Re: Is there a C API that could exchange the values at different index of the stack?

[Francisco Olarte <folarte@...>]

Sunshi...

On Fri, Jan 22, 2021 at 8:43 AM 孙世龙 sunshilong <sunshilong369@gmail.com> wrote:
> Is there a C API that could exchange the values at different index of the stack?
> For example:
> index j is "hello" , index i is 100
> invoke a specific API,
> index j is 100,  index i is "hello"

I think not, but you can easily do something like....
int lua_swapvalues(lua_State * L, int i, int j) {
   i = lua_absindex(L, i);
   j = lua_absindex(L, j);  /* In case either of them is negative. */
   if (i!=j) {
      if (!lua_checkstack(L,2))   return 0; /* Out of memory */
      lua_pushvalue(L,i);
      lua_pushvalue(L,j);
      lua_replace(L, i);
      lua_replace(L,j);
   }
   return 1;
}

FOS