define STRICT_R_HEADERS, include float.h, adjust dbl eps constant

[eddelbuettel]

Hi Jeffrey, Hi circumplex team,

Your CRAN package circumplex uses Rcpp, and is affected if we add a definition of STRICT_R_HEADERS as we would like to do. Please see the discussion at
RcppCore/Rcpp#1158
and the links therein for more context on this.

Here, I prefixed one #include <Rcpp.h> with STRICT_R_HEADERS. One additional change that is needed is the #include <float.h> (the compiler may suggst the C++ header #include , that is equivalent). We now can use DBL_EPSILON in two places.

It would be lovely if you could apply this. There is no strong urgency: we aim to get this done over all affected packages in the space of a few months. If you apply it, would you mind dropping me a note by email or swinging by
RcppCore/Rcpp#1158
to confirm?

Many thanks for your help, and I hope you continue to find Rcpp helpful. Please don't hesitate to ask if you have any questions.

[jmgirard]

Appreciate the pull request and not just an email - made it very easy on me.

[eddelbuettel]

Thanks for the very swift action, and kind note. I tend to agree -- it is also 'more precise' that copying patches from email. It helps to have URL in DESCRIPTION pointing to the a public repo.