/usr/include/ql/methods/montecarlo/mctraits.hpp is in libquantlib0-dev 1.7.1-1.
This file is owned by root:root, with mode 0o644.
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/*
 Copyright (C) 2000, 2001, 2002, 2003 RiskMap srl
 Copyright (C) 2003, 2004, 2005 StatPro Italia srl
 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/
 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at
 <http://quantlib.org/license.shtml>.
 This program 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 license for more details.
*/
/*! \file mctraits.hpp
    \brief Monte Carlo policies
*/
#ifndef quantlib_mc_traits_hpp
#define quantlib_mc_traits_hpp
#include <ql/methods/montecarlo/pathgenerator.hpp>
#include <ql/methods/montecarlo/multipathgenerator.hpp>
#include <ql/methods/montecarlo/pathpricer.hpp>
#include <ql/math/randomnumbers/rngtraits.hpp>
namespace QuantLib {
    // path generation and pricing traits
    //! default Monte Carlo traits for single-variate models
    template <class RNG = PseudoRandom>
    struct SingleVariate {
        typedef RNG rng_traits;
        typedef Path path_type;
        typedef PathPricer<path_type> path_pricer_type;
        typedef typename RNG::rsg_type rsg_type;
        typedef PathGenerator<rsg_type> path_generator_type;
        enum { allowsErrorEstimate = RNG::allowsErrorEstimate };
    };
    //! default Monte Carlo traits for multi-variate models
    template <class RNG = PseudoRandom>
    struct MultiVariate {
        typedef RNG rng_traits;
        typedef MultiPath path_type;
        typedef PathPricer<path_type> path_pricer_type;
        typedef typename RNG::rsg_type rsg_type;
        typedef MultiPathGenerator<rsg_type> path_generator_type;
        enum { allowsErrorEstimate = RNG::allowsErrorEstimate };
    };
}
#endif
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