Each function instantiated from the template described in this section [rand.util.canonical] maps the result of one or more invocations of a supplied uniform random bit generator g to one member of the specified RealType such that, if the values produced by g are uniformly distributed, the instantiation's results , , are distributed as uniformly as possible as specified below.
[ Note: Obtaining a value in this way can be a useful step in the process of transforming a value generated by a uniform random bit generator into a value that can be delivered by a random number distribution. — end note ]
template<class RealType, size_t bits, class URBG>
RealType generate_canonical(URBG& g);
Effects: Invokes g() k times to obtain values , respectively. Calculates a quantity
using arithmetic of type RealType.
b is introduced to avoid any attempt to produce more bits of randomness than can be held in RealType.