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+.\" $NetBSD: typeof.3,v 1.2 2010/12/19 08:10:09 jruoho Exp $
+.\"
+.\" Copyright (c) 2010 Jukka Ruohonen <jruohonen@iki.fi>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd December 19, 2010
+.Dt TYPEOF 3
+.Os
+.Sh NAME
+.Nm typeof
+.Nd GNU extension for type of an expression
+.Sh SYNOPSIS
+.Ft type
+.Fn typeof "expression"
+.Sh DESCRIPTION
+The
+.Fn typeof
+construct can be used to obtain the type of an expression.
+The syntax is comparable to that of
+.Fn sizeof ,
+but semantically
+.Fn typeof
+operates like a type name defined with
+.Em typedef .
+.Sh EXAMPLES
+The following is a typical example of a type-generic macro:
+.Bd -literal -offset indent
+#define MAX(a, b) ({		\\
+	typeof(a) _a = (a);	\\
+	typeof(b) _b = (b);	\\
+	_a > _b ? _a : _b;	\\
+})
+.Ed
+.Sh SEE ALSO
+.Xr gcc 1 ,
+.Xr __alignof__ 3 ,
+.Xr attribute 3 ,
+.Xr offsetof 3
+.Sh CAVEATS
+The
+.Fn typeof
+construct is a non-standard, compiler-specific extension.