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Showing content from https://cplusplus.com/reference/random/generate_canonical/ below:

function template

std::generate_canonical

template <class RealType, size_t bits, class URNG>  RealType generate_canonical (URNG& g);

Generate canonical numbers

Converts values generated by g into a floating-point value in the range [0,1) preserving the uniformity properties of sequences generated with g.

This may involve one or more calls to g.operator(), depending on the precision (template parameter bits) requested.

Template parameters

RealType: A floating-point type.
The function returns a value of this type.
bits: Maximum number of bits in the mantissa (the precision).
If this value is greater than the precision of the type, numeric_limits<RealType>::digits is used instead.
URNG: A uniform random number generator class.

Parameters

g: A uniform random number generator object, whose operator() is used to generate the values.

Return value The canonical equivalent to numbers generated by g.

Example

// generate_canonical
#include <iostream>
#include <chrono>
#include <limits>
#include <random>

int main ()
{
 // obtain a seed from the system clock:
  unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();

  std::default_random_engine generator (seed);
  double d = std::generate_canonical<double,std::numeric_limits<double>::digits>(generator);

  std::cout << "Canonical random value: " << d << std::endl;

  return 0;
}

Output:

Canonical random value: 0.349775