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Re: operator== missing on std::__debug::map<>::iterator


On Mon, 10 Dec 2012, Jonathan Wakely wrote:

On 10 December 2012 16:39, Pedro Larroy wrote:
Hi Paolo

What do you mean by doesn't exists? It exists in release mode in
_Rb_tree_iterator class

      bool
      operator==(const _Self& __x) const
      { return _M_node == __x._M_node; }

But I think it doesn't exist in the debug map iterator class, as the
compiler error shows.

Shouldn't it be added to the debug map iterator class also so the code
compiles in both release and debug modes?

No. Your code make non-portable assumptions about the iterator type and the debug mode has done you a favour by highlighting that error. You should fix your code to only rely on the operations guaranteed to work by the standard.

The standard says that if a and b are iterators of the same type then
a == b is a valid expression, it does not say that a.operator==(b) is
a valid expression.

By the way, would the standard allow those iterators to be final? (not suggesting it, just asking, because it doesn't seem forbidden)


--
Marc Glisse


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