Re: [Boost-users] switch_

I see Boost.Switch_ was provisionally accepted back inJan 2008. I see some doc here: http://dancinghacker.com/switch But I can't see it released in recent boost versions

I need to select a type to dynamic_cast to based on a runtime index, so I would have the type in a mpl::vector, and use the switch_ to pick up the right type? I have under 20 types.

in pseudo c++11:

void f(std::size_t i, const T* obj) {

typedef mpl::vector alltypes_t;

const auto* drvobj = dynamic_cast<...>(obj); /// what do I set as arg of dynamic_cast

}

If switch_ can help, where do I get the code for it?

Hi, You can simply use the 'std::map' like this: void f(std::size_t i, const void* obj) { static const std::map map = { {0 , [](const void *obj){ derived0 *p = dynamic_cast

(o); ...; }} ,{1 , [](const void *obj){ derived1 *p = dynamic_castsecond(obj); }

...

const auto* drvobj = dynamic_cast<...>(obj); /// what do I set as arg of dynamic_cast

In that case the boost::switch_ not help you.