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From: Michael S. <ms...@tu...> - 2015-12-12 17:50:56
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Is this pseudo-code or are you missing to specify a base class? Am 12.12.2015 um 15:10 schrieb jean-baptiste griffo: > This works for me too in such a case, but it fails if the object is a > luabind 'class' object, as in the OP message: > > class 'MyLuaClass' > function MyLuaClass:__init() end > > foo = MyLuaClass() > foo.bar = "baz"; > PrintAttributes(foo); > > > > On 12/12/2015 14:48, Pavel Kovalenko wrote: >> This example works for me (but I use another fork: >> https://github.com/decimad/luabind-deboostified) >> >> lua code: >> >> local obj = {} >> obj.foo = function (self) >> puts("obj:foo") >> end >> obj.data = 42 >> >> dump_object(obj) >> >> cpp code: >> >> void dump_object(const luabind::object &obj) >> { >> for (luabind::iterator it(obj), end; it!=end; it++) >> { >> auto s = object_cast<std::string>(it.key()); >> puts(s.c_str()); >> } >> } >> >> What kind of lua object are you trying to iterate over? >> On 12/12/2015 0:23 AM, jean-baptiste griffo wrote: >>> Hi, >>> >>> Well it's weird but I don't remember the exact fork I'm using, I think I >>> use this one >>> https://github.com/mrsharpoblunto/LHP/tree/master/luabind-0.7/include/luabind >>> I do not use the official release because I had some problems related to >>> size_t & x64 builds, and this fork solved it. >>> >>> Here is the c++ code, please note that at this point I'm 100% sure the >>> object on the stack is the "self" of my class instance >>> >>> //get the luabind object from the stack >>> luabind::object o(luabind::from_stack(L, lastIndex)); >>> >>> for (luabind::iterator i(o), end; i != end; ++i) >>> { >>> try >>> { >>> std::string strKey = luabind::object_cast<std::string>(i.key()); >>> printf("%s\n",strKey.c_str()); >>> } >>> catch(luabind::cast_failed & e) >>> { >>> printf("error\n"); >>> } >>> } >>> >>> ---------- >>> >>> As a result, it simply prints "error" indefinitely. >>> >>> Thanks. >>> >>> >>> On 11/12/2015 17:57, Pavel Kovalenko wrote: >>>> Hi, >>>> >>>> I don't have such problem (using luabind-deboostified fork). Could you >>>> show the code which causes an infinite loop? Which fork do you use? >>>> >>>> On 12/11/2015 3:00 PM, luabind-user-request@... wrote: >>>>> Send luabind-user mailing list submissions to >>>>> luabind-user@... >>>>> >>>>> To subscribe or unsubscribe via the World Wide Web, visit >>>>> https://lists.sourceforge.net/lists/listinfo/luabind-user >>>>> or, via email, send a message with subject or body 'help' to >>>>> luabind-user-request@... >>>>> >>>>> You can reach the person managing the list at >>>>> luabind-user-owner@... >>>>> >>>>> When replying, please edit your Subject line so it is more specific >>>>> than "Re: Contents of luabind-user digest..." >>>>> >>>>> >>>>> Today's Topics: >>>>> >>>>> 1. Re: How to get the attributes of a lua class without their >>>>> names, using luabind (Crashy) >>>>> >>>>> >>>>> ---------------------------------------------------------------------- >>>>> >>>>> Message: 1 >>>>> Date: Thu, 10 Dec 2015 05:07:38 -0700 (MST) >>>>> From: Crashy <jean-baptiste.griffo@...> >>>>> Subject: Re: [luabind] How to get the attributes of a lua class >>>>> without their names, using luabind >>>>> To: luabind-user@... >>>>> Message-ID: <1449749258848-7670726.post@...> >>>>> Content-Type: text/plain; charset=us-ascii >>>>> >>>>> Hi ! >>>>> >>>>> I hate to 'bump' very old topics, but I'm facing the same problem while >>>>> writing a lua debugger. >>>>> I can access values by name, but using the iterator results in an infinite >>>>> loop. >>>>> Iterators are doing well when the object is a simple table though, it only >>>>> fails when the object is a luabind class. >>>>> >>>>> Does anybody has a solution to iterate over member variables of a luabind >>>>> class ? >>>>> >>>>> Thanks ! >>>>> >>>>> >>>>> Thibault Ehrhart wrote >>>>>> Hello everyone, >>>>>> >>>>>> I have a Lua class (defined using luabind's 'class' keyword) and I'd like >>>>>> to get the value of the attributes defined in Lua, with C++. >>>>>> >>>>>> In the code below, I've defined a class, created an instance "foo" and set >>>>>> a custom attribute "bar" to that instance. Finally, I am calling a C++ >>>>>> function which has to print the attributes of the instance passed as a >>>>>> parameter. >>>>>> >>>>>> Here's the Lua code : >>>>>> >>>>>> class 'MyLuaClass' >>>>>> function MyLuaClass:__init() end >>>>>> >>>>>> foo = MyLuaClass() >>>>>> foo.bar = "baz"; >>>>>> PrintAttributes(foo); >>>>>> >>>>>> And now the C++ code of the PrintAttributes function, obj is a class >>>>>> instance: >>>>>> >>>>>> void PrintAttributes(luabind::object &obj) >>>>>> { >>>>>> // Direct access works >>>>>> std::cout << obj["bar"] << std::endl; // Will print "baz" :-) >>>>>> >>>>>> // But what if I don't know the name of the variable(s)? >>>>>> for (luabind::iterator it(obj); it != luabind::iterator(); ++it) >>>>>> { >>>>>> // Doesn't work since obj is an userdata >>>>>> } >>>>>> } >>>>>> >>>>>> I've also tried to use class_info but it only works with properties >>>>>> defined >>>>>> in a C++ class. Is there a way to access those defined with Lua? >>>>>> >>>>>> Regards, >>>>> >>>>> >>>>> -- >>>>> View this message in context: http://lua.2524044.n2.nabble.com/How-to-get-the-attributes-of-a-lua-class-without-their-names-using-luabind-tp7654070p7670726.html >>>>> Sent from the Lua C++ Bind mailing list archive at Nabble.com. >>>>> >>>>> >>>>> >>>>> ------------------------------ >>>>> >>>>> ------------------------------------------------------------------------------ >>>>> >>>>> >>>>> ------------------------------ >>>>> >>>>> _______________________________________________ >>>>> luabind-user mailing list >>>>> luabind-user@... >>>>> https://lists.sourceforge.net/lists/listinfo/luabind-user >>>>> >>>>> >>>>> End of luabind-user Digest, Vol 94, Issue 1 >>>>> ******************************************* >>>>> >>>>> > > ------------------------------------------------------------------------------ > _______________________________________________ > luabind-user mailing list > lua...@li... > https://lists.sourceforge.net/lists/listinfo/luabind-user |
