/usr/include/GeographicLib/Constants.hpp is in libgeographiclib-dev 1.21-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file Constants.hpp
* \brief Header for GeographicLib::Constants class
*
* Copyright (c) Charles Karney (2008-2011) <charles@karney.com> and licensed
* under the MIT/X11 License. For more information, see
* http://geographiclib.sourceforge.net/
**********************************************************************/
#if !defined(GEOGRAPHICLIB_CONSTANTS_HPP)
#define GEOGRAPHICLIB_CONSTANTS_HPP \
"$Id: 895e4bd91979aae347436bbf6be37964f05f5b6f $"
#include <GeographicLib/Config.h>
/**
* A compile-time assert. Use C++11 static_assert, if available.
**********************************************************************/
#if !defined(STATIC_ASSERT)
# if defined(__GXX_EXPERIMENTAL_CXX0X__)
# define STATIC_ASSERT static_assert
# elif defined(_MSC_VER) && _MSC_VER >= 1600
# define STATIC_ASSERT static_assert
# else
# define STATIC_ASSERT(cond,reason) \
{ enum{ STATIC_ASSERT_ENUM = 1/int(cond) }; }
# endif
#endif
#if defined(__GNUC__)
// Suppress "defined but not used" warnings
# define RCSID_DECL(x) namespace \
{ char VAR_ ## x [] __attribute__((used)) = x; }
#else
/**
* Insertion of RCS Id strings into the object file.
**********************************************************************/
# define RCSID_DECL(x) namespace { char VAR_ ## x [] = x; }
#endif
#if defined(_WIN32) && defined(GEOGRAPHIC_SHARED_LIB)
# if defined(Geographic_EXPORTS)
# define GEOGRAPHIC_EXPORT __declspec(dllexport)
# else
# define GEOGRAPHIC_EXPORT __declspec(dllimport)
# endif
#else
# define GEOGRAPHIC_EXPORT
#endif
#include <stdexcept>
#include <GeographicLib/Math.hpp>
/**
* \brief Namespace for %GeographicLib
*
* All of %GeographicLib is defined within the GeographicLib namespace. In
* addition all the header files are included via %GeographicLib/filename.
* This minimizes the likelihood of conflicts with other packages.
**********************************************************************/
namespace GeographicLib {
/**
* \brief %Constants needed by %GeographicLib
*
* Define constants specifying the WGS84 ellipsoid, the UTM and UPS
* projections, and various unit conversions.
*
* Example of use:
* \include example-Constants.cpp
**********************************************************************/
class GEOGRAPHIC_EXPORT Constants {
private:
typedef Math::real real;
Constants(); // Disable constructor
public:
/**
* A synonym for Math::degree<real>().
**********************************************************************/
static inline Math::real degree() throw() { return Math::degree<real>(); }
/**
* @return the number of radians in an arcminute.
**********************************************************************/
static inline Math::real arcminute() throw()
{ return Math::degree<real>() / 60; }
/**
* @return the number of radians in an arcsecond.
**********************************************************************/
static inline Math::real arcsecond() throw()
{ return Math::degree<real>() / 3600; }
/** \name Ellipsoid parameters
**********************************************************************/
///@{
/**
* @tparam T the type of the returned value.
* @return the equatorial radius of WGS84 ellipsoid (6378137 m).
**********************************************************************/
template<typename T> static inline T WGS84_a() throw()
{ return T(6378137) * meter<T>(); }
/**
* A synonym for WGS84_a<real>().
**********************************************************************/
static inline Math::real WGS84_a() throw() { return WGS84_a<real>(); }
/**
* @tparam T the type of the returned value.
* @return the flattening of WGS84 ellipsoid (1/298.257223563).
**********************************************************************/
template<typename T> static inline T WGS84_f() throw()
{ return T(1) / ( T(298) + T(257223563) / T(1000000000) ); }
/**
* A synonym for WGS84_f<real>().
**********************************************************************/
static inline Math::real WGS84_f() throw() { return WGS84_f<real>(); }
/**
* @tparam T the type of the returned value.
* @return the gravitational constant of the WGS84 ellipsoid, \e GM, in
* m<sup>3</sup> s<sup>-2</sup>.
**********************************************************************/
template<typename T> static inline T WGS84_GM() throw()
{ return T(3986004) * T(100000000) + T(41800000); }
/**
* @tparam T the type of the returned value.
* @return the angular velocity of the the WGS84 ellipsoid, \e omega, in
* rad s<sup>-1</sup>.
**********************************************************************/
template<typename T> static inline T WGS84_omega() throw()
{ return T(7292115) / (T(1000000) * T(100000)); }
/// \cond SKIP
/**
* <b>DEPRECATED</b>
* @return the reciprocal flattening of WGS84 ellipsoid.
**********************************************************************/
template<typename T> static inline T WGS84_r() throw()
{ return 1/WGS84_f<T>(); }
/**
* <b>DEPRECATED</b>
* A synonym for WGS84_r<real>().
**********************************************************************/
/// \endcond
static inline Math::real WGS84_r() throw() { return WGS84_r<real>(); }
/**
* @tparam T the type of the returned value.
* @return the equatorial radius of GRS80 ellipsoid, \e a, in m.
**********************************************************************/
template<typename T> static inline T GRS80_a() throw()
{ return T(6378137); }
/**
* @tparam T the type of the returned value.
* @return the gravitational constant of the GRS80 ellipsoid, \e GM, in
* m<sup>3</sup> s<sup>-2</sup>.
**********************************************************************/
template<typename T> static inline T GRS80_GM() throw()
{ return T(3986005) * T(100000000); }
/**
* @tparam T the type of the returned value.
* @return the angular velocity of the the GRS80 ellipsoid, \e omega, in
* rad s<sup>-1</sup>.
*
* This is about 2*pi*366.25 / (365.25*24*3600) rad s<sup>-1</sup>. 365.25
* is the number of days in a Julian year and 365.35/366.25 converts from
* solar days to sidereal days. Using the number of days in a Gregorian
* year (365.2425) results in a worse approximation (because the Gregorian
* year includes the precession of the earth's axis).
**********************************************************************/
template<typename T> static inline T GRS80_omega() throw()
{ return T(7292115) / (T(1000000) * T(100000)); }
/**
* @tparam T the type of the returned value.
* @return the dynamical form factor of the GRS80 ellipsoid,
* <i>J</i><sub>2</sub>.
**********************************************************************/
template<typename T> static inline T GRS80_J2() throw()
{ return T(108263) / T(100000000); }
/**
* @tparam T the type of the returned value.
* @return the central scale factor for UTM (0.9996).
**********************************************************************/
template<typename T> static inline T UTM_k0() throw()
{return T(9996) / T(10000); }
/**
* A synonym for UTM_k0<real>().
**********************************************************************/
static inline Math::real UTM_k0() throw() { return UTM_k0<real>(); }
/**
* @tparam T the type of the returned value.
* @return the central scale factor for UPS (0.994).
**********************************************************************/
template<typename T> static inline T UPS_k0() throw()
{ return T(994) / T(1000); }
/**
* A synonym for UPS_k0<real>().
**********************************************************************/
static inline Math::real UPS_k0() throw() { return UPS_k0<real>(); }
///@}
/** \name SI units
**********************************************************************/
///@{
/**
* @tparam T the type of the returned value.
* @return the number of meters in a meter.
*
* This is unity, but this lets the internal system of units be changed if
* necessary.
**********************************************************************/
template<typename T> static inline T meter() throw() { return T(1); }
/**
* A synonym for meter<real>().
**********************************************************************/
static inline Math::real meter() throw() { return meter<real>(); }
/**
* @return the number of meters in a kilometer.
**********************************************************************/
static inline Math::real kilometer() throw()
{ return 1000 * meter<real>(); }
/**
* @return the number of meters in a nautical mile (approximately 1 arc
* minute)
**********************************************************************/
static inline Math::real nauticalmile() throw()
{ return 1852 * meter<real>(); }
/**
* @tparam T the type of the returned value.
* @return the number of square meters in a square meter.
*
* This is unity, but this lets the internal system of units be changed if
* necessary.
**********************************************************************/
template<typename T> static inline T square_meter() throw()
{ return meter<real>() * meter<real>(); }
/**
* A synonym for square_meter<real>().
**********************************************************************/
static inline Math::real square_meter() throw()
{ return square_meter<real>(); }
/**
* @return the number of square meters in a hectare.
**********************************************************************/
static inline Math::real hectare() throw()
{ return 10000 * square_meter<real>(); }
/**
* @return the number of square meters in a square kilometer.
**********************************************************************/
static inline Math::real square_kilometer() throw()
{ return kilometer() * kilometer(); }
/**
* @return the number of square meters in a square nautical mile.
**********************************************************************/
static inline Math::real square_nauticalmile() throw()
{ return nauticalmile() * nauticalmile(); }
///@}
/** \name Anachronistic British units
**********************************************************************/
///@{
/**
* @return the number of meters in an international foot.
**********************************************************************/
static inline Math::real foot() throw()
{ return real(0.0254L) * 12 * meter<real>(); }
/**
* @return the number of meters in a yard.
**********************************************************************/
static inline Math::real yard() throw() { return 3 * foot(); }
/**
* @return the number of meters in a fathom.
**********************************************************************/
static inline Math::real fathom() throw() { return 2 * yard(); }
/**
* @return the number of meters in a chain.
**********************************************************************/
static inline Math::real chain() throw() { return 22 * yard(); }
/**
* @return the number of meters in a furlong.
**********************************************************************/
static inline Math::real furlong() throw() { return 10 * chain(); }
/**
* @return the number of meters in a statute mile.
**********************************************************************/
static inline Math::real mile() throw() { return 8 * furlong(); }
/**
* @return the number of square meters in an acre.
**********************************************************************/
static inline Math::real acre() throw() { return chain() * furlong(); }
/**
* @return the number of square meters in a square statute mile.
**********************************************************************/
static inline Math::real square_mile() throw() { return mile() * mile(); }
///@}
/** \name Anachronistic US units
**********************************************************************/
///@{
/**
* @return the number of meters in a US survey foot.
**********************************************************************/
static inline Math::real surveyfoot() throw()
{ return real(1200) / real(3937) * meter<real>(); }
///@}
};
/**
* \brief Exception handling for %GeographicLib
*
* A class to handle exceptions. It's derived from std::runtime_error so it
* can be caught by the usual catch clauses.
*
* Example of use:
* \include example-GeographicErr.cpp
**********************************************************************/
class GeographicErr : public std::runtime_error {
public:
/**
* Constructor
*
* @param[in] msg a string message, which is accessible in the catch
* clause, via what().
**********************************************************************/
GeographicErr(const std::string& msg) : std::runtime_error(msg) {}
};
} // namespace GeographicLib
#endif // GEOGRAPHICLIB_CONSTANTS_HPP
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