I have the following:

void foo(...)
{
  void* argptr = _argptr;
  foreach(TypeInfo ti; _arguments)
  {  if(ti == typeid(char[]))
     { /* do something */
       argptr += (char[]).sizeof;}
     else if(ti == typeid(sometype))
     { /* do something else */
       argptr += (sometype).sizeof;}
  }
  /+
  At this point the pointer should be pointing
  just beyond the last argument. My question
  question is how do I get it back to where it
  was when I initially entered this function?

  I have tried decrementing the pointer with:
     foreach(TypeInfo ti; _arguments)
       if(ti == typeid(sometype))
         argptr -= sometype.sizeof;
  but that doesn't help at all.
  +/
}

thanks for your assistance.
Andrew

On Tue, 21 Dec 2004 06:24:54 -0500, Tyro <ridimz_at@yahoo.dot.com> wrote:

> I have the following:
>
> void foo(...)
> {
>    void* argptr = _argptr;
>    foreach(TypeInfo ti; _arguments)
>    {  if(ti == typeid(char[]))
>       { /* do something */
>         argptr += (char[]).sizeof;}
>       else if(ti == typeid(sometype))
>       { /* do something else */
>         argptr += (sometype).sizeof;}
>    }
>    /+
>    At this point the pointer should be pointing
>    just beyond the last argument. My question
>    question is how do I get it back to where it
>    was when I initially entered this function?
>
>    I have tried decrementing the pointer with:
>       foreach(TypeInfo ti; _arguments)
>         if(ti == typeid(sometype))
>           argptr -= sometype.sizeof;
>    but that doesn't help at all.
>    +/
> }
>
> thanks for your assistance.
> Andrew

whats wrong with argptr = _argptr again?

-- 
"Unhappy Microsoft customers have a funny way of becoming Linux,
Salesforce.com and Oracle customers." - www.microsoft-watch.com:
"The Year in Review: Microsoft Opens Up"
--
"I plan on at least one critical patch every month, and I haven't been disappointed."
- Adam Hansen, manager of security at Sonnenschein Nath & Rosenthal LLP
(Quote from http://www.eweek.com/article2/0,1759,1736104,00.asp)
--
"It's been a challenge to "reteach or retrain" Web users to pay for content, said Pizey"
-Wired website: "The Incredible Shrinking Comic"

Simon Buchan wrote:
> On Tue, 21 Dec 2004 06:24:54 -0500, Tyro <ridimz_at@yahoo.dot.com> wrote:
> 
>> I have the following:
>>
>> void foo(...)
>> {
>>    void* argptr = _argptr;
>>    foreach(TypeInfo ti; _arguments)
>>    {  if(ti == typeid(char[]))
>>       { /* do something */
>>         argptr += (char[]).sizeof;}
>>       else if(ti == typeid(sometype))
>>       { /* do something else */
>>         argptr += (sometype).sizeof;}
>>    }
>>    /+
>>    At this point the pointer should be pointing
>>    just beyond the last argument. My question
>>    question is how do I get it back to where it
>>    was when I initially entered this function?
>>
>>    I have tried decrementing the pointer with:
>>       foreach(TypeInfo ti; _arguments)
>>         if(ti == typeid(sometype))
>>           argptr -= sometype.sizeof;
>>    but that doesn't help at all.
>>    +/
>> }
>>
>> thanks for your assistance.
>> Andrew
> 
> 
> whats wrong with argptr = _argptr again?
> 

With every incrementation, I have modified argptr.
Therefore, simply assigning it the values of _argptr
will destroy the new values I've just assigned it.

I want to get back to the beginning of argptr which
now contains the new values I inserted.

On Tue, 21 Dec 2004 06:46:04 -0500, Tyro <ridimz_at@yahoo.dot.com> wrote:

> Simon Buchan wrote:
>> On Tue, 21 Dec 2004 06:24:54 -0500, Tyro <ridimz_at@yahoo.dot.com> wrote:
>>
<snip>
>>   whats wrong with argptr = _argptr again?
>>
>
> With every incrementation, I have modified argptr.
> Therefore, simply assigning it the values of _argptr
> will destroy the new values I've just assigned it.
>
> I want to get back to the beginning of argptr which
> now contains the new values I inserted.

Hmm, I don't get it... how can you assign values to a void*, then
want to move it back to the start? The ONLY information a void* holds
is its location, by definition.

Is what you want to create a new void* with the values of the args
memcpy'ed after it?

-- 
"Unhappy Microsoft customers have a funny way of becoming Linux,
Salesforce.com and Oracle customers." - www.microsoft-watch.com:
"The Year in Review: Microsoft Opens Up"
--
"I plan on at least one critical patch every month, and I haven't been disappointed."
- Adam Hansen, manager of security at Sonnenschein Nath & Rosenthal LLP
(Quote from http://www.eweek.com/article2/0,1759,1736104,00.asp)
--
"It's been a challenge to "reteach or retrain" Web users to pay for content, said Pizey"
-Wired website: "The Incredible Shrinking Comic"

In article <cq92dt$2noi$1@digitaldaemon.com>, Tyro says...
>
>Simon Buchan wrote:
>> On Tue, 21 Dec 2004 06:24:54 -0500, Tyro <ridimz_at@yahoo.dot.com> wrote:
>> 
>>> I have the following:
>>>
>>> void foo(...)
>>> {
>>>    void* argptr = _argptr;
>>>    foreach(TypeInfo ti; _arguments)
>>>    {  if(ti == typeid(char[]))
>>>       { /* do something */
>>>         argptr += (char[]).sizeof;}
>>>       else if(ti == typeid(sometype))
>>>       { /* do something else */
>>>         argptr += (sometype).sizeof;}
>>>    }
>>>    /+
>>>    At this point the pointer should be pointing
>>>    just beyond the last argument. My question
>>>    question is how do I get it back to where it
>>>    was when I initially entered this function?
>>>
>>>    I have tried decrementing the pointer with:
>>>       foreach(TypeInfo ti; _arguments)
>>>         if(ti == typeid(sometype))
>>>           argptr -= sometype.sizeof;
>>>    but that doesn't help at all.
>>>    +/
>>> }
>>>
>>> thanks for your assistance.
>>> Andrew
>> 
>> 
>> whats wrong with argptr = _argptr again?
>> 
>
>With every incrementation, I have modified argptr.
>Therefore, simply assigning it the values of _argptr
>will destroy the new values I've just assigned it.
>
>I want to get back to the beginning of argptr which
>now contains the new values I inserted.

This really looks like using a wrench where
a hammer should be used. (Or the other way 'round.)

Instead of answering your question, maybe we should try
to find out _what_ and _why_ you are trying to do?

For example, if you want to change the strings, why
don't you copy them into another array?