netbsd man page for typeof

TYPEOF(3)						   BSD Library Functions Manual 						 TYPEOF(3)

NAME
     typeof -- GNU extension for type of an expression

SYNOPSIS
     type
     typeof(expression);

DESCRIPTION
     The typeof() construct can be used to obtain the type of an expression.  The syntax is comparable to that of sizeof(), but semantically
     typeof() operates like a type name defined with typedef.

EXAMPLES
     The following is a typical example of a type-generic macro:

	   #define MAX(a, b) ({ 	   
		   typeof(a) _a = (a);	   
		   typeof(b) _b = (b);	   
		   _a > _b ? _a : _b;	   
	   })

SEE ALSO
     gcc(1), __alignof__(3), attribute(3), offsetof(3)

CAVEATS
     The typeof() construct is a non-standard, compiler-specific extension.

BSD
								 December 19, 2010							       BSD