September 2015
Intermediate to advanced
364 pages
10h 33m
Japanese
Content preview from Effective Modern C++ ―C++11/14プログラムを進化させる42項目
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
92
｜
3 章 現代の C++ への移行
数も含め）、例外を発生させうると明示された場合です（すなわち「noexcept(false)」と宣言され
ている場合）。このようなデストラクタは滅多にありません。標準ライブラリには 1 つもありません
し、もし標準ライブラリが使用するオブジェクトのデストラクタが例外を発生させると（コンテナ
内に存在する、アルゴリズムに渡されたなど）、プログラムの動作は未定義となります。
関数インタフェースはコード利用者と開発者間の一種の契約と言えますが、ライブラリインタ
フェース設計者が、範囲が広い契約（wide contract）の関数と、範囲が狭い契約（narrow contract）
の関数を区別する点は注目に値します。範囲が広い契約の関数とは事前条件を何も設けない関数で
す。この種の関数はプログラムの状態とは無関係に呼び出される可能性があり、また、渡される実
引数にも何ら制約を課しません8。範囲が広い契約の関数が未定義動作を示すことはありません。
範囲が広い契約ではない関数は範囲が狭い契約という性質になり、この種の関数では、事前条件
を満たしていない場合に結果が未定義になります。
範囲が広い契約の関数を開発し、例外を発生させないことが分かっていれば、本項目に従い
noexcept と容易に宣言できます。範囲が狭い契約の関数では、状況はやや込み入って来ます。仮引
数に std::string をとる関数 f を開発するとしましょう。また、f 本来の実装では例外を発生させ
ることがないとします。この場合は、 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.