/usr/include/ql/utilities/null.hpp is in libquantlib0-dev 1.4-2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
Copyright (C) 2000, 2001, 2002, 2003 RiskMap srl
Copyright (C) 2003, 2004 StatPro Italia srl
Copyright (C) 2010 Kakhkhor Abdijalilov
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 null.hpp
\brief null values
*/
#ifndef quantlib_null_hpp
#define quantlib_null_hpp
#include <ql/types.hpp>
#include <boost/type_traits.hpp>
namespace QuantLib {
//! template class providing a null value for a given type.
template <class Type>
class Null;
namespace detail {
template <bool>
struct FloatingPointNull;
// null value for floating-point types
template <>
struct FloatingPointNull<true> {
static float nullValue() {
return QL_NULL_REAL;
}
};
// null value for integer types
template <>
struct FloatingPointNull<false> {
static int nullValue() {
return QL_NULL_INTEGER;
}
};
}
// default implementation for built-in types
template <typename T>
class Null {
public:
Null() {}
operator T() const {
return T(detail::FloatingPointNull<
boost::is_floating_point<T>::value>::nullValue());
}
};
}
#endif
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