Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  */
       9             : 
      10             : #include <time.h>
      11             : 
      12             : #include <random>
      13             : 
      14             : #include <formula/random.hxx>
      15             : #include <rtl/instance.hxx>
      16             : 
      17             : namespace {
      18             : 
      19             : struct CalcFormulaRandomGenerator
      20             : {
      21             :     std::mt19937 aRng;
      22           0 :     CalcFormulaRandomGenerator()
      23           0 :     {
      24             :         // initialises the state of this RNG.
      25             :         // should only be called once.
      26           0 :         bool bRepeatable = (getenv("SC_RAND_REPEATABLE") != 0);
      27           0 :         aRng.seed(bRepeatable ? 42 : time(NULL));
      28           0 :     }
      29             : };
      30             : 
      31             : class theCalcFormulaRandomGenerator : public rtl::Static<CalcFormulaRandomGenerator, theCalcFormulaRandomGenerator> {};
      32             : 
      33             : }
      34             : 
      35             : namespace formula
      36             : {
      37             : 
      38             : namespace rng
      39             : {
      40             : 
      41           0 : double fRandom(double a, double b)
      42             : {
      43           0 :     std::uniform_real_distribution<double> dist(a, b);
      44           0 :     return dist(theCalcFormulaRandomGenerator::get().aRng);
      45             : }
      46             : 
      47           0 : sal_Int32 nRandom(sal_Int32 a, sal_Int32 b)
      48             : {
      49           0 :     std::uniform_int_distribution<sal_Int32> dist(a, b);
      50           0 :     return dist(theCalcFormulaRandomGenerator::get().aRng);
      51             : }
      52             : 
      53             : } // rng
      54             : } // formula
      55             : 
      56             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */