February 2017
Intermediate to advanced
368 pages
8h 21m
Japanese
Content preview from Optimized C++ ―最適化、高速化のためのプログラミングテクニック
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208
10 章 データ構造を最適化する
10.1.1
シーケンスコンテナ
シーケンスコンテナ
std::string
、
std::vector
、
std::deque
、
std::list
、
std::forward_list
では、要素を挿入順に保持する。したがって、コンテナには、先頭と末尾がある。また、すべての
シーケンスコンテナには、要素を挿入する関数がある。
std::forward_list
を除いて、末尾に要素
を追加する定数時間メンバ関数がある。しかし、
std::deque
、
std::list
、
std::forward_list
だ
けが要素を先頭に効率的に追加できる。
std::string
、
std::vector
、
std::deque
の要素には、
0
から
size
–1
まで番号が付けられ、添字
で効率的に取り出せる。
std::list
、
std::forward_list
はそれと異なり、添字演算子を持たない。
std::string
、
std::vector
、
std::deque
は配列のような内部骨格で構築される。要素挿入で
は、それ以降の要素は配列の次の位置に移され、末尾以外の挿入コストが
n
を移動要素の個数と
して、
O(n)
となる。要素挿入では、内部配列を再割り当てする必要が生じることもあり、その
ときはすべてのイテレータとポインタが無効になる。対照的に、
std::list
、
std::forward_list
では、イテレータとポインタが無効になるのは、削除された要素についてのみだ。
std::list
、
std::forward_list ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.