Re: std::tr1::unordered_set problem in GCC 4.1.2

Pete Becker <>
Sun, 8 Apr 2007 15:32:13 CST
Howard Hinnant wrote:

Your class actually looks like:

class Traxboard {
      bool operator==(const Traxboard& another) const;
      bool operator&();
      int getHash() const;

The gcc code is taking the address of a Traxboard and you're returning a
bool. gcc wants a Traxboard* when it says &(some expression yielding an
lvalue Traxboard).

Which is, nevertheless, a gcc bug, since the key type for an unordered
container is allowed to overloaed operator&. Of course, that's not a
good idea, and should probably not be allowed. It wreaks havoc unless
library code that needs an address carefully works around it.


    -- Pete
Roundhouse Consulting, Ltd. (
Author of "The Standard C++ Library Extensions: a Tutorial and
Reference." (

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