convert to thread safe data types

[TommyJones]

No description provided.

[codecov]

Codecov Report

Merging #5 into main will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #5   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files           2        2           
  Lines         116      116           
=======================================
  Hits          114      114           
  Misses          2        2           

Impacted Files	Coverage Δ
src/calc_sum_squares_latent.cpp	100.00% <100.00%> (ø)

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