On Thu, Apr 29, 2010 at 6:53 PM, vicente.botet <vicente.botet@wanadoo.fr>wrote:
Hi, I'm wondering if a checked element access via at() is missing for Random Access ranges.
It doesn't exist yet. I can implement one for after release 1.43. I imagine a non-member function something like this: template<typename RandomAccessRange> typename boost::range_reference<RandomAccessRange>::type at(RandomAccessRange& rng, typename boost::range_difference<RandomAccessRange>::type index) { BOOST_RANGE_CONCEPT_ASSERT(( ... )); if (index < 0 || index >= boost::size(rng)) throw std::out_of_range( ... ); return *(boost::begin(rng) + index); } ... const version ... Is this the sort of thing you are suggesting? Or would you expect something else for the second argument type to promote to the appropriate unsigned type and circumvent the check for < 0? Best,
_____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/
I like the idea. I would be interested in feedback from others. I also invite a confirmation that my understanding of your request is correct. Regards, Neil Groves