Is 1.0 a valid output from std::generate_canonical?

Question

I always thought random numbers would lie between zero and one, without 1, i.e. they are numbers from the half-open interval [0,1). The documen

Answer 1

According to the standard, 1.0 is not valid.

C++11 §26.5.7.2 Function template generate_canonical

Each function instantiated from the template described in this section 26.5.7.2 maps the result of one or more invocations of a supplied uniform random number generator g to one member of the specified RealType such that, if the values g_i produced by g are uniformly distributed, the instantiation’s results t_j , 0 ≤ t_j < 1, are distributed as uniformly as possible as specified below.