/*

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Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
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This product is protected by copyright and distributed under the following
license restricting its use.

The Interface Definition Language Compiler Front End (CFE) is made
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notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
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*/

#ifndef _IDL_NARROW_IDL_NARROW_HH
#define _IDL_NARROW_IDL_NARROW_HH


// idl_narrow.hh
//
// Implement IDL narrowing mechanism. Not intended to be read by humans..
//
// Logic:
//
// The DEF_xxx macros are used in class declarations.
// The IMPL_xxx macros are used in class implementations.
//
// The DEF_xxx macros come in two flavors. The first one, DEF_NARROW_METHODSn,
// defines the narrowing mechanism. It declares a static class function whose
// address is used as the class identifier. Then, it declares a narrow op
// with an implementation suitable for narrowing from exactly 'n' superclasses.
// The names of the superclass types are given as arguments. The second flavor
// implements specific narrowing mechanisms from AST_decl and from UTL_scope.
// These macros are named DEF_NARROW_FROM_DECL and DEF_NARROW_FROM_SCOPE
// respectively.
//
// The IMPL_xxx macros also come in two flavors, corresponding to the two
// flavors of DEF_xxx macros. The IMPL_NARROW_METHODSn macros implement the
// narrowing mechanism for classes which must be narrowed from 'n' ancestors.
// The IMPL_NARROW_FROM_DECL and IMPL_NARROW_FROM_SCOPE macros implement
// the narrowing mechanisms for narrowing from instances of AST_decl and
// UTL_scope.
//
// IMPL_NARROW_METHODSn where n is 0,1,2 and 3 are provided.
// DEF_NARROW_METHODSn where n is 0,1,2 and 3 are provided.

extern char *type_id_to_string(long);

#define DEF_NARROW_METHODS0(TYPE)\
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS0(TYPE)\
int \
TYPE::type_id() \
{\
  return 0;\
}\
const void* \
TYPE::narrow(long type_const) const {\
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  return rval; \
}

#define DEF_NARROW_METHODS1(TYPE,PARENT) \
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS1(TYPE,PARENT) \
int \
TYPE::type_id() \
{\
   return 0;\
}\
const void*  \
TYPE::narrow(long type_const) const {\
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  if (rval == NULL) \
    rval = PARENT::narrow(type_const);\
  return rval;\
}

#define DEF_NARROW_METHODS2(TYPE,PARENT1,PARENT2) \
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS2(TYPE,PARENT1,PARENT2) \
int \
TYPE::type_id() \
{\
   return 0;\
}\
const void*  \
TYPE::narrow(long type_const) const { \
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  if (rval == NULL) \
    rval = PARENT1::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT2::narrow(type_const);\
  return rval;\
}

#define DEF_NARROW_METHODS3(TYPE,PARENT1,PARENT2,PARENT3) \
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS3(TYPE,PARENT1,PARENT2,PARENT3) \
int \
TYPE::type_id() \
{\
   return 0;\
}\
const void*  \
TYPE::narrow(long type_const) const {\
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  if (rval == NULL) \
    rval = PARENT1::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT2::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT3::narrow(type_const);\
  return rval;\
}

#define DEF_NARROW_METHODS4(TYPE,PARENT1,PARENT2,PARENT3,PARENT4) \
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS4(TYPE,PARENT1,PARENT2,PARENT3,PARENT4) \
int \
TYPE::type_id() \
{\
   return 0;\
}\
const void*  \
TYPE::narrow(long type_const) const {\
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  if (rval == NULL) \
    rval = PARENT1::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT2::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT3::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT4::narrow(type_const);\
  return rval;\
}

#define DEF_NARROW_METHODS5(TYPE,PARENT1,PARENT2,PARENT3,PARENT4,PARENT5) \
static int type_id(); \
virtual const void* narrow(long type_const) const


#define IMPL_NARROW_METHODS5(TYPE,PARENT1,PARENT2,PARENT3,PARENT4,PARENT5) \
int \
TYPE::type_id() \
{\
   return 0;\
}\
const void*  \
TYPE::narrow(long type_const) const {\
  const void* rval = NULL; \
  if (type_const == (long)&TYPE::type_id) \
    rval = this; \
  if (rval == NULL) \
    rval = PARENT1::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT2::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT3::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT4::narrow(type_const);\
  if (rval == NULL) \
    rval = PARENT5::narrow(type_const);\
  return rval;\
}

#define DEF_NARROW_FROM_DECL(TYPE)\
static TYPE *narrow_from_decl(AST_Decl *t)


#define IMPL_NARROW_FROM_DECL(TYPE)\
TYPE * \
TYPE::narrow_from_decl(AST_Decl *t) { \
   return (TYPE *)t->narrow((long)&TYPE::type_id);\
}

#define DEF_NARROW_FROM_SCOPE(TYPE)\
static TYPE *narrow_from_scope(UTL_Scope *t)


#define IMPL_NARROW_FROM_SCOPE(TYPE)\
TYPE * \
TYPE::narrow_from_scope(UTL_Scope *t) { \
    return (TYPE *)t->narrow((long)&TYPE::type_id);\
}

#endif // _IDL_NARROW_IDL_NARROW_HH
