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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182
11
章 宣言
extern int a; //
この
a
は上と同じ。外部リンケージを持つ
int b = 2; //
この
b
はリンケージを持たない。上で宣言された外部の
b
を隠蔽
extern int c; //
この
c
は上と同じ。内部リンケージを持つ
static int e; // e
はリンケージを持たない
/* ... */
}
この例からわかるように、外部か内部リンケージを持つ識別子は必ずしも常に可視とは
限らない。関数
func2()
で宣言されたリンケージのない識別子
b
は関数ブロックの終わりま
で外部リンケージを持つ識別子
b
を隠蔽する（「1.6.2識別子スコープ」参照）。
11.6
オブジェクトの記憶域期間
プログラムの実行中、「生存期間」と呼ばれるある期間、オブジェクトがメモリ位置に存
在する。生存期間の前後にはオブジェクトにアクセスする方法はない。
例えば、ポインタ
の値は指しているオブジェクトが生存期間を終えたら不当となる。
Cではオブジェクトの生存期間は記憶域期間で決まる。Cのオブジェクトは静的、スレッ
ド、自動、割り当ての4つのいずれかの記憶域期間を持つ。C標準は使用するシステムアー
キテクチャでオブジェクトがどのように物理的に格納されるか規定しないが、普通は、静
的またはスレッド記憶域期間を持つオブジェクトはプログラムのデータセグメントに、自動
記憶域期間を持つオブジェクトはスタックに置かれる。割り当てられた記憶域は実行時に
プログラムが
malloc()
,
calloc()
, ...
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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.