CheckedCast.hpp

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///////////////////////////////////////////////////////////////////////////////
//
// File CheckedCast.hpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
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// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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//
// Description: simple routines to check if the casting is narrowing
//
///////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_LIB_UTILITIES_CHECKEDCAST_H
#define NEKTAR_LIB_UTILITIES_CHECKEDCAST_H

#include <LibUtilities/LibUtilitiesDeclspec.h>
#include <LibUtilities/BasicUtils/ErrorUtil.hpp>
#include <limits>
#include <type_traits>

namespace Nektar
{
namespace LibUtilities
{
/// checked cast from float types only to int types
template
<
    class To, class Ti,
    class = typename std::enable_if
    <
        std::is_floating_point<typename std::remove_reference<Ti>::type>::value
        && std::is_integral <typename std::remove_reference<To>::type>::value
    >::type
>
inline LIB_UTILITIES_EXPORT To checked_cast(const Ti param)
{
    Ti min = std::numeric_limits<To>::min();
    Ti max = std::numeric_limits<To>::max();
    ASSERTL0(param >= min, "Casting would narrow (underflow).");
    ASSERTL0(param <= max, "Casting would narrow (overflow).");
    return static_cast<To>(param);
}

}
}

#endif