common.h

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//
//
/*
    Copyright (C) 2000 PARAPET partners
    Copyright (C) 2000- 2010, Hammersmith Imanet Ltd
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0 AND License-ref-PARAPET-license
 
        See STIR/LICENSE.txt for details
*/
#ifndef __stir_common_H__
#define __stir_common_H__

#include "stir/config.h"
 
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <cassert>
#if __cplusplus >= 202002L
#  include <numbers>
#endif
 
//*************** namespace macros
#define START_NAMESPACE_STIR                                                                                                     \
  namespace stir                                                                                                                 \
  {
#define END_NAMESPACE_STIR }
#define USING_NAMESPACE_STIR using namespace stir;
 
//*************** define __OS_xxx__
 
#if !defined(__OS_WIN__) && !defined(__OS_MAC__) && !defined(__OS_VAX__) && !defined(__OS_UNIX__)
// if none of these macros is defined externally, we attempt to guess, defaulting to UNIX
 
#  ifdef __MSL__
// Metrowerks CodeWarrior
// first set its own macro
#    if macintosh && !defined(__dest_os)
#      define __dest_os __mac_os
#    endif
#    if __dest_os == __mac_os
#      define __OS_MAC__
#    else
#      define __OS_WIN__
#    endif
 
#  elif defined(_WIN32) || defined(WIN32) || defined(_WINDOWS) || defined(_DOS)
// Visual C++, MSC, cygwin gcc and hopefully some others
#    define __OS_WIN__
 
#  elif defined(VAX)
// Just in case anyone is still using VAXes...
#    define __OS_VAX__
 
#  else // default
 
#    define __OS_UNIX__
// subcases
#    if defined(_AIX)
#      define __OS_AIX__
#    elif defined(__sun)
// should really branch on SunOS and Solaris...
#      define __OS_SUN__
#    elif defined(__linux__)
#      define __OS_LINUX__
#    elif defined(__osf__)
#      defined __OS_OSF__
#    endif
 
#  endif // __OS_UNIX_ case
 
#endif // !defined(__OS_xxx_)
 
//***************
START_NAMESPACE_STIR
 
#ifndef _PI
#  if __cplusplus >= 202002L

#    define _PI std::numbers::pi
#  else

#    define _PI 3.1415926535897932384626433832795028841971693993751058209749445923078164062
#  endif
#endif

constexpr double speed_of_light_in_mm_per_ps = 0.299792458;
constexpr double speed_of_light_in_mm_per_ps_div2 = speed_of_light_in_mm_per_ps * 0.5;


template <class NUMBER>
inline NUMBER
square(const NUMBER& x)
{
  return x * x;
}
 
END_NAMESPACE_STIR
 
#endif