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2005年08月27日

C++ slice

satoru-t が便利で面白い表を作っています。
http://namazu.org/~satoru/blog/archives/000043.html

こうやって見ると C++ はちょっとイビツです。値ベースだから、パフォーマンスを考えると配列を返すようなメソッドはなく、破壊的またはコピーを作る操作になってしまいます。あと、STL はアルゴリズムとコンテナの役割が明確に分かれているので、vector は vector プリミティブのメソッドしかありません。copy や unique は、ランダムアクセスができる iterator を持つものなら vector 以外のコンテナでも動かすことができます。

さて、slice ですが、少々強引ですが

#include <iostream>                                                                                
#include <vector>                                                                                  
#include <iterator>                                                                                
                                                                                                         
int main ()                                                                                              
{                                                                                                        
   std::vector<int>  a;                                                                            
   for (int i = 0; i < 10; ++i) a.push_back(i);                                                       
                                                                                                         
   std::vector<int> b;                                                                             
   std::copy(a.begin() + 2, a.begin() + 2 + 5, std::back_inserter(b));                                   
                                                                                                         
   std::copy(b.begin(), b.end(), std::ostream_iterator<int>(std::cout, " "));                      
   std::cout << std::endl;                                                                         
}
std::back_inseter(v) は、*iterator++ = value を v.push_back(value) にバインドする関数オブジェクトです。

投稿者 taku : 2005年08月27日 22:46

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