BLAS stands for
Basic Linear Algebra Subprograms.
C++ programs may instantiate this class.
See, for example,
Dongarra, Du Croz, Duff, and Hammerling:
A set of Level 3 Basic Linear Algebra Subprograms;
Technical Report MCS-P1-0888,
Argonne National Laboratory (USA),
Mathematics and Computer Science Division,
August, 1988.