I was disappointed to discover that I can't write
<div><br></div><div><font face="courier new, monospace">range | filtered( some_predicate ) | sliced( n, m ) | .....</font></div><div><br></div><div>because sliced requires a random access range, and filtered produces a forward range!</div>

<div><br></div><div>Piffle.</div><div><br></div><div>It seems such a useful and obvious use-case. Is this restriction really necessary?</div><div><br></div><div>Thx, Rob.</div><div><br></div><div><br></div><div><br></div>