[Patch] libstdc++/21172

[Doug Gregor]

On Feb 11, 2007, at 12:57 PM, Paolo Carlini wrote:
> @@ -427,7 +431,7 @@
>        __glibcxx_function_requires(_LessThanComparableConcept<
>  	    typename iterator_traits<_RandomAccessIterator>::value_type>)
>        __glibcxx_requires_valid_range(__first, __last);
> -      //      __glibcxx_requires_heap(__first, __last);
> +      __glibcxx_requires_heap(__first, __last);
>
>        while (__last - __first > 1)
>  	std::pop_heap(__first, _RandomAccessIterator(__last--));

I can't imagine why that __glibcxx_requires_heap was commented-out.  
This patch looks good to me.

   Cheers,
   Doug