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I just would like to put this  idea on the list. I have the code, too,
but to me, my code seems still to be too much custom, so I do not post
it yet.  If there  would be interest, I would review it  and put it on
the wiki together with  a small patch to tolua4.

Juergen Fuhrmann

So this is my current description of luabind.
-- Purpose: Bind C  code via specially marked up header
-- files to Lua. It is intended to work for simple interfaces
-- passing basic data types and user defined datatypes to Lua.
-- It works by generating a pkg description and piping it
-- directly to tolua.
-- The reason for this implementation is obvious: we want to
-- generate binding code just from the C header, so we clean
-- it up using some markup, instead of doing this manually
-- and introducing inconsistencies.

-- Currently, the markup consists of:
-- LuaBind : Pass line to tolua (subject to subsequent substitutions)
-- LuaBindSub(x,y) :substitute y for x in all passed lines 
-- LuaBindLua(file): embed Lua code from file 
-- LuaBindGC(class, destructor) : declare class destructor for gc

And here  is a vector  class header with  luabind tags. It is  work in
progress, so don't get shocked... I  put a Lua shadow class around it,
allowing        for        lua-typical        constructors        like
v=DBlockVector{nrow=10,ncol=20}  and  to  write  code  like  v[i]  for
vectors and v[i][j] for block vectors.

#ifndef DVECTOR_H
#define DVECTOR_H
#include "stdsys/complex.h"
#include "stdsys/ref.h"

typedef struct struct_DBlockVector  DBlockVectorData, *DBlockVector;
typedef struct struct_DVector DVectorData,*DVector;

#include "vector/partition.h"

#define LuaBind
  LuaBind  typedef struct {} DVectorData;
  LuaBind  typedef struct {} DBlockVectorData;
  LuaBindSub(DVector, DVectorData*);
  LuaBindSub(DBlockVector, DBlockVectorData*);
  LuaBind   void release(DVector v);
  LuaBind   void release(DBlockVector  a);

#define dbv_UNKNOWN 0

LuaBind DBlockVector dbvCreate (int nrow, int ncol); 
 Create block vector with nrow rows  and ncol columns. 
 The size of a block vector is  adjusteable. 
 Notably, we can choose nrow=dbv_UNKNOWN in order
 to create an adjusteable array.

        DBlockVector dbvClone (DBlockVector a);
  Clone array. Return an array with the same number of rows,
  columns, and the same partition as a.

LuaBind     int dbvNCol   (DBlockVector a); /* number of columns n_c*/
LuaBind     int dbvNRow   (DBlockVector a); /* number of rows n_r*/
LuaBind     int dbvNAll   (DBlockVector a); /* n_r*n_c */
LuaBind    void dbvCheck  (DBlockVector a); /* check if bounds had been overwritten*/
LuaBind    void dbvAdjust (DBlockVector a); /* Adjust allocated space to actual size.*/

double* dbvColVal (DBlockVector a, int irow); /* data of column */
double* dbvRowVal (DBlockVector a, int icol); /* data of row */
double* dbvVal    (DBlockVector a);           /* data */
/* All dbv*Val routines return data in such a way that the first
   valid data item is stored at offset  1 so that C code can
   uses loops of type for (i=1;i<=n;i++) on it.

double* dbvColVal77 (DBlockVector a, int irow); /* data of column */
double* dbvRowVal77 (DBlockVector a, int icol); /* data of row */
double* dbvVal77    (DBlockVector a);           /* data */
/* All dbv*Val77 routines return data in such a way that the first
   valid data item is stored at offset 0 so that fortran code can
   use loops of type do i=1,n  on it.

Partition dbvGetPartition(DBlockVector a);
void dbvSetPartition(DBlockVector a, Partition ap);
/* Get/Set partition of a */

int * dbvParts(DBlockVector a);
int dbvNParts(DBlockVector a);

#ifndef BV
#define BV(a,i2,i1)    ((a)->val[(i2-1)*a->ncol+i1])
/*Access macro, can be used as lvalue */

int dbvLineHandler(DBlockVector  a, int iline, int argc, char *argv[]);
/* Line handler for file parsing: collect a full row */

LuaBind DVector dvCreate(int n);

Create vector  of length  n with stride  1. 
If n=dbv_UNKNOWN  then the vector becomes  of variable  length, 
i.e. any  index set  operation is accepted, and if necessary, 
the vector is prolonged.


DVector dvClone(DVector v);
   Clone vector v. If v is a vector with stride >1,
   the result will be  of stride 1.

Partition dvGetPartition(DVector a);
void dvSetPartition(DVector v, Partition ap);
/* Partition vector v */

int * dvParts(DVector a);
int dvNParts(DVector a);

LuaBind   void dvAdjust(DVector v);
/* Adjust physical length (allocated memory) 
   to actual length, after the call, no change
   of length is possible anymore.

LuaBind   int dvN(DVector v); /* Get Vector Length */
          int dvStride(DVector v); /* Get storage stride */

LuaBind   double dvGeti(DVector v,int i);  
LuaBind   void  dvSeti(DVector v, int i, double val); 
/* Get/Set value at index i, adjust length if necessary. */

#ifndef V
#define V(v,i)    ((v)->val[((i)-1)*v->stride+1])
/*Access macro, can be used as lvalue */

double *dvVal(DVector v);
  Return pointer to data array:
  | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ...   
  such that if v=dVal(vec), in the case of stride 1
  dvGeti(vec,i) and v[i] are equivalent (counting from one).

double *dvVal77(DVector v);

LuaBind   void dvCheck(DVector v); 
/* Check memory bounds */

LuaBind   void dvPrint(DVector v);
/* Print contents */

LuaBind DVector dbvRow(DBlockVector a, int irow);
  Create a stride 1 vector of lentgth ncol(a) containing row irow  of a 
LuaBind DVector dbvCol(DBlockVector a, int icol);
  Create a stride ncol(a) vector of length nrow(a) contaning column icol

LuaBind DVector dbvAll(DBlockVector a);
  Create a stride 1 vector of length ncol(a)*nrow(a) containing
  all the data of a.

int dvLineHandler(DVector v , int iline, int argc, char *argv[]);


typedef struct struct_DMassif DMassifData,*DMassif;
/* A massif is the actual vecto data container. Russian programmers
   often say "massif" when they mean an array.  Why shouldn't
   we say it too -- at least this name gives the feeling of
   something huge. This is our intention.
#ifdef PDELIB
#include "grid/grid.h"

struct struct_DMassif
  double *val;
  int nrow;
  int ncol;
  int nalloc;
  Partition partition;

#ifdef PDELIB
  Grid      grid; /* Pointer to grid */   
  gAtomType type; /* TODO to be replaced by stencil */
  int refcount;
  void (*destroy)(DMassif m);

struct struct_DBlockVector
  double *val;
  DMassif data;
  int nrow;
  int ncol;
  int refcount;
  void (*destroy)(DBlockVector a);

struct struct_DVector
  double *val;
  DMassif data;
  int n;
  int stride;
  int refcount;
  void (*destroy)(DVector v);

#undef LuaBind