'C++boost syntax - meaning of <> [duplicate]

I was generating a random number with the boost library, namely:

   boost::random::random_device rng;
   boost::random::uniform_int_distribution<> index_dist(0, chars.size() - 1);

Now I understand that uniform_int_distribution is class, but what's the meaning of the empty <>? Is it a template?

c++boost


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