generate_canonical Function template in C++

This template in C++ is used to convert the value generated by g into a floating point value in the range [0, 1) preserving the uniformity properties of sequences generated with g. To generate enough entropy generate_canonical() will call g() exactly ‘k’ times where,

 k = max(1, \lceil \frac{b}{log_2 R} \rceil)

Syntax:

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

Template parameters: This template accepts three parameters as mentioned above and described below:

  • RealType: The function returns a value of floating point type.
  • bits: Maximum number of bits in the mantissa.
  • URNG: A uniform random number generator class.

Parameters: The generate_canonical() function accepts single parameter g which is used as uniform random number generator object. It is used to acquire entropy.

Return value: This function returns a floating point value in range [0, 1).



Below programs illustrate the above C++ template
Program:

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// C++ program to illustrate generate_canonical()
// function.
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    // Obtain a root from the system clock:
    unsigned root = chrono::system_clock::now().time_since_epoch().count();
  
    // Random number engine class
    // that generates pseudo-random numbers
    default_random_engine generator(root);
    double can_val = generate_canonical<double
                              numeric_limits<double>::digits>(generator);
  
    // Print the random canonical value
    // It will display different value everytime
    cout << "Random canonical value: " << can_val;
  
    return 0;
}

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Output:

Random canonical value: 0.0281975

Reference: http://www.cplusplus.com/reference/random/generate_canonical/



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