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null.hpp
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null.hpp
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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
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 <type_traits>
#include <limits>
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> {
constexpr static float nullValue() {
// a specific values that should fit into any Real
return (std::numeric_limits<float>::max)();
}
};
// null value for integer types
template <>
struct FloatingPointNull<false> {
constexpr static int nullValue() {
// a specific values that should fit into any Integer
return (std::numeric_limits<int>::max)();
}
};
}
// default implementation for built-in types
template <typename T>
class Null {
public:
constexpr Null() = default;
constexpr operator T() const {
return T(detail::FloatingPointNull<std::is_floating_point<T>::value>::nullValue());
}
};
}
#endif