#ifndef ZMENVIRONMENT_H
#define ZMENVIRONMENT_H


// ----------------------------------------------------------------------
//
// ZMenvironment.h
//
// History:
//   28-Oct-1997  WEB  Initial draft
//   04-Nov-1997  WEB  Updated for new approach to namespace support
//   11-Nov-1997  WEB  Declare std before using it
//   13-Nov-1997  WEB  Revert to our prior philosophy: program to the
//     C++ standard!
//   11-Dec-1997  WEB  Add support for algorithm
//   05-Jan-1998  WEB  Incorporate updated DEFECT_STANDARD_CPLUSPLUS
//    symbol
//   14-May-1998  WEB  Minor improvements in commentary
//   15-Jun-1998  WEB  Add namespace support via macro definitions,
//     #ifdef'd for compatibility testing and transition
//   14-Feb-2000  WEB  Incorporate ISOcxx compatibility
//   08-Mar-2000  WEB  Update location of ISOcxx.h header
//   10-Aug-2000  WEB  Add ZM_QUAL_NAME
//   18-Jul-2002  JMM  Fix macro that was looking only at GNUC__MINOR
//   24-Mar-2003  WEB  Embed knowledge of gcc 3 compliance
//
// ----------------------------------------------------------------------


// ---  ISOcxx compatibility:

#if defined ISOCXX__ISOCXX

  #include "ISOcxx/ISOcxx.h"

  #ifdef ZM_USE_NAMESPACES
    // Allow zoom's namespace constructs:
    //
    #define ZM_BEGIN_NAMESPACE(ns)	BEGIN_NAMESPACE(ns)
    #define ZM_END_NAMESPACE(ns)	END_NAMESPACE(ns)
    #define ZM_USING_NAMESPACE(ns)	USING_NAMESPACE(ns)
    #define ZM_QUAL_NAME(ns,name)	QUAL_NAME(ns,name)
    #define ZM_BEGIN_UNNAMED_NAMESPACE	BEGIN_UNNAMED_NAMESPACE	
    #define ZM_END_UNNAMED_NAMESPACE	END_UNNAMED_NAMESPACE	
  #else
    // Ignore zoom's namespace constructs:
    //
    #define ZM_BEGIN_NAMESPACE(ns)	/* */
    #define ZM_END_NAMESPACE(ns)	/* */
    #define ZM_USING_NAMESPACE(ns)	/* */
    #define ZM_QUAL_NAME(ns,name)	name
    #define ZM_BEGIN_UNNAMED_NAMESPACE	/* */
    #define ZM_END_UNNAMED_NAMESPACE	/* */
  #endif  // ZM_USE_NAMESPACES

  // Some compilers ignore the meaning of the keyword mutable;
  // for those we can have const member function that changes mutable members:
  //
  #ifdef DEFECT_NO_MUTABLE
    #define mutable_const
  #else
    #define mutable_const const
  #endif

  #define ZM_COVARIANT_TYPE(BaseClass, SubClass)\
     COVARIANT_TYPE(BaseClass, SubClass)


// ---  original code:

#else  // ! defined ISOCXX__ISOCXX


  #if ! defined(DEFECT_STANDARD_CPLUSPLUS)\
    && (defined(__GNUC__)  &&  (__GNUC__ >= 3))
    #define DEFECT_STANDARD_CPLUSPLUS
  #endif

  #if defined(__STANDARD_CPLUSPLUS)  ||  defined(DEFECT_STANDARD_CPLUSPLUS)

    // trigger standard-conforming header file names (alphabetical order):
    //
    #define ZM_STD_cmath
    #define ZM_STD_iomanip
    #define ZM_STD_iosfwd
    #define ZM_STD_iostream
    #define ZM_STD_fstream
    #define ZM_STD_sstream
    #define ZM_USE_STL

    // Allow zoom's namespace constructs:
    //
    #ifndef _MSC_VER
      // ... but not for MSVC++
      //#define ZM_USE_NAMESPACES
    #endif

    #ifndef USING
      #define USING(X) using X;
    #endif

  #else

    // ignore namespace constructs:
    //
    #ifndef using
      #define using #define NOTusing
    #endif
    #ifndef std
      #define std
    #endif
    #ifndef USING
      #define USING(X);
    #endif

  #endif  // __STANDARD_CPLUSPLUS || DEFECT_STANDARD_CPLUSPLUS

  // JMM trying to get things to compile under egcs
  #if defined(__GNUC__) && (__GNUC__ == 2) && (__GNUC_MINOR__ > 90)
    #define ZM_USE_STL
  #endif

  #ifdef ZM_USE_STL
    #define ZM_STD_algorithm
    #define ZM_STD_map
  #endif

  #ifdef ZM_USE_NAMESPACES
    // Allow zoom's namespace constructs:
    //
    #define ZM_BEGIN_NAMESPACE(ns)	namespace ns  {
    #define ZM_END_NAMESPACE(ns)	}  // ns
    #define ZM_USING_NAMESPACE(ns)	USING(namespace ns);
    #define ZM_QUAL_NAME(ns,name)	ns::name
    #define ZM_BEGIN_UNNAMED_NAMESPACE	namespace {
    #define ZM_END_UNNAMED_NAMESPACE	}
  #else
    // Ignore zoom's namespace constructs:
    //
    #define ZM_BEGIN_NAMESPACE(ns)	/* */
    #define ZM_END_NAMESPACE(ns)	/* */
    #define ZM_USING_NAMESPACE(ns)	/* */
    #define ZM_QUAL_NAME(ns,name)	name
    #define ZM_BEGIN_UNNAMED_NAMESPACE	/* */
    #define ZM_END_UNNAMED_NAMESPACE	/* */
  #endif  // ZM_USE_NAMESPACES


  // Cope with absence of covariant return types:
  //
  #ifdef DEFECT_NO_VIRTUAL_COVARIANCE
    #define ZM_COVARIANT_TYPE(BaseClass, SubClass) BaseClass
  #else
    #define ZM_COVARIANT_TYPE(BaseClass, SubClass) SubClass
  #endif // DEFECT_NO_VIRTUAL_COVARIANCE

  // Some compilers ignore the meaning of the keyword mutable;
  // for those we can have const member function that changes mutable members:
  //
  #ifdef DEFECT_NO_MUTABLE
    #define mutable_const
  #else
    #define mutable_const const
  #endif


#endif  // ISOCXX__ISOCXX


// ----------------------------------------------------------------------


#endif  // ZMENVIRONMENT_H