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diff --git a/src/EvtGenBase/EvtMTRandomEngine.cpp b/src/EvtGenBase/EvtMTRandomEngine.cpp
index 6c176e2..f61426e 100644
--- a/src/EvtGenBase/EvtMTRandomEngine.cpp
+++ b/src/EvtGenBase/EvtMTRandomEngine.cpp
@@ -1,44 +1,47 @@
/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#include "EvtGenBase/EvtMTRandomEngine.hh"
#include "EvtGenBase/EvtReport.hh"
#include <iostream>
EvtMTRandomEngine::EvtMTRandomEngine( unsigned long int seed ) :
- m_engine{ seed }, m_distribution{ 0.0, 1.0 }, m_lastSeed{ seed }
+ // static_cast needed to avoid narrowing errors on macOS
+ m_engine{ static_cast<std::mt19937::result_type>( seed ) },
+ m_distribution{ 0.0, 1.0 },
+ m_lastSeed{ seed }
{
EvtGenReport( EVTGEN_INFO, "EvtMTRandomEngine" )
<< "Mersenne-Twister random number generator with seed = " << seed
<< std::endl;
}
double EvtMTRandomEngine::random()
{
return m_distribution( m_engine );
}
void EvtMTRandomEngine::setSeed( unsigned long int seed )
{
m_engine.seed( seed );
m_lastSeed = seed;
}

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