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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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