Can you explain in English rather than posting code

Sorry, I was confused. I think I wanted to simplify fun( ( kwd<1>::value = arg1, // parameter::keyword >& kwd<1>::value ... kwd<n>::value = argn // parameter::keyword& kwd<n>::value ) ) and I should have probably looked for something like this typedef parameter::parameters< required >, ..., required

spec;

fun( spec(arg1,...,argn) ) So now, how to I create spec automatically? template struct spec{ //First = 1, Last = n+1 in the example above typedef ... type; };

er wrote:

Upon reflexion, my problem boils down to finding a metafunction that maps an mpl sequence, such as

typedef mpl::vector input;

to the template class boost::parameter::parameters instantiated with the elements of that sequence, each wrapped with required:

typedef parameter::parameters< required<tag1>, ... require<tagn>

...

output;

The implementation of parameter::parameters uses a macro so unless I'm willing to/can generate input with macro it seems like a dead end. Correct?

Does mpl::unpack_args sound like a valid starting point?