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Aug 19, 2025
| * これイマイチどのレイヤーに属する概念なのかわからない。OS CPU? 言語? GCC だったらこれ、clang だったらこれとかが決まっている？ | ||
| * https://www.jpcert.or.jp/sc-rules/c-int00-c.html | ||
| * 言語の処理系の話なのかなたぶん | ||
| * 「ふつう」のデータモデルってどれなの？ C++ Standard? でも int は at least 16 bits らしい。 |
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int や long などの実際のサイズがいくらになるかは言語処理系の話ですね。
C, C++ は、衛星に組み込む小さなチップからスーパーコンピュータまでを想定している言語なので、処理系によって異なるサイズにしていいことになっています。とはいえ、最低の大きさや大小関係は保証されています。
int以外使うな
int は「その処理系にとって一番使いやすいサイズ」という意味なので「軽率に使ってよい」と思うのですが、「それを使いたくない理由はあるが、しかし、何ビットかを明示しない」という状況があるのか、という考え方は理解できますね。
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704. Binary Search
https://leetcode.com/problems/binary-search/