Small modification of the constructor in ranvec1.h

Small modification of the constructor in ranvec1.h

[AgnerF]

It is not efficient to make a thread-local static object. It is more efficient to construct the object in the thread function as explained in the manual (ranvec1_manual.pdf example 2.2).

Your BernoulliVecFloat function can have a reference to the ran object as a parameter, or BernoulliVecFloat could be member of a class that inherits from ran.

Your solution is OK if the performance is satisfactory. My design does not have initialization in the constructor because there are three different initialization methods, and it may be convenient for the programmer to calculate the seed after constructing the ran object.

I can add an extra constructor with a seed parameter in the next version.

Thank you very much for your reply and sorry for the long wait!
I followed your advice and changed my code as explained in the ranvec1 manual.
It works perfectly and the performance is very good but I must admit I don't notice a real increase in execution speed either compared to the thread_local static object. But if I should write some specific testing code between the two I probably will notice some difference in efficiency. It's certainly not slower either.

[AgnerF]

done