hello, I'm in a bit of a rut here with D. What I want to do is pass a pointer to a function and have that function change it's value. For example, in C you can use

function(int *bob)
{
bob = 6;
}

main()
{
int bob = 7;
function(&bob);
// bob now equals 6
}

I've tried this in D, but D doesn't have the & keyword and D segfaults when I try to change the value of a declared pointer. Like if i do

int *bob; *bob = 7;

i get a segmentation fault probably due to D's garbage collector or something. anyways, all I'm asking is what is the D equivilent of pointers that you can pass to functions and change their value? thanks.

void function (inout int bob) ...

then you don't need to dereference.


clayasaurus wrote:
> hello, I'm in a bit of a rut here with D. What I want to do is pass a pointer to
> a function and have that function change it's value. For example, in C you can
> use
> 
> function(int *bob)
> {
> bob = 6; }
> 
> main()
> {
> int bob = 7;
> function(&bob);
> // bob now equals 6
> }
> 
> I've tried this in D, but D doesn't have the & keyword and D segfaults when I
> try to change the value of a declared pointer. Like if i do
> 
> int *bob; *bob = 7; 
> 
> i get a segmentation fault probably due to D's garbage collector or something.
> anyways, all I'm asking is what is the D equivilent of pointers that you can
> pass to functions and change their value? thanks. 
> 
> 

In article <c836e1$19cn$1@digitaldaemon.com>, Daniel Horn says...
>
>void function (inout int bob) ...
>
>then you don't need to dereference.
>
>

wow, that's pretty sweet & simple. D is awesome.

"clayasaurus" <clayasaurus_member@pathlink.com> wrote in message news:c835qs$18ji$1@digitaldaemon.com...
> hello, I'm in a bit of a rut here with D. What I want to do is pass a
pointer to
> a function and have that function change it's value. For example, in C you
can
> use
>
> function(int *bob)
> {
> bob = 6;
> }
>
> main()
> {
> int bob = 7;
> function(&bob);
> // bob now equals 6
> }
>
> I've tried this in D, but D doesn't have the & keyword and D segfaults
when I
> try to change the value of a declared pointer. Like if i do

D does have C's & operator. You must specify a return type in functions, and the word 'function' is a keyword. This works:

void func(int *bob)
{
*bob = 6;
}

int main()
{
int bob = 7;
func(&bob);
// bob now equals 6
return 0;
}


>
> int *bob;
> *bob = 7;
>
> i get a segmentation fault probably due to D's garbage collector or
something.
> anyways, all I'm asking is what is the D equivilent of pointers that you
can
> pass to functions and change their value? thanks.

This will most likely not work in C either; and it's better off not working because if it does work, it'll just end up corrupting something. bob must point somewhere:

int foo;
int *bob = &foo; // or use 'new', etc.
*bob = 7;


--
Christopher E. Miller