how to do this meta-programming? print the address of random element's address of a variable length of arrays?

[Paul Backus]

On Sunday, 13 September 2020 at 07:00:36 UTC, mw wrote:
>
> Here it is: D wrapper for https://ta-lib.org/
>
> https://github.com/mingwugmail/talibd
>
> I end up using C macro to generate D functions, the single 
> template is this one:
>
> https://github.com/mingwugmail/talibd/blob/master/source/talibd.h#L117
> #define DECL_TA_FUNC(TA_FUNC, FUNC_INS, FUNC_OUTS, 
> expected_lookback) __NL__\

The most straightforward way to do this in D is with a mixin 
template. Something like:

mixin template DECL_TA_FUNC(string TA_FUNC, FUNC_INS, FUNC_OUTS, 
int expected_lookback)
{
     bool impl(...)
     {
         // ...
     }

     // Could also wrap the whole function in a string mixin,
     // but this is easier.
     mixin("alias ", TA_FUNC, " = impl;");
}

Which you would then use like this:

mixin DECL_TA_FUNC!(
     "TA_MA",
     Tuple!(int, "MA_optInTimePeriod", TA_MAType, "opInMAType"),
     Tuple!(double[], "outMA"),
     MA_optInTimePeriod - 1
);