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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330
17
章 関数の機能別まとめ
17.15
デバッグ
マクロ
assert()
の使用はプログラム開発の途中で論理的な誤りを見つける単純な方法
だ。このマクロはヘッダ assert.hで定義する。単純にスカラ引数が非ゼロ値かどうかを
テストする。引数の値が 0なら、
assert()
は引数式、関数、ファイル名、行番号をリスト
したエラーメッセージを出力し、
abort()
を呼び出してプログラムを終了する。次の例は、
assert()
呼び出しが
free()
に渡される引数の妥当性をチェックする。
#include <stdlib.h>
#include <assert.h>
char* buffers[64] = { NULL }; //
ポインタの配列
int i;
/* ...
メモリバッファ割り付け。作業する
... */
assert(i >= 0 && i < 64); //
添字範囲外
?
ass
ert(buffers[i] != NULL); //
ポインタは使われたか
?
free(buffers[i]);
存在しないバッファを解放せず、このコードはプログラム（
assert.c
でコンパイル）を次
のような診断出力を表示して強制終了する。
assert: assert.c:14: main: Assertion 'buffers[i] != ((void*)0)' failed.
Aborted
テスト終了後、すべての
assert()
呼び出しを assert.hの
#include
指令の前にマクロ
NDEBUG ...
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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.