itkMacro.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkMacro.h,v $
  Language:  C++
  Date:      $Date: 2010-04-26 14:32:50 $
  Version:   $Revision: 1.101 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

  Portions of this code are covered under the VTK copyright.
  See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkMacro_h
#define __itkMacro_h

#include "itkWin32Header.h"
#include "itkConfigure.h"

#include <string>
#include <cstdlib>
#ifndef NDEBUG 
#include <cassert>
#endif


// Determine type of string stream to use.
#if !defined(CMAKE_NO_ANSI_STRING_STREAM)
#  include <sstream>
#elif !defined(CMAKE_NO_ANSI_STREAM_HEADERS)
#  include <strstream>
#  define ITK_NO_ANSI_STRING_STREAM
#else
#  include <strstream.h>
#  define ITK_NO_ANSI_STRING_STREAM
#endif

namespace itk
{
} // end namespace itk - this is here for documentation purposes

#define itkNotUsed(x)

#if defined(_MSC_VER) && (_MSC_VER <= 1300) 
#   define ITK_NO_INCLASS_MEMBER_INITIALIZATION
#endif
#if defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x540)
#   define ITK_NO_INCLASS_MEMBER_INITIALIZATION
#endif
#if defined(__SVR4) && !defined(__SUNPRO_CC)
#   define ITK_NO_INCLASS_MEMBER_INITIALIZATION
#endif

// A class template like this will not instantiate on GCC 2.95:
//   template<class T> struct A
//   {
//     static const int N = 1;
//     enum { S = sizeof(A::N) };
//   };
// We need to use enum for static constants instead.
#if defined(__GNUC__)
# define ITK_NO_SIZEOF_CONSTANT_LOOKUP
#endif

#if defined(_MSC_VER) && (_MSC_VER <= 1300) 
#define ITK_NO_SELF_AS_TRAIT_IN_TEMPLATE_ARGUMENTS
#endif

#if defined(ITK_NO_INCLASS_MEMBER_INITIALIZATION) || \
    defined(ITK_NO_SIZEOF_CONSTANT_LOOKUP)
#   define itkStaticConstMacro(name,type,value) enum { name = value }
#else
#   define itkStaticConstMacro(name,type,value) static const type name = value
#endif

#ifdef ITK_NO_SELF_AS_TRAIT_IN_TEMPLATE_ARGUMENTS
#   define itkGetStaticConstMacro(name) name
#else
#   define itkGetStaticConstMacro(name) (Self::name)
#endif

#define itkSetInputMacro(name, type, number) \
  virtual void Set##name##Input(const type *_arg) \
  { \
    itkDebugMacro("setting input " #name " to " << _arg); \
    if (_arg != static_cast<type *>(this->ProcessObject::GetInput( number ))) \
      { \
      this->ProcessObject::SetNthInput( number, const_cast<type *>(_arg) ); \
      this->Modified(); \
      } \
  } \
  virtual void SetInput##number(const type *_arg) \
  { \
    itkDebugMacro("setting input " #number " to " << _arg); \
    if (_arg != static_cast<type *>(this->ProcessObject::GetInput( number ))) \
      { \
      this->ProcessObject::SetNthInput( number, const_cast<type *>(_arg) ); \
      this->Modified(); \
      } \
  } 


#define itkSuperclassTraitMacro(traitnameType) \
  typedef typename Superclass::traitnameType traitnameType;

#define itkGetInputMacro(name, type, number) \
  virtual const type * Get##name##Input() const \
  { \
    itkDebugMacro("returning input " << #name " of " << static_cast<const type *>(this->ProcessObject::GetInput( number )) ); \
    return static_cast<const type *>(this->ProcessObject::GetInput( number )); \
  } \
  virtual const type * GetInput##number() const \
  { \
    itkDebugMacro("returning input " << #number " of " << static_cast<const type *>(this->ProcessObject::GetInput( number )) ); \
    return static_cast<const type *>(this->ProcessObject::GetInput( number )); \
  } 


#define itkSetDecoratedInputMacro(name, type, number) \
  itkSetInputMacro(name, SimpleDataObjectDecorator<type>, number); \
  itkGetInputMacro(name, SimpleDataObjectDecorator<type>, number); \
  virtual void Set##name(const type &_arg) \
  { \
    typedef SimpleDataObjectDecorator< type > DecoratorType; \
    itkDebugMacro("setting input " #name " to " << _arg); \
    const DecoratorType * oldInput = \
      static_cast< const DecoratorType * >( \
        this->ProcessObject::GetInput(number) ); \
    if( oldInput && oldInput->Get() == _arg ) \
      { \
      return; \
      } \
    typename DecoratorType::Pointer newInput = DecoratorType::New(); \
    newInput->Set( _arg ); \
    this->Set##name##Input( newInput ); \
  }


#define itkSetDecoratedObjectInputMacro(name, type, number) \
  itkSetInputMacro(name, DataObjectDecorator<type>, number); \
  itkGetInputMacro(name, DataObjectDecorator<type>, number); \
  virtual void Set##name(const type *_arg) \
  { \
    typedef DataObjectDecorator< type > DecoratorType; \
    itkDebugMacro("setting input " #name " to " << _arg); \
    const DecoratorType * oldInput = \
      static_cast< const DecoratorType * >( \
        this->ProcessObject::GetInput(number) ); \
    if( oldInput && oldInput->Get() == _arg ) \
      { \
      return; \
      } \
    typename DecoratorType::Pointer newInput = DecoratorType::New(); \
    newInput->Set( _arg ); \
    this->Set##name##Input( newInput ); \
  }



#define itkSetMacro(name,type) \
  virtual void Set##name (const type _arg) \
  { \
    itkDebugMacro("setting " #name " to " << _arg); \
    if (this->m_##name != _arg) \
      { \
      this->m_##name = _arg; \
      this->Modified(); \
      } \
  } 


#define itkGetMacro(name,type) \
  virtual type Get##name () \
  { \
    itkDebugMacro("returning " << #name " of " << this->m_##name ); \
    return this->m_##name; \
  }


#define itkGetConstMacro(name,type) \
  virtual type Get##name () const \
  { \
    itkDebugMacro("returning " << #name " of " << this->m_##name ); \
    return this->m_##name; \
  }


#define itkGetConstReferenceMacro(name,type) \
  virtual const type & Get##name () const \
  { \
    itkDebugMacro("returning " << #name " of " << this->m_##name ); \
    return this->m_##name; \
  }


#define itkSetEnumMacro(name,type) \
  virtual void Set##name (const type _arg) \
  { \
    itkDebugMacro("setting " #name " to " << static_cast<long>(_arg)); \
    if (this->m_##name != _arg) \
      { \
      this->m_##name = _arg; \
      this->Modified(); \
      } \
  } 


#define itkGetEnumMacro(name,type) \
  virtual type Get##name () const \
  { \
    itkDebugMacro("returning " << #name " of " << static_cast<long>(this->m_##name) ); \
    return this->m_##name; \
  }


#define itkSetStringMacro(name) \
  virtual void Set##name (const char* _arg) \
  { \
    if ( _arg && (_arg == this->m_##name) ) { return;} \
    if (_arg) \
      { \
      this->m_##name = _arg;\
      } \
     else \
      { \
      this->m_##name = ""; \
      } \
    this->Modified(); \
  } \
  virtual void Set##name (const std::string & _arg) \
  { \
    this->Set##name( _arg.c_str() ); \
  } \



#define itkGetStringMacro(name) \
  virtual const char* Get##name () const \
  { \
    return this->m_##name.c_str(); \
  }

#define itkSetClampMacro(name,type,min,max) \
  virtual void Set##name (type _arg) \
  { \
    itkDebugMacro("setting " << #name " to " << _arg ); \
    if (this->m_##name != (_arg<min?min:(_arg>max?max:_arg))) \
      { \
      this->m_##name = (_arg<min?min:(_arg>max?max:_arg)); \
      this->Modified(); \
      } \
  } 


#define itkSetObjectMacro(name,type) \
  virtual void Set##name (type* _arg) \
  { \
    itkDebugMacro("setting " << #name " to " << _arg ); \
    if (this->m_##name != _arg) \
      { \
      this->m_##name = _arg; \
      this->Modified(); \
      } \
  } 


#define itkGetObjectMacro(name,type) \
  virtual type * Get##name () \
  { \
    itkDebugMacro("returning " #name " address " << this->m_##name ); \
    return this->m_##name.GetPointer(); \
  } 


#define itkSetConstObjectMacro(name,type) \
  virtual void Set##name (const type* _arg) \
  { \
    itkDebugMacro("setting " << #name " to " << _arg ); \
    if (this->m_##name != _arg) \
      { \
      this->m_##name = _arg; \
      this->Modified(); \
      } \
  } 



#define itkGetConstObjectMacro(name,type) \
  virtual const type * Get##name () const \
  { \
    itkDebugMacro("returning " #name " address " << this->m_##name ); \
    return this->m_##name.GetPointer(); \
  } 


#define itkGetConstReferenceObjectMacro(name,type) \
  virtual const typename type::Pointer & Get##name () const \
  { \
    itkDebugMacro("returning " #name " address " << this->m_##name ); \
    return this->m_##name; \
  } 


#define itkBooleanMacro(name) \
  virtual void name##On () { this->Set##name(true);} \
  virtual void name##Off () { this->Set##name(false);}


#define itkSetVectorMacro(name,type,count) \
  virtual void Set##name(type data[]) \
  { \
    unsigned int i; \
    for (i=0; i<count; i++) { if ( data[i] != this->m_##name[i] ) { break; }} \
    if ( i < count ) \
      { \
      this->Modified(); \
      for (i=0; i<count; i++) { this->m_##name[i] = data[i]; }\
      } \
  }


#define itkGetVectorMacro(name,type,count) \
  virtual type *Get##name () const \
  { \
    return this->m_##name; \
  } 

#define itkNewMacro(x) \
static Pointer New(void) \
{ \
  Pointer smartPtr = ::itk::ObjectFactory<x>::Create(); \
  if(smartPtr.GetPointer() == NULL) \
    { \
    smartPtr = new x; \
    } \
  smartPtr->UnRegister(); \
  return smartPtr; \
} \
virtual ::itk::LightObject::Pointer CreateAnother(void) const \
{ \
  ::itk::LightObject::Pointer smartPtr; \
  smartPtr = x::New().GetPointer(); \
  return smartPtr; \
}



#define itkFactorylessNewMacro(x) \
static Pointer New(void) \
{ \
  Pointer smartPtr; \
  x *rawPtr = new x; \
  smartPtr = rawPtr; \
  rawPtr->UnRegister(); \
  return smartPtr; \
} \
  virtual ::itk::LightObject::Pointer CreateAnother(void) const \
{ \
  ::itk::LightObject::Pointer smartPtr;         \
  smartPtr = x::New().GetPointer(); \
  return smartPtr; \
}


#define itkTypeMacro(thisClass,superclass) \
    virtual const char *GetNameOfClass() const \
        {return #thisClass;} 


namespace itk
{
extern ITKCommon_EXPORT void OutputWindowDisplayText(const char*);
extern ITKCommon_EXPORT void OutputWindowDisplayErrorText(const char*);
extern ITKCommon_EXPORT void OutputWindowDisplayWarningText(const char*);
extern ITKCommon_EXPORT void OutputWindowDisplayGenericOutputText(const char*);
extern ITKCommon_EXPORT void OutputWindowDisplayDebugText(const char*);
} // end namespace itk

#if defined(ITK_LEAN_AND_MEAN) || defined(__BORLANDC__) || defined(NDEBUG)
#define itkDebugMacro(x)
#else
#define itkDebugMacro(x) \
  { if (this->GetDebug() && ::itk::Object::GetGlobalWarningDisplay())   \
    { ::itk::OStringStream itkmsg; \
      itkmsg << "Debug: In " __FILE__ ", line " << __LINE__ << "\n" \
             << this->GetNameOfClass() << " (" << this << "): " x  \
             << "\n\n"; \
      ::itk::OutputWindowDisplayDebugText(itkmsg.str().c_str());} \
}
#endif



#ifdef ITK_LEAN_AND_MEAN
#define itkWarningMacro(x)
#else
#define itkWarningMacro(x) \
{ if (::itk::Object::GetGlobalWarningDisplay()) \
    { ::itk::OStringStream itkmsg; \
      itkmsg << "WARNING: In " __FILE__ ", line " << __LINE__ << "\n" \
             << this->GetNameOfClass() << " (" << this << "): " x  \
             << "\n\n"; \
      ::itk::OutputWindowDisplayWarningText(itkmsg.str().c_str());} \
}
#endif


namespace itk
{

#if !defined(ITK_NO_ANSI_STRING_STREAM)
class OStringStream: public std::ostringstream
{
public:
  OStringStream() {}
private:
  OStringStream(const OStringStream&);
  void operator=(const OStringStream&);
};
#else
namespace OStringStreamDetail
{
  class Cleanup
  {
  public:
    Cleanup(std::ostrstream& ostr): m_OStrStream(ostr) {}
    ~Cleanup() { m_OStrStream.rdbuf()->freeze(0); }
    static void IgnoreUnusedVariable(const Cleanup&) {}
  protected:
    std::ostrstream& m_OStrStream;
  };
}//namespace OStringStreamDetail

class OStringStream: public std::ostrstream
{
public:
  typedef std::ostrstream Superclass;
  OStringStream() {}
  std::string str()
    {
      OStringStreamDetail::Cleanup cleanup(*this);
      OStringStreamDetail::Cleanup::IgnoreUnusedVariable(cleanup);
      int pcount = this->pcount();
      const char* ptr = this->Superclass::str();
      return std::string(ptr?ptr:"", pcount);
    }
private:
  OStringStream(const OStringStream&);
  void operator=(const OStringStream&);
};
#endif

}//namespace itk

#if defined(ITK_CPP_FUNCTION)
  #if defined(__BORLANDC__)
    #define ITK_LOCATION __FUNC__
  #elif defined(_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(CABLE_CONFIGURATION) && !defined(CSWIG)
    #define ITK_LOCATION __FUNCSIG__
  #elif defined(__GNUC__)
    #define ITK_LOCATION __PRETTY_FUNCTION__
  #else
    #define ITK_LOCATION __FUNCTION__
  #endif
#else
  #define ITK_LOCATION "unknown"
#endif

#include "itkExceptionObject.h"

#define itkExceptionMacro(x) \
  { \
  ::itk::OStringStream message; \
  message << "itk::ERROR: " << this->GetNameOfClass() \
          << "(" << this << "): " x; \
  ::itk::ExceptionObject e_(__FILE__, __LINE__, message.str().c_str(),ITK_LOCATION); \
  throw e_; /* Explicit naming to work around Intel compiler bug.  */ \
  }


#define itkGenericExceptionMacro(x) \
  { \
  ::itk::OStringStream message; \
  message << "itk::ERROR: " x; \
  ::itk::ExceptionObject e_(__FILE__, __LINE__, message.str().c_str(),ITK_LOCATION); \
  throw e_; /* Explicit naming to work around Intel compiler bug.  */ \
  }

#ifdef ITK_LEAN_AND_MEAN
#define itkGenericOutputMacro(x)
#else
#define itkGenericOutputMacro(x) \
{ if (::itk::Object::GetGlobalWarningDisplay()) \
    { ::itk::OStringStream itkmsg; \
      itkmsg << "WARNING: In " __FILE__ ", line " << __LINE__ << "\n" \
             x << "\n\n"; \
      ::itk::OutputWindowDisplayGenericOutputText(itkmsg.str().c_str());} \
}
#endif

//----------------------------------------------------------------------------
// Macros for simplifying the use of logging
//
#define itkLogMacro( x, y)  \
{         \
  if (this->GetLogger() ) \
    {  \
    this->GetLogger()->Write(::itk::LoggerBase::x, y); \
    }  \
}


#define itkLogMacroStatic( obj, x, y)  \
{         \
  if (obj->GetLogger() ) \
    {  \
    obj->GetLogger()->Write(::itk::LoggerBase::x, y); \
    }  \
}


//----------------------------------------------------------------------------
// Setup legacy code policy.
//
// CMake options ITK_LEGACY_REMOVE and ITK_LEGACY_SILENT are converted
// to definitions (or non-defs) in itkConfigure.h and tested below.
// They may be used to completely remove legacy code or silence the
// warnings.  The default is to warn about their use.
//
// Source files that test the legacy code may define ITK_LEGACY_TEST
// like this:
//
//  #define ITK_LEGACY_TEST
//  #include "itkClassWithDeprecatedMethod.h"
//
// in order to silence the warnings for calling deprecated methods.
// No other source files in ITK should call the methods since they are
// provided only for compatibility with older user code.

// Define itkLegacyMacro to mark legacy methods where they are
// declared in their class.  Example usage:
//
//   // @deprecated Replaced by MyOtherMethod() as of ITK 2.0.
//   itkLegacyMacro(void MyMethod());
#if defined(ITK_LEGACY_REMOVE)
// Remove legacy methods completely.  Put a bogus declaration in
// place to avoid stray semicolons because this is an error for some
// compilers.  Using a class forward declaration allows any number
// of repeats in any context without generating unique names.
# define itkLegacyMacro(method) class itkLegacyMethodRemoved /* no ';' */
#elif defined(ITK_LEGACY_SILENT) || defined(ITK_LEGACY_TEST) || defined(CSWIG)
  // Provide legacy methods with no warnings.
# define itkLegacyMacro(method) method
#else
  // Setup compile-time warnings for uses of deprecated methods if
  // possible on this compiler.
# if defined(__GNUC__) && !defined(__INTEL_COMPILER) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
#  define itkLegacyMacro(method) method __attribute__((deprecated))
# elif defined(_MSC_VER) && _MSC_VER >= 1300
#  define itkLegacyMacro(method) __declspec(deprecated) method
# else
#  define itkLegacyMacro(method) method
# endif
#endif

// Macros to create runtime deprecation warning messages in function
// bodies.  Example usage:
//
//   void itkMyClass::MyOldMethod()
//     {
//     itkLegacyBodyMacro(itkMyClass::MyOldMethod, 2.0);
//     }
//
//   void itkMyClass::MyMethod()
//     {
//     itkLegacyReplaceBodyMacro(itkMyClass::MyMethod, 2.0,
//                               itkMyClass::MyOtherMethod);
//     }
#if defined(ITK_LEGACY_REMOVE) || defined(ITK_LEGACY_SILENT)
# define itkLegacyBodyMacro(method, version)
# define itkLegacyReplaceBodyMacro(method, version, replace)
# define itkGenericLegacyBodyMacro(method, version)
# define itkGenericLegacyReplaceBodyMacro(method, version, replace)
#else
# define itkLegacyBodyMacro(method, version) \
  itkWarningMacro(#method " was deprecated for ITK " #version " and will be removed in a future version.")
# define itkLegacyReplaceBodyMacro(method, version, replace) \
  itkWarningMacro(#method " was deprecated for ITK " #version " and will be removed in a future version.  Use " #replace " instead.")
# define itkGenericLegacyBodyMacro(method, version) \
  itkGenericOutputMacro(#method " was deprecated for ITK " #version " and will be removed in a future version.")
# define itkGenericLegacyReplaceBodyMacro(method, version, replace) \
  itkGenericOutputMacro(#method " was deprecated for ITK " #version " and will be removed in a future version.  Use " #replace " instead.")
#endif

#if defined(__INTEL_COMPILER)
# pragma warning (disable: 193) /* #if testing undefined identifier */
#endif

//=============================================================================
/* Define a common way of declaring a templated function as a friend inside a class.
  - ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENTS(T) 

  The following templated function 

            template <T>
            T add(const T & a, const T & b);

  is declared as friend in some compilers as:

            class A
              {
              public:
                friend Self add<Self>( const Self & a, const Self & b );
              }

   while other compilers will do

            class A
              {
              public:
                friend Self add<>( const Self & a, const Self & b );
              }

   This characteristic of the compiler is checked by a TRY_COMPILE
   command defined in Insight/CMake/itkTestFriendTemplatedFunction.cxx

*/
#if defined(ITK_SUPPORTS_TEMPLATED_FRIEND_FUNCTION_WITH_NULL_STRING)
#define ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT(T)
#else
#if defined(ITK_SUPPORTS_TEMPLATED_FRIEND_FUNCTION_WITH_EMPTY_BRACKETS)
#define ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT(T)  <>
#else
#if defined(ITK_SUPPORTS_TEMPLATED_FRIEND_FUNCTION_WITH_TEMPLATE_ARGUMENTS)
#define ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT(T)  <T>
#endif
#endif
#endif
// THIS IS A TEMPORARY PATCH FOR Visual Studio 10. The correct solution must
// be implemented in Insight/CMake/itkTestFriendTemplatedFunction.cxx
#if ( defined (_MSC_VER) && ( _MSC_VER >= 1600 ) )
#ifdef  ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT
#undef  ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT
#endif
#define ITK_FRIEND_TEMPLATE_FUNCTION_ARGUMENT(T)
#endif


//=============================================================================
/* Choose a way to prevent template instantiation on this platform.
  - ITK_TEMPLATE_DO_NOT_INSTANTIATE = use #pragma do_not_instantiate to
                                      prevent instantiation
  - ITK_TEMPLATE_EXTERN = use extern template to prevent instantiation

   Note that VS 6 supports extern template instantiation but it is
   hard to block the resulting warning because its stream headers
   re-enable it.  Therefore we just disable support for now.
*/
#if defined(__sgi) && defined(_COMPILER_VERSION)
# define ITK_TEMPLATE_DO_NOT_INSTANTIATE 1
#elif defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 700
# define ITK_TEMPLATE_EXTERN 1
#elif defined(__GNUC__) && __GNUC__ >= 3
# define ITK_TEMPLATE_EXTERN 1
#elif defined(_MSC_VER) && _MSC_VER >= 1300
# define ITK_TEMPLATE_EXTERN 1
#endif
#if !defined(ITK_TEMPLATE_DO_NOT_INSTANTIATE)
# define ITK_TEMPLATE_DO_NOT_INSTANTIATE 0
#endif
#if !defined(ITK_TEMPLATE_EXTERN)
# define ITK_TEMPLATE_EXTERN 0
#endif

/* Define a macro to explicitly instantiate a template.
  - ITK_TEMPLATE_EXPORT(X) =
      Explicitly instantiate X, where X is of the form N(a1[,a2...,aN]).
      examples: ITK_TEMPLATE_EXPORT(1(class Foo<int>))
                ITK_TEMPLATE_EXPORT(2(class Bar<int, char>))
      Use one level of expansion delay to allow user code to have
      a macro determining the number of arguments. */
#define ITK_TEMPLATE_EXPORT(x) ITK_TEMPLATE_EXPORT_DELAY(x)
#define ITK_TEMPLATE_EXPORT_DELAY(x) template ITK_TEMPLATE_##x;

/* Define a macro to prevent template instantiations.
  - ITK_TEMPLATE_IMPORT(X) =
      Prevent instantiation of X, where X is of the form N(a1[,a2...,aN]).
      examples: ITK_TEMPLATE_IMPORT(1(class Foo<int>))
                ITK_TEMPLATE_IMPORT(2(class Bar<int, char>))
      Use one level of expansion delay to allow user code to have
      a macro determining the number of arguments.
*/
#if ITK_TEMPLATE_EXTERN
# define ITK_TEMPLATE_IMPORT_DELAY(x) extern template ITK_TEMPLATE_##x;
# if defined(_MSC_VER)
#  pragma warning (disable: 4231) /* extern template extension */
# endif
#elif ITK_TEMPLATE_DO_NOT_INSTANTIATE
# define ITK_TEMPLATE_IMPORT_DELAY(x) \
         ITK_TEMPLATE_IMPORT_IMPL(do_not_instantiate ITK_TEMPLATE_##x)
# define ITK_TEMPLATE_IMPORT_IMPL(x) _Pragma(#x)
#endif
#if defined(ITK_TEMPLATE_IMPORT_DELAY)
# define ITK_TEMPLATE_IMPORT(x) ITK_TEMPLATE_IMPORT_DELAY(x)
# define ITK_TEMPLATE_IMPORT_WORKS 1
#else
# define ITK_TEMPLATE_IMPORT(x)
# define ITK_TEMPLATE_IMPORT_WORKS 0
#endif

/* Define macros to export and import template instantiations.  These
   depend on each class providing a macro defining the instantiations
   given template arguments in X.  The argument X is of the form
   N(a1[,a2...,aN]).  The argument Y is a valid preprocessing token
   unique to the template arguments given in X.  Typical usage is

     ITK_EXPORT_TEMPLATE(itkfoo_EXPORT, Foo, (int), I)
     ITK_EXPORT_TEMPLATE(itkfoo_EXPORT, Bar, (int, char), IC)

   The ITK_TEMPLATE_<name> macro should be defined in itk<name>.h and
   is of the following form:

     #define ITK_TEMPLATE_<name>(_, EXPORT, x, y) namespace itk { \
       _(<n>(class EXPORT <name>< ITK_TEMPLATE_<n> x >)) \
       namespace Templates { typedef <name>< ITK_TEMPLATE_<n> x > <name>##y; }\
     }

   The argument "_" will be replaced by another macro such as
   ITK_TEMPLATE_EXPORT or ITK_TEMPLATE_IMPORT, so it should be used as
   if calling one of these macros.  The argument "EXPORT" will be
   replaced by a dllexport/dllimport macro such as ITKCommon_EXPORT.
   The argument "x" is a paren-enclosed list of template arguments.
   The argument "y" is a preprocessing token corresponding to the
   given template arguments and should be used to construct typedef
   names for the instantiations.

   Note the use of ITK_TEMPLATE_<n>, where <n> is the number of
   template arguments for the class template.  Note also that the
   number of template arguments is usually the length of the list
   nested within the inner parentheses, so the instantiation is listed
   with the form <n>(...).  Example definitions:

     #define ITK_TEMPLATE_Foo(_, EXPORT, x, y) namespace itk { \
       _(1(class EXPORT Foo< ITK_TEMPLATE_1 x >)) \
       _(1(EXPORT std::ostream& operator<<(std::ostream&, \
                                           const Foo< ITK_TEMPLATE_1 x >&))) \
       namespace Templates { typedef Foo< ITK_TEMPLATE_1 x > Foo##y; }\
     }

     #define ITK_TEMPLATE_Bar(_, EXPORT, x, y) namespace itk { \
       _(2(class EXPORT Bar< ITK_TEMPLATE_2 x >)) \
       _(1(EXPORT std::ostream& operator<<(std::ostream&, \
                                           const Bar< ITK_TEMPLATE_2 x >&))) \
       namespace Templates { typedef Bar< ITK_TEMPLATE_2 x > Bar##y; }\
     }

   Note that in the stream operator for template Bar there is a "1" at
   the beginning even though two arguments are taken.  This is because
   the expression "ITK_TEMPLATE_2 x" is contained inside the
   parentheses of the function signature which protects the resulting
   comma from separating macro arguments.  Therefore the nested
   parentheses contain a list of only one macro argument.

   The ITK_EMPTY macro used in these definitions is a hack to work
   around a VS 6.0 preprocessor bug when EXPORT is empty.
*/
#define ITK_EXPORT_TEMPLATE(EXPORT, c, x, y) \
        ITK_TEMPLATE_##c(ITK_TEMPLATE_EXPORT, EXPORT ITK_EMPTY, x, y)
#define ITK_IMPORT_TEMPLATE(EXPORT, c, x, y) \
        ITK_TEMPLATE_##c(ITK_TEMPLATE_IMPORT, EXPORT ITK_EMPTY, x, y)
#define ITK_EMPTY

/* Define macros to support passing a variable number of arguments
   throug other macros.  This is used by ITK_TEMPLATE_EXPORT,
   ITK_TEMPLATE_IMPORT, and by each template's instantiation
   macro.  */
#define ITK_TEMPLATE_1(x1)                         x1
#define ITK_TEMPLATE_2(x1,x2)                      x1,x2
#define ITK_TEMPLATE_3(x1,x2,x3)                   x1,x2,x3
#define ITK_TEMPLATE_4(x1,x2,x3,x4)                x1,x2,x3,x4
#define ITK_TEMPLATE_5(x1,x2,x3,x4,x5)             x1,x2,x3,x4,x5
#define ITK_TEMPLATE_6(x1,x2,x3,x4,x5,x6)          x1,x2,x3,x4,x5,x6
#define ITK_TEMPLATE_7(x1,x2,x3,x4,x5,x6,x7)       x1,x2,x3,x4,x5,x6,x7
#define ITK_TEMPLATE_8(x1,x2,x3,x4,x5,x6,x7,x8)    x1,x2,x3,x4,x5,x6,x7,x8
#define ITK_TEMPLATE_9(x1,x2,x3,x4,x5,x6,x7,x8,x9) x1,x2,x3,x4,x5,x6,x7,x8,x9

/* In order to support both implicit and explicit instantation a .h
   file needs to know whether it should include its .txx file
   containing the template definitions.  Define a macro to tell
   it.  Typical usage in itkFoo.h:
     #if ITK_TEMPLATE_TXX
     # include "itkFoo.txx"
     #endif
*/
#if defined(ITK_MANUAL_INSTANTIATION)
# define ITK_TEMPLATE_TXX 0
#else
# define ITK_TEMPLATE_TXX !(ITK_TEMPLATE_CXX || ITK_TEMPLATE_TYPE)
#endif

/* All explicit instantiation source files define ITK_TEMPLATE_CXX.
   Define ITK_MANUAL_INSTANTIATION to tell .h files that have not been
   converted to this explicit instantiation scheme to not include
   their .txx files.  Also disable warnings that commonly occur in
   these files but are not useful.  */
#if ITK_TEMPLATE_CXX
# undef ITK_MANUAL_INSTANTIATION
# define ITK_MANUAL_INSTANTIATION
# if defined(_MSC_VER)
#  pragma warning (disable: 4275) /* non dll-interface base */
#  pragma warning (disable: 4661) /* no definition available */
# endif
#endif
//=============================================================================

/* Define macros to export and import template instantiations for each
   library in ITK.  */
#define ITK_EXPORT_ITKCommon(c, x, n) \
        ITK_EXPORT_TEMPLATE(ITKCommon_EXPORT, c, x, n)
#define ITK_IMPORT_ITKCommon(c, x, n) \
        ITK_IMPORT_TEMPLATE(ITKCommon_EXPORT, c, x, n)

/* Define a macro to decide whether to block instantiation of ITK
   templates.  They should be blocked only if the platform supports
   blocking template instantiation and the explicit instantiations are
   available.

   - ITK_TEMPLATE_EXPLICIT =
      Whether to include "XXX+-.h" from "XXX.h" to prevent implicit
      instantiations of templates explicitly instantiated elsewhere.
      Typical usage in itkFoo.h:
        #if ITK_TEMPLATE_EXPLICIT
        # include "itkFoo+-.h"
        #endif
*/
#if ITK_TEMPLATE_IMPORT_WORKS && defined(ITK_EXPLICIT_INSTANTIATION)
# define ITK_TEMPLATE_EXPLICIT !ITK_TEMPLATE_CXX
#else
# define ITK_TEMPLATE_EXPLICIT 0
#endif


//----------------------------------------------------------------------------
// Macro to declare that a function does not return. __attribute__((noreturn))
//    On some compiler, functions that do not return (ex: exit(0)) must
//    have the noreturn attribute. Otherwise, a warning is raised. Use
//    that macro to avoid those warnings. GCC defines the attribute
//    noreturn for versions 2.5 and higher.
#if defined(__GNUC__)
#  if (((__GNUC__ == 2) && (__GNUC_MINOR__ >= 5)) || (__GNUC__ >= 3))
#    define ITK_NO_RETURN \
       __attribute__ ((noreturn))
#  endif
#else
#  define ITK_NO_RETURN
#endif


#ifdef ITK_USE_TEMPLATE_META_PROGRAMMING_LOOP_UNROLLING
//--------------------------------------------------------------------------------
//  Helper macros for Template Meta-Programming techniques of for-loops unrolling
//--------------------------------------------------------------------------------

//--------------------------------------------------------------------------------
// Macro that generates an unrolled for loop for assigning elements of one array
// to elements of another array The array are assumed to be of same length
// (dimension), and this is also assumed to be the value of NumberOfIterations.
// No verification of size is performed. Casting is perfomed as part of the
// assignment, by using the DestinationElementType as the casting type. 
// Source and destination array types must have defined opearator[] in their API.
#define itkForLoopAssignmentMacro(DestinationType,SourceType,DestinationElementType,DestinationArray,SourceArray,NumberOfIterations) \
    for(unsigned int i=0;i < NumberOfIterations; ++i) \
      { \
      DestinationArray[i] = static_cast< DestinationElementType >( SourceArray[i] ); \
      }

//--------------------------------------------------------------------------------
// Macro that generates an unrolled for loop for rounding and assigning
// elements of one array to elements of another array The array are assumed to
// be of same length (dimension), and this is also assumed to be the value of
// NumberOfIterations.  No verification of size is performed. Casting is
// perfomed as part of the assignment, by using the DestinationElementType as
// the casting type. 
// Source and destination array types must have defined opearator[] in their API.
#define itkForLoopRoundingAndAssignmentMacro(DestinationType,Sourcrnd_halfintup,DestinationElementType,DestinationArray,SourceArray,NumberOfIterations) \
    for(unsigned int i=0;i < NumberOfIterations; ++i) \
      { \
      DestinationArray[i] = itk::Math::Round< DestinationElementType >( SourceArray[i] ); \
      }

#endif
// end of Template Meta Programming helper macros


#ifndef NDEBUG 

#ifdef _POSIX_SOURCE
#define itkAssertInDebugOrThrowInReleaseMacro(msg) __assert_fail (msg, __FILE__, __LINE__, __ASSERT_FUNCTION);
#else
#define itkAssertInDebugOrThrowInReleaseMacro(msg) itkGenericExceptionMacro( << msg );
#endif

#else 
#define itkAssertInDebugOrThrowInReleaseMacro(msg) itkGenericExceptionMacro( << msg);
#endif

#define itkAssertOrThrowMacro(test, message) \
   if( !(test) ) \
     { \
     ::itk::OStringStream msgstr; \
     msgstr << message;      \
     itkAssertInDebugOrThrowInReleaseMacro( msgstr.str().c_str() ); \
     }

#endif //end of itkMacro.h