/*
 **************************************************************
 *         C++ Mathematical Expression Toolkit Library        *
 *                                                            *
 * Simple Example 19                                          *
 * Author: Arash Partow (1999-2025)                           *
 * URL: https://www.partow.net/programming/exprtk/index.html  *
 *                                                            *
 * Copyright notice:                                          *
 * Free use of the Mathematical Expression Toolkit Library is *
 * permitted under the guidelines and in accordance with the  *
 * most current version of the MIT License.                   *
 * https://www.opensource.org/licenses/MIT                    *
 * SPDX-License-Identifier: MIT                               *
 *                                                            *
 **************************************************************
*/


#include 
#include 
#include 
#include 

#include "exprtk.hpp"


template 
class randu : public exprtk::igeneric_function
{
public:

   typedef typename exprtk::igeneric_function igfun_t;
   typedef typename igfun_t::parameter_list_t    parameter_list_t;
   typedef typename igfun_t::generic_type        generic_type;
   typedef typename generic_type::vector_view    vector_t;

   using exprtk::igeneric_function::operator();

   randu()
   : exprtk::igeneric_function("V|VTT")
     /*
        Overloads:
        0. V   - vector
        1. VTT - vector, r0, r1
     */
   { ::srand(static_cast(time(NULL))); }

   inline T operator()(const std::size_t& ps_index, parameter_list_t parameters)
   {
      vector_t v(parameters[0]);

      std::size_t r0 = 0;
      std::size_t r1 = v.size() - 1;

      using namespace exprtk::rtl::vecops::helper;

      if (
           (1 == ps_index) &&
           !load_vector_range::process(parameters, r0, r1, 1, 2, 0)
         )
         return T(0);

      for (std::size_t i = r0; i