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From: jean-baptiste g. <jea...@la...> - 2015-12-13 13:13:13
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Well they are pretty usefull if you want to inherit from a c++ class. I'm making a game engine and these lua-class are awesome to add new Types to the engine :) On 12/12/2015 18:28, Michael Steinberg wrote: > Nevermind... I will try to reproduce later. > And I need to find out what's the use for having these lua-only > classes... :) > > 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 > > ------------------------------------------------------------------------------ > _______________________________________________ > luabind-user mailing list > lua...@li... > https://lists.sourceforge.net/lists/listinfo/luabind-user |
