Function luaL_checknumber

third-party/lua-5.2.4/src/lauxlib.c:375–381

LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
  int isnum;
  lua_Number d = lua_tonumberx(L, narg, &isnum);
  if (!isnum)
    tag_error(L, narg, LUA_TNUMBER);
  return d;
}


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