Re: [GD-General] Offset a void pointer

[Dan T. <da...@ar...>]

Is there any problem with:

BufferPtr = (char*)BufferPtr + stride;

? Compiles for me... certainly easier to read than (char*&)BufferPtr. Is 
one subtly faster than the in a way I'm not aware?

-Dan


Richard Fabian wrote:

>just add an ampersand to your cast to make it a reference pointer not
>just a pointer
>
>void *BufferPtr;
>unnsigned int stride=5;
>// should now compile
>(char*&)BufferPtr+=stride;
>
>
>On Tue, 12 Oct 2004 14:17:14 +0200, CAVEY GERARD <ger...@sg...> wrote:
>  
>
>>Hi
>>
>>I have little question
>>It seems impossible to me to offset a void pointer with the += operator
>>can someone explain me why ?
>>I don t really understand the compiler here ... the left casting should
>>give him the memory unit size , right?Is left casting forbidden?
>>
>>void *BufferPtr;
>>unnsigned int stridde=5;
>>//doesnt compile !
>>(char*)BufferPtr+=stride;
>>//will compile
>>BufferPtr=(char*)BufferPtr+stride;
>>
>>Thanks
>>GC.
>>
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