.\" Copyright (c) 2003 Hiten M. Pandya
.\"
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.\" %FreeBSD: src/share/man/man9/CTASSERT.9,v 1.2 2003/05/30 21:13:32 ru Exp %
.\"
.\" $FreeBSD$
.Dd May 15, 2003
.Os
.Dt CTASSERT 9
.Sh 名称
.Nm CTASSERT
.Nd コンパイル時のアサーションマクロ
.Sh 書式
.In sys/param.h
.In sys/systm.h
.Fn CTASSERT expression
.Sh 解説
.Fn CTASSERT
マクロは
.Fa expression
をコンパイル時に評価し、それが偽の場合にはコンパイラエラーを発生させます。
.Pp
.Fn CTASSERT
マクロは重要なデータ構造体または変数のサイズまたはアライメントを
コンパイル時にアサートするのに便利です。
これは実行時にコードを失敗させる事とは異なります。
.Sh 使用例
.Vt uuid
構造体の大きさが 16 バイトであることをアサートします。
.Pp
.Dl "CTASSERT(sizeof(struct uuid) == 16);"
.Sh 関連項目
.Xr KASSERT 9
.Sh 作者
このマニュアルページは
.An Hiten M. Pandya
.Aq hmp@FreeBSD.org
が書きました。