Re: C API question - modifing table

[Michael Roth <mroth@...>]

Dmitry Samersoff wrote:

> lua_tostring remove value from stack. Isn't it ?
> So I should just push a key back late.

No! lua_toxxx don't remove (pop) the value from the stack!

> Your code works, but unfortunately problem still exists.
> I can add my key to table before  I iterated throuph it, but not after it.
>
> i.e
>  lua_pushstring(L, "RRN");
>  lua_pushstring(L, "abcd");
>  lua_settable(L,-3);
>
> works fine before loop but doesn't work after it.

My sample loop fills the stack with key value pairs because I thought 
you would like to. If you don't need this, you could write the loop much 
easier:

      lua_pushnil(L);
      while (lua_next(L, t))
      {
        lua_pushvalue(L, -2); /* make copy of key */
        const char *key = lua_tostring(L, -1); /* note index! (copy) */
        const char *val = lua_tostring(L, -2);
        cerr << "Key: " << key << " Val:" << val << endl;
        lua_pop(L, 2); /* pops value and copy of key */
      }

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