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.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)assert.3 8.1 (Berkeley) 6/9/93
.\" %FreeBSD: src/share/man/man3/assert.3,v 1.7.2.2 2000/12/29 10:17:59 ru Exp %
.\"
.\" $FreeBSD$
.Dd January 26, 1999
.Dt ASSERT 3
.Os
.Sh 名称
.Nm assert
.Nd 式検証マクロ
.Sh 書式
.Fd #include <assert.h>
.Fn assert expression
.Sh 解説
.Fn assert
マクロは、指定された
.Ar expression
を試験し、偽の場合は、呼び出し元プロセスは終了されます。
診断メッセージが
.Em stderr
に書き込まれ、関数
.Xr abort 3
が呼び出されてプログラムを効率的に終了します。
.Pp
.Ar expression
が真の場合、
.Fn assert
マクロは何もしません。
.Pp
.Fn assert
マクロはコンパイル時に
.Dv NDEBUG
をマクロとして定義することで除去できます
(例えば
.Xr cc 1
のオプション
.Fl D Ns Dv NDEBUG
を使います)。
.Sh 診断
.Ar expression
が偽の場合、次の診断メッセージが
.Em stderr
に書き込まれます。
.Bd -literal -offset indent
"assertion \e"%s\e" failed: file \e"%s\e", line %d\en", \e
"expression", __FILE__, __LINE__);
.Ed
.Sh 関連項目
.Xr abort 3
.Pp
.Sh 歴史
.Nm
マクロは
.At v6
で登場しました。
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