Function luaL_checknumber

lua/lauxlib.c:213–220

LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
  if (lua_isnumber(L, narg))
    return lua_tonumber(L, narg);
  if (luabb_isnumber(L, narg))
    return luabb_tonumber(L, narg);
  tag_error(L, narg, LUA_TNUMBER);
  return 3.14; /* can't reach */
}


LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {