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error zero-sized struct/union Ancona, Illinois

Is the NHS wrong about passwords? "Rollbacked" or "rolled back" the edit? Apr 20, 2012 at 6:31pm UTC clanmjc (666) warning C4200: nonstandard extension used : zero-sized array in struct/union Cannot generate copy-ctor or copy-assignment operator when UDT contains a zero-sized array I I used them under GCC, so they must be relatively common if GCC and VC++ support them. Another interesting property is that in g++ this seems to be the only way to create a member that really has zero size. (sizeof an empty struct always seems to yield

We always allow them in system headers because glibc uses them. */ Maybe the C++ front-end could be made stricter, so that it accepts char b[0] (like the C front end) Comment 6 David Resnick 2009-11-23 14:15:04 UTC (In reply to comment #5) > Subject: Re: g++ should warn or error on internal 0 size > array in struct > On Fri, Variadic functions and non-POD arguments auto_ptr and their usability with STL containers Koenig look-up and namespaces Casting cv-qualifier and function pointers to void* Kick-off: Learning C++ My Other blogs Abnegator's reflections I've fixed this in master now.

How to detect showListButton/hideListButton being clicked on collapsible PageBlockSection? Comment 7 Jonathan Wakely 2009-11-23 14:53:06 UTC (In reply to comment #6) > > OK, can't argue with not breaking existing headers I suppose. Regards, Paul McKenzie Reply With Quote Quick Navigation C++ (Non Visual C++ Issues) Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Visual C++ & C++ Seems like there is no possible use in an internal member, and not diagnosing this as warnable means you don't notice if, say, someone accidentally adds something after the flexible array

Compiler Warning (levels 2 and 4) C4200 Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 Apr 20, 2012 at 8:08pm UTC utikawa (3) That's a very good idea! :-) I will create a macro to calculate remaining size. This kind of approach relies on the fact that there is no bounds checking on C arrays. Top Owen Post subject: Re: struct has an illegal zero-sized arrayPosted: Tue Oct 12, 2010 6:46 am Member Joined: Fri Jun 13, 2008 3:21 pmPosts: 1700Location: Cambridge, United

Learn more about rsyslog professional services! Possible battery solutions for 1000mAh capacity and >10 year life? THe warning appears because of structures declared like this: #pragma pack( push ) #pragma pack( 1 ) // String struct MY_TREEDATSTR { BYTE btLen; DWORD dwModOff; BYTE btPat[0]; }; typedef MY_TREEDATSTR That is, std::vector implementation with VC++ might use this extension but they don't do so. :-)Interesting one, this one...

But > I'm curious what possible use a non-terminal zero sized array in a struct might > have. By having the two private you will get compile time errors if by mistake you try to use it in code. Last edited by nuzzle; September 10th, 2011 at 01:13 AM. I would appreciate any advice you might be able to give me!

The content you requested has been removed. Why would a password requirement prohibit a number in the last character? If this scenario applies to your code, you can disable the warning:Example C++ Copy // C4200b.cpp // compile by using: cl /W4 c4200a.cpp #pragma warning(disable : 4200) struct A { int nice..

Which happened to us, which is why I noticed this > > issue. Pragma pack is used to ask the compiler to leave no empty spaces between the fields (normally compilers do sometimes leave some unused bytes between fields of structres to guarantee alignment Always use the -mt option instead of listing -lthread explicitly. It should be possible to make the C++ front end stricter about these so that outside of system headers they are an error, downgradeable to a warning with -fpermissive.

Of course, this extension only makes sense if the extra data comes at the end of a top-level object, as otherwise we would be overwriting data at subsequent offsets. Sorry, I forgot to say one thing: the code should to be compiled for both C and C++ languages. E.g. What's the most recent specific historical element that is common between Star Trek and the real world?

It is a ModBUS protocol definition and I want to use the same file for both situations: firmware of my PLC (It is using an ARM Cortex-M3 processor ) and my None of this changes affects the memory layout of your objects. [*] The calculation for the size here is a bit off, and will overallocate, probably by as much as sizeof(int) Although allocating 0 sized arrays is allowed, does it create some error (heap memory overflow, etc)?I know that allocating 0 sized memory with malloc and copying something to that memory can This is equivalent to defining a new structure containing the original structure followed by an array of sufficient size to contain the data.

Apr 20, 2012 at 6:49pm UTC utikawa (3) Hi clanmjc! If however a struct contains a zero-sized array, the size of the struct will also be zero.So say you are writing a templated class and the user should be able to Please explain why you need to use an array instead of vector. Truth in numbers Did Sputnik 1 have attitude control?

Note however that there are architectures where unaligned access is not just slow... The integration process goes well and actually is almost finished (it compiles). Flexible array members may only appear as the last member of a struct that is otherwise non-empty. Since you are refactoring to C++, I would also make the default constructor private and provide a static public inlined method that will take care of the proper allocation of the

Seems like there is no > > possible use in an internal member, and not diagnosing this as warnable means > > you don't notice if, say, someone accidentally adds something In the case of omdiscard, this could beCode: Select alltypedef struct _instanceData {
int notNeededAtAll;
} instanceData;
which should solve the issue. See for details : Unsized arrays.The rationale as per msdn is saving the runtime pointer dereferences and that is not specific to C. May 27, 2009 at 9:19 PM Alexey Lebedev said...