Function validop

ThirdParty/lua/lua/lcode.c:749–760

** return false if folding can raise an error */

** return false if folding can raise an error
*/
static int validop (int op, TValue *v1, TValue *v2) {
  switch (op) {
    case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
    case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: {  /* conversion errors */
      lua_Integer i;
      return (tointeger(v1, &i) && tointeger(v2, &i));
    }
    case LUA_OPDIV: case LUA_OPIDIV: case LUA_OPMOD:  /* division by 0 */
      return (nvalue(v2) != 0);
    default: return 1;  /* everything else is valid */
  }
}


/*