Function luaL_checknumber

Source/Misc/lua/src/lua.c:10388–10393

LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
lua_Number d = lua_tonumber(L, narg);
if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
tag_error(L, narg, LUA_TNUMBER);
return d;
}


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