Sun Studio 12: C++ User's Guide
    
U
 
 -U, compiler option ( Index Term Link ) ( Index Term Link )
 
 ulimit, command ( Index Term Link )
 
 unexpected() function ( Index Term Link )
 
 union declaration specifier ( Index Term Link )
 
 __unix, predefined macro ( Index Term Link )
 
 unix, predefined macro ( Index Term Link )
 
 UNIX tools ( Index Term Link )
 
 -unroll=n, compiler option ( Index Term Link )
 
 user-defined types
  iostream ( Index Term Link )
  MT-safe ( Index Term Link )