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Cannot Bind Packed Field

Thanks, > > Try this: > > typedef struct Blah { > UInt32 a, b, c; > SInt16 d; > } __attribute__((__packed__)) Blah; When I 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. stpope 2012-07-21 23:23:29 UTC #3 Mille grazie! Then I put it back and was going to use your >>> suggestion, but I don't get the error now. this contact form

stp StagiaireINA 2012-08-08 10:33:15 UTC #4 Hello, I've just upgraded my JUCE Version to 2.0.24, and I know get that error when I try to build projects that were fine before. Is "she don't" sometimes considered correct form? See: PR>> http://www.comnets.rwth-aachen.de/doc/c++std/decl.html#dcl.init.ref PR> PR>The above URL doesn't say anything about packed fields. On less forgiving hardware platforms, trying to use `pit' will result in illegal instruction exceptions. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36566

Yes, of course. However, I receive an error when trying to return a reference to a packed field. Making a large file using the terminal Does every interesting photograph have a story to tell? It seems that read >>> only access of packed data members is fine, but write access >>> through a reference is not.

Join them; it only takes a minute: Sign up Why can't I return a reference to a packed field? This is free software; see the source for copying conditions. Description Nevin Liber 2008-06-18 18:28:05 UTC If I have a packed struct and try to pass a member variable by reference to a function call, I get the "error: cannot bind what was I going to say again?

I can only add to this the corresponding quote from C++14 standard ([basic.align]/1): Object types have alignment requirements (3.9.1, 3.9.2) which place restrictions on the addresses at which an object of So I've tried to use the GIT command but the connection is refused on this computer. The hardware memory access is the same in either case. http://stackoverflow.com/questions/29340160/passing-reference-of-packed-struct-member-to-template-gcc-bug What did John Templeton mean when he said that the four most dangerous words in investing are: ‘this time it’s different'?

What happened is that I've built JUCE to go from JUCE 2.0.21 to 2.0.24. I took out the __attribute__((__packed__)) when I > got the error. Join them; it only takes a minute: Sign up Passing reference of packed struct member to template. I run into the same issue with gcc 4.6.x Comment 6 Gabriel M.

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 On x86/x86_64 it's *usually* no big deal because the CPU will gracefully handle unaligned memory access (with a performance penalty). Annoying to have on all the time, but useful if you're switching compilers I guess. -- ____________________________________________________________ Sean McBride, B. Is this the intended behavior or not?

I'd avoid packing your struct if at >> all possible or doing: >> >> Blah data = { 1, 2, 3, 4 }; >> UInt32 a = data.a; >> err = weblink Browse other questions tagged c++ g++ or ask your own question. The nth numerator How to deal with a coworker that writes software to give him job security instead of solving problems? Comment 2 Nevin Liber 2008-06-18 18:49:11 UTC Why is this an error (I couldn't find anything in the documentation)?

I know what's going on, but this padding will break compatibility with files that don't use the padded version. John Sean McBride Re: Alignment in structs Jul 17 2006, 17:16 On 2006-07-14 19:41, Laurence Harris said: >> #pragma pack(2) >> >> typedef struct Blah { >> UInt32 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 navigate here Here is code which demonstrates the issue: struct Squeeze { short s; } __attribute__((aligned(1), packed)); void VerticallyChallenged(short&) {} int main() { Squeeze oj; short& pit(oj.s); VerticallyChallenged(pit); // okay VerticallyChallenged(oj.s); // cannot

Now I get the following errors: Cannot bind packed field '((juce::PixelARGB*)this)->juce::PixelARGB::.juce::PixelARGB::::components.juce::PixelARGB::Components::a' to 'juce::uint8&' Once I've seen you telling me that those errors are supposed to be fixed, I've tried to run Are you sending Blahs over the wire to a remote location using some custom protocol? If the calling argument is a pointer to UInt32, > that will be okay with the compiler too.

The compilation error is: PR>> > PR>> > pavlin at carp[14] g++34 test.cc PR>> > test.cc: In function `int main()': PR>> > test.cc:22: error: cannot bind packed field `f1.foo::f' to `int&'

pointer) that violates the alignment requirements of short (which usually requires 2-byte alignment). What is really curved, spacetime, or simply the coordinate lines? Then I put it back and was going to use >>>> your suggestion, but I don't get the error now. Not the answer you're looking for?

Can a countable number of intersections of subsets or their complements be the null set? Find the function given its Fourier series what are 'hacker fares' at a flight search-engine? The compiler should either allow or disallow both. http://electrictricycle.net/cannot-bind/cannot-bind-to-map.html Then I've tried to compile an old project that was fine just before.

Thanks, >>>> >>>> >>>> Try this: >>>> >>>> typedef struct Blah { >>>> UInt32 a, b, c; >>>> SInt16 d; >>>> } __attribute__((__packed__)) Blah; >>> Already have an account? Browse other questions tagged c++ struct reference or ask your own question. Now, would I see padding issues with this as well: typedef struct Blah { SInt16 d; UInt32 a, b, c; } Blah; Larry Eric Albert Re: Alignment in structs Jul 15

StagiaireINA 2012-08-08 13:48:38 UTC #10 Well I might not surprise you, but you were right Home Categories FAQ/Guidelines Terms of Service Privacy Policy Powered by Discourse, best viewed with JavaScript enabled Google gives some mailing-list topics where dudes try to use "__attribute__ ((packed))" params, but in this case, there isn't such things. What is the definition of "rare language"?