Get list of C structure members

Question

Is it possible to get the list of members of a structure as a char ** ?

For example, something like this:

struct mystruct {
    int x;
          


        

Answer 1

Take a look at Metaresc library https://github.com/alexanderchuranov/Metaresc

It provides interface for types declaration that will also generate meta-data for the type. Based on meta-data you can easily serialize/deserialize objects of any complexity. Out of the box you can serialize/deserialize XML, JSON, XDR, Lisp-like notation, C-init notation.

Here is a simple example:

#include 
#include 

#include "metaresc.h"

TYPEDEF_STRUCT (sample_t,
                int x,
                float y,
                string_t z
                );

int main (int argc, char * argv[])
{
  mr_td_t * tdp = mr_get_td_by_name ("sample_t");

  if (tdp)
    {
      int i;
      for (i = 0; i < tdp->fields_size / sizeof (tdp->fields[0]); ++i)
        printf ("offset [%zd] size %zd field '%s'\n",
                tdp->fields[i].fdp->offset,
                tdp->fields[i].fdp->size,
                tdp->fields[i].fdp->name.str,
                tdp->fields[i].fdp->type);
    }
  return (EXIT_SUCCESS);
}

This program will output

$ ./struct
offset [0] size 4 field 'x' type 'int'
offset [4] size 4 field 'y' type 'float'
offset [8] size 8 field 'z' type 'string_t'

Library works fine for latest gcc and clang.