範囲の先頭
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      the beginning of the range of elements to modify
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      count -
      変更する要素の数
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      number of elements to modify
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      value -
      値が割り当てられる
      Original:
      the value to be assigned
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      型の要件
      -
      OutputIt は OutputIterator

      の要求を満足しなければなりません。

      [編集]値を返します

      （なし）(C++11以前)
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      (none) (C++11以前)
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      count>0、firstそうでない場合、割り当てられた最後の要素の反復子1。 (C++11およびそれ以降)
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      Iterator one past the last element assigned if count>0, first otherwise. (C++11およびそれ以降)
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      [編集]複雑性

      countため正確count>0割り当て、.
      Original:
      Exactly count assignments, for count>0.
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      [編集]可能な実装

      template<class OutputIt, class Size, class T> OutputIt fill_n(OutputIt first, Size count, const T& value){for(Size i =0; i < count; i++){*first++= value;}return first;}

      [編集]例

      次のコードは、整数のベクタの最初の半分に-1を代入するfill_n()使用しています
      Original:
      The following code uses fill_n() to assign -1 to the first half of a vector of integers:
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      このコードを実行します
      #include <algorithm>#include <vector>#include <iostream>   int main(){std::vector<int> v1{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};   std::fill_n(v1.begin(), 5, -1);   for(vector<int>::iterator it = v1.begin(); it != v1.end();++it){std::cout<<*it <<" ";}std::cout<<"\n";}

      出力: 

      -1 -1 -1 -1 -1 5 6 7 8 9

      [編集]参照

      要素の範囲を特定の値を割り当てます
      Original:
      assigns a range of elements a certain value
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