<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Nov 15, 2008, at 8:27 PM, Zhongxing Xu wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><br><div class="gmail_quote">On Sun, Nov 16, 2008 at 11:28 AM, Ted Kremenek <span dir="ltr"><<a href="mailto:kremenek@apple.com">kremenek@apple.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d"><br> On Nov 15, 2008, at 5:55 AM, Zhongxing Xu wrote:<br> <br> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <br> One side problem is that I cannot make the MemRegion* in the ImmutableList const. If I did that, I would get compile error, related to FoldingSet Profile() overloading.<br> <br> It seems that ImmutableList cannot take a const type as template parameter, otherwise the two Profile functions in the partial specialization of FoldingSetTrait would have the same signature. (FoldingSet.h:444, 447).<br> </blockquote> <br></div> Could we provide a partial specialization of FoldingSetTrait just for ImmutableList? Or, does (something like) this work (i.e., add another partial specialization for const types):<br> <br> template<typename const T> struct FoldingSetTrait<const T*> {<br> static inline void Profile(const T* X, FoldingSetNodeID& ID) {<br> ID.AddPointer(X);<br> }<br> };<br> </blockquote></div><br>Yeah, this works! Thanks. Incidentally, do you think the old problem is caused by a g++ bug, because, at FoldingSet.h:234, the parameter for Add() already contains 'const', T should not contain 'const' when being instantiated.<br></blockquote></div><br><div>On 234 we have:</div><div><br></div><div><div> template <typename T></div> <div> inline void Add(const T& x) { FoldingSetTrait<T>::Profile(x, *this); }</div><div><br></div><div>maybe we just add partial specialization:</div><div><br></div><div><div> template <typename const T></div> <div> inline void Add(const T& x) { FoldingSetTrait<T>::Profile(x, *this); }</div></div></div></body></html>