November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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9.3
ポインタと型修飾子
143
9.3
ポインタと型修飾子
ポインタ宣言は型修飾子
const
,
volatile
かつ /または
restrict
を複数含む場合もある。
const
および
volatile
はポインタ型そのものまたは指しているオブジェクト型を修飾する。
この相違は重要だ。ポインタ宣言子での型修飾子、つまりアスタリスクとポインタ名との間
にある型修飾子は、ポインタそのものを修飾する。例を挙げる。
short const volatile* restrict ptr;
キーワード
restrict
は、この宣言でポインタ
ptr
を修飾する。このポインタは、
const
ま
たは
volatile
または両方で修飾されうる型
short
のオブジェクトを参照できる（
restrict
については「9.3.2restrict修飾ポインタ」参照）。
型が
const
で修飾されたオブジェクトは定数だ。定義後プログラムで変更できない。型
修飾子
volatile
はコンパイラにオブジェクトが現在のプログラムだけでなく他のプロセス
やイベントで変更される可能性を示唆する（11章を参照）。
ポインタ宣言で最もよく使われる修飾子は、関数引数の定数オブジェクト
へのポインタだ。そのため、次の記述で型修飾子
const
を扱うが、同じ規
則がポインタの
volatile
型修飾子使用にも当てはまる。
9.3.1
定数ポインタと定数オブジェクトへのポインタ
定数ポインタの定義では、後で変更できないので初期化しなければならない。次の例に
示すように定数ポ
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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.