> error: macro "BOOST_PP_TUPLE_ELEM_4_0" requires 4 arguments, but only 3
> given
>
> , which could correspond to the fact that I did not yet define this
> defaut value in my :
>
> ((Real,coeff_dech,"=kn(unload) / kn(load)"))
The argument can be empty (default value unspecified), but you still
have to put the comma there (c preprocessor uses commas to separate
arguments), like this:
((Real,coeff_dech,,"=kn(unload) / kn(load)"))
^^^^
HTH, Vaclav
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