Reduce -Wconversion warnings

[krlmlr]

by using size_t instead of int for local variables.

3/n, I'm afraid the PRs after this will be more challenging to review...

[codecov-io]

Codecov Report

Merging #691 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #691   +/-   ##
=======================================
  Coverage   89.77%   89.77%           
=======================================
  Files          66       66           
  Lines        3511     3511           
=======================================
  Hits         3152     3152           
  Misses        359      359

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[eddelbuettel]

Looks good to me.

But then I am on coffee #1 for the day...

[eddelbuettel]

I'm afraid the PRs after this will be more challenging to review...

Maybe let's discuss them more here on issues or on the list? Or we keep'em in branches and don't immediately PR? Other ideas?

[krlmlr]

I could do a "for-discussion" PR in my own repo to reduce clutter here.

[kevinushey]

LGTM

[eddelbuettel]

@kevinushey @krlmlr when you have a moment, can you check package hBayesDM? Something have changed there in its dependencies, but for Rcpp 0.12.10 (as on CRAN) and our master, my builds (simple R CMD INSTALL) goes crazy and completely hogs my (big-ish) machine at work. I killed the tests by the time the load gets to 30 ...

I don't think it is us. I may just skip the package going forward.

[kevinushey]

This is presumedly with the CRAN version of hBayesDM? I'll see if I can reproduce...

[kevinushey]

I see the same thing on macOS -- clang is just sitting there chomping up CPU and gobbling up more and more memory (at 2.5GB now).

I suspect that whatever the issue is, it's independent of Rcpp.