C++ lambda with captures as a function pointer

Question

I was playing with C++ lambdas and their implicit conversion to function pointers. My starting example was using them as callback for the ftw function. This works as expecte

Answer 1

Found an answer here: http://meh.schizofreni.co/programming/magic/2013/01/23/function-pointer-from-lambda.html

It converts lambda pointer to void* and convert back when needed.

1. to void*:

   auto voidfunction = new decltype(to_function(lambda))(to_function(lambda));

2. from void*:

   auto function = static_cast< std::function*>( voidfunction);