Re: [boost] Variant and visitation (was: [optional] Safe optional)

On 18 Nov 2014, at 22:59, Antony Polukhin wrote:

2014-11-19 0:40 GMT+03:00 Nevin Liber :

...

It's the inversion of control that people just don't like.

As a guy, who's been keeping an eye on Boost.Variant for last two years, I was planning to add support for generalized lambdas as a visitors for variant:

apply_visitor( [](auto v){ std::cout << v; }, variant_variable );

Alternatively, it could be done like this: apply_visitor(variant_variable, [](int i) { std::cout << “int: “ << i; }, [](float f) { std::cout << “float: “ << f; }, otherwise([](auto v) { std::cout << “something: “ << v; }); I’ve recently written something very similar for boost::any, using runtime checks instead of course. Sebastian