Getting the parameters of a struct/class constructor

[Joseph Rushton Wakeling]

Hello all,

Is there a way to construct a tuple of the types that need to be passed to a 
struct or class's constructor?

I tried using ParameterTypeTuple either on the class or its constructor:

     ParameterTypeTuple!A

or

     ParameterTypeTuple!(A.this)

... but neither works: the former generates an error,

     Error: template instance ParameterTypeTuple!(A) ParameterTypeTuple!(A) does 
not match template declaration ParameterTypeTuple(func...) if (func.length == 1 
&& isCallable!(func))

while the latter generates,

     Error: identifier expected following '.', not 'this'

A (broken) bit of sample code is attached which illustrates what I'm trying to 
achieve.  Can anyone advise?

Thanks & best wishes,

      -- Joe
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