John Torjo <john.lists@torjo.com> writes:
Dear boosters, In the "looping construct" thread, a while ago David Abrahams said that we should do a test, to compare all looping solutions.
I've made such a test. It tests against: - keeping internal functions in crange<> - virtual functions - BOOST_FOREACH comparing to using raw iterators.
Where can we see the results?
The tests are pretty heavy. I've tested on a Win2000 box/512 Mb of RAM/1.8Ghz Intel processor (laptop), VC7.1 with all optimizations on.
It seems that Dave, you were right about the virtual functions - the vtable can be cached.
I didn't suggest that it'd be chached, but that some compiler might notice that the actual derived type was fixed at compile-time and eliminate the function pointer indirection, and that this was a little more likely with the compiler's virtual tables than with some simulation that we happen to write. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com