bit array in C++

[hondya]

The following piece of code compiles under C (gcc 3.4.2)

typedef struct {
unsigned int padding[16]:1;
unsigned int holes[16]:1;
} triangle_bitmap _t;

However I get the error "invalid member function declaration" when I
try to compile it with C++ compiler (g++ 3.4.2). Any idea what might I
be doing wrong.

[Ron Natalie]

Re: bit array in C++

hondya wrote:[color=blue]
> The following piece of code compiles under C (gcc 3.4.2)
>
> typedef struct {
> unsigned int padding[16]:1;
> unsigned int holes[16]:1;
> } triangle_bitmap _t;
>
> However I get the error "invalid member function declaration" when I
> try to compile it with C++ compiler (g++ 3.4.2). Any idea what might I
> be doing wrong.
>[/color]
The error is a bit obtuse, but there is no such thing as a bit array.
A bitfield identifier must either be applied directly to the identifier
name or be an unnamed one. You can't apply it to an array .

[hondya]

Re: bit array in C++

Is it a C++ limitation/bug? Because the same thing works in C.

[Neelesh Bodas]

Re: bit array in C++


hondya wrote:[color=blue]
> Is it a C++ limitation/bug?[/color]
No, its a syntax error. Bitfields cannot be applied for arrays.

[color=blue][color=green]
>> the same thing works in C.[/color][/color]

C is not C++ and C++ is not C.

[Default User]

Re: bit array in C++

hondya wrote:
[color=blue]
> Is it a C++ limitation/bug? Because the same thing works in C.[/color]

It's illegal in C as well. If your C compiler allowed, then it is some
sort of extension.



Brian

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[Paweł]

Re: bit array in C++

hondya wrote:
[color=blue]
> The following piece of code compiles under C (gcc 3.4.2)[/color]

gcc 3.4.5 reject this code with error: bit-field `...' has invalid type.