/usr/include/claw/real_number.hpp is in libclaw-dev 1.7.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file claw/real_number.hpp
* \brief Custom precision real numbers.
* \author Julien Jorge
*/
#ifndef __CLAW_REAL_NUMBER_HPP__
#define __CLAW_REAL_NUMBER_HPP__
#include <iostream>
#include <limits>
namespace claw
{
template<typename T>
class real_number;
}
template<typename T>
std::istream& operator>>( std::istream& is, claw::real_number<T>& self );
namespace claw
{
/**
* \brief This class generates an epsilon value of a given precision.
* \author Julien Jorge
*/
template<typename T>
struct make_epsilon
{
static T value( T v )
{
return std::abs(v) <= 1 ?
std::numeric_limits<T>::epsilon() :
std::abs(v) * std::numeric_limits<T>::epsilon();
}
}; // struct make_epsilon
/**
* \brief Custom precision real numbers.
* \author Julien Jorge
*/
template<typename T>
class real_number
{
friend
std::istream& ::operator>> <>( std::istream& is, real_number<T>& self );
public:
typedef T value_type;
typedef real_number<T> self_type;
public:
real_number();
real_number( const value_type& v );
real_number( const self_type& that );
self_type abs() const;
bool operator<( const self_type& that ) const;
bool operator<=( const self_type& that ) const;
bool operator>( const self_type& that ) const;
bool operator>=( const self_type& that ) const;
bool operator==( const self_type& that ) const;
bool operator!=( const self_type& that ) const;
self_type operator+( const self_type& that ) const;
self_type operator-( const self_type& that ) const;
self_type operator*( const self_type& that ) const;
self_type operator/( const self_type& that ) const;
self_type& operator+=( const self_type& that );
self_type& operator-=( const self_type& that );
self_type& operator*=( const self_type& that );
self_type& operator/=( const self_type& that );
std::ostream& output( std::ostream& os ) const;
template<typename U>
operator U() const;
private:
/** \brief The value of the number. */
value_type m_value;
/** \brief Precision applied to operators. */
value_type m_epsilon;
}; // class real_number
} // namespace claw
namespace std
{
template<typename T>
struct numeric_limits< claw::real_number<T> >:
public numeric_limits<T>
{
}; // struct numeric_limits
template<typename T>
claw::real_number<T> abs( const claw::real_number<T>& v );
} // namespace std
// unary minus
template<typename T>
claw::real_number<T> operator-( const claw::real_number<T>& self );
template<typename T>
claw::real_number<T> operator-( T v, const claw::real_number<T>& self );
template<typename T>
std::ostream& operator<<( std::ostream& os, const claw::real_number<T>& self );
template<typename T>
std::istream& operator>>( std::istream& is, claw::real_number<T>& self );
#include "claw/impl/real_number.tpp"
#endif // __CLAW_REAL_NUMBER_HPP__
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