on Mon Oct 29 2012, Dave Abrahams <dave-AT-boostpro.com> wrote:
I've been playing around with variant a bit and decided to try to build a data structure for storing json. I came up with several different approaches but none are super-satisfying. I'd like some feedback. (If you need a refresher on what's in json, the front page of http://json.org tells all).
I got *some* answers to my questions by experimentation: https://gist.github.com/3976374 Output: size of objects: 48, 48, 48 size of arrays: 24, 24, 24 size of variants: 56, 16, 16 What I learned is that using either recursive_wrapper or recursive_variant_ *does* seem to introduce an indirection even if one isn't needed. I also learned that 8 bytes are used for a discriminant on my x64 system, which I'll grudgingly admit might be the best we can do. But only grudgingly. Comments on other questions in that message are still appreciated. -- Dave Abrahams BoostPro Computing Software Development Training http://www.boostpro.com Clang/LLVM/EDG Compilers C++ Boost