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Error Cannot Bind Packed Field

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Log In "cannot bind packed field" errors in XCode 3 MacOSX and iOS stpope 2012-07-21 17:35:42 UTC #1 Hello all, I'm building JUCE 2.0 with XCode 3 (I know it's old, If you take into account that a reference is essentially a pointer (at least in the case of a function argument) this pointer could easily have the wrong alignment, because your Larry Laurence Harris Re: Alignment in structs Jul 15 2006, 01:41 On Jul 14, 2006, at 6:57 PM, Eric Albert wrote: > On Jul 14, 2006, at 3:49 PM, Laurence Harris his comment is here

Under gcc 3.3.3 (on Linux), there was no error. What's the purpose of passing a pointer as a reference parameter, anyway? The error message is, juce_PixelFormats.h:80: error: cannot bind packed field '((juce::PixelARGB*)this)->juce::PixelARGB::.juce::PixelARGB::::components.juce::PixelARGB::Components::a' to 'juce::uint8&' The line in question is, forcedinline uint8& getAlpha() noexcept { return components.a; } Has anyone else seen this? It is simply ignored by my gcc. –gexicide Dec 15 '14 at 19:32 @gexicide The "workaround" looks like a hack that avoids the error message but doesn't actually work. Homepage

However, I receive an error when trying to return a reference to a packed field. The simplest answer might be backwards compatibility. In the OP's case, the following code could violate the alignment requirements They suggest a workaround using alignment attribute to define your own aligned type but it does not look like Is this the intended behavior or not?

Nov 7, 2006 - 10:42 PM Fivestar widget 12345Total votes: 0 Hi, I get this error message when compiling attached file and same kind of code in my project with avr-gcc: StagiaireINA 2012-08-08 12:31:09 UTC #6 Hmm.. stp in Santa Barbara jules 2012-07-21 19:27:14 UTC #2 Ah, that's a PPC build then. Even if you plan to update the preferences to something more modern, such as a plist, you'd still want to be able to read the old preferences.

typedef struct Blah { UInt32 a : 32; UInt32 b : 32; UInt32 c : 32; SInt16 d : 16; } Blah; If you try Join them; it only takes a minute: Sign up Why can't I return a reference to a packed field? Mar 14, 2004 Posts: 10 View posts #4 Posted by totenhose: Wed. Do humans have an ethical obligation to prevent animal on animal violence?

Inequality caused by float inaccuracy Why is (a % 256) different than (a & 0xFF)? Jonathan Wakely wrote: A const-reference causes a temporary to be created, you didn't bind to the packed field The bottom line is that it's not a bug itself that you can't I just started my first real job, and have been asked to organize the office party. Nov 8, 2006 - 01:13 PM 12345Total votes: 0 Compiles without complaints here, both GCC 3.4.6 and 4.1.0.

up vote 2 down vote favorite 2 I encountered a problem, passing struct member to a template function. http://www.avrfreaks.net/forum/cannot-bind-packed-field-error It seems that read only > access of packed data members is fine, but write access through a > reference is not. Master alredy fixed, see #170.">plugin: param: Fix build error #237http://haywirerobotics.com/error-cannot/error-cannot-open-an-http-server-socket-error-reported-errno-eacces.html Inequality caused by float inaccuracy Total distance traveled when visiting all rational numbers Is it anti-pattern if a class property creates and returns a new instance of a class? I'm sure the C spec has similar language. Join them; it only takes a minute: Sign up Passing reference of packed struct member to template.

Eng Rogue Research www.rogue-research.com Mac Software Developer Thanks, >>>> >>>> >>>> Try this: >>>> >>>> typedef struct Blah { >>>> UInt32 a, b, c; >>>> SInt16 d; >>>> } __attribute__((__packed__)) Blah; >>> Thanks, >> >> Larry > > There's obviously some padding to keep the variable on the correct > memory alignment. weblink steve Rush Manbert Re: Alignment in structs Jul 17 2006, 21:59 Steve Christensen wrote: > On Jul 17, 2006, at 11:29 AM, Rush Manbert wrote: > >> Laurence Harris wrote: >>

Teenage daughter refusing to go to school How to grep two numbers from the same line at different places using bash? A reference is just like a pointer (with >> fewer capabilities) and wouldn't handle unaligned loads/stores. As you said __packed is not part of any standard.

Beddingfield 2009-10-11 04:38:27 UTC I have the same problem with g++ 4.2.4 and 4.3.2.

share|improve this answer edited Dec 15 '14 at 19:47 answered Dec 15 '14 at 19:21 Shafik Yaghmour 102k19235331 Don't believe this, just found the same bug report and was I don't >>> really understand why references are restricted in this way, but >>> I assume there's a good (if obscure) reason. >> Unaligned accesses can cause a crash on some Do you have a billion instances of Blah, so you need to save those 2 bytes? It only happens on the accessors that return a reference, and it happens even if I remove the packing directive from the components structure.

I took out the __attribute__((__packed__)) when I got the error. Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 41 Star 84 Fork 203 mavlink/mavros Code Issues 34 Pull requests 3 Projects If the calling argument is a pointer to UInt32, > that will be okay with the compiler too. check over here Should I allow my child to make an alternate meal if they do not like anything served at mealtime?

Thanks a lot! Thanks, > > Larry You could use a bitfield. GCC Bugzilla – Bug36566 Cannot bind packed field Last modified: 2015-03-18 01:55:54 UTC Home | New | Browse | Search | [?] | Reports | Help | NewAccount | Log In Web Sites: Disneyland vs Disney World in the United States copy multiple file in dired to clip and paste each one in a new line Draw a hollow square of #

You can test it by computing the difference between the address of the struct and the address of elem4, with and without packing the struct –Synxis Mar 30 '15 at 8:30 How to react?