Arity of a generic lambda

Question

It is possible to deduce arity of a non-generic lambda by accessing its operator().

template 
struct fInfo : fInfo

        

Answer 1

Another posible solution, for case when possible template types are known: http://coliru.stacked-crooked.com/a/e3a07d723a8f27e9

using T1 = string;
using T2 = int;

std::integral_constant static arity(function){ return {}; }
std::integral_constant static arity(function){ return {}; }

template
using Arity = decltype(arity(Fn{}));