.. _program_listing_file_lib_rng.cpp:

Program Listing for File rng.cpp
================================

|exhale_lsh| :ref:`Return to documentation for file <file_lib_rng.cpp>` (``lib/rng.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include "rng.hpp"
   
   RNG::RNG() {
       std::random_device rd;
       this->random_seed = rd();
       this->gen = std::mt19937(this->random_seed);
   }
   
   RNG *RNG::m_pInstance = NULL;
   int RNG::counter = 0;
   
   RNG *RNG::rng() {
     if (!m_pInstance)
       m_pInstance = new RNG;
   
     return m_pInstance;
   }
   
   void RNG::set_seed(int seed) {
     this->random_seed = seed;
     this->gen = std::mt19937(this->random_seed);
   }
   
   int RNG::get_seed() { return this->random_seed; }
   
   std::mt19937 RNG::get_RNG() { 
     // Track users
     add_ref();
   
     return this->gen;
   }
   
   void RNG::add_ref() {
     ++counter;
   }
   
   void RNG::release_ref() {
     --counter;
   }
   
   void RNG::release_instance() {
     release_ref();
   
     if (counter == 0 && m_pInstance != NULL) {
       delete m_pInstance;
       m_pInstance = NULL;
     }
   }