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October 26, 2012 Compiling shared example. | ||||
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To learn about shared attribute I've copied nearly verbatim an example from Andreis book. The code: import core.atomic; struct Data{ int value; } shared struct SharedStack(T) { private shared struct Node{ T data; Node* next; this(T value){data = value;}; } private Node* root; // push void push(T value){ auto n = new Node(value); shared(Node)* oldRoot; do { oldRoot = root; n.next = oldRoot; } while(!cas(&root,oldRoot,n)); // line 30 } // ... } SharedStack!(Data) q; void main(string[] args){ Data m; q.push(m); // line 40 } I got the following error (dmd 2.060 win): (40) Error function main.SharedStack!(Data).SharedStack.push(Data value) shared is not callable using argument types (Data) (30) template core.atomic.cas does not match any function template declaration What is wrong here ? Peter |
October 28, 2012 Re: Compiling shared example. | ||||
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Posted in reply to Peter Sommerfeld | On 10/26/2012 02:22 PM, Peter Sommerfeld wrote:
> To learn about shared attribute I've copied nearly verbatim an
> example from Andreis book. The code:
>
> import core.atomic;
>
> struct Data{
> int value;
> }
>
> shared struct SharedStack(T) {
>
> private shared struct Node{
> T data;
> Node* next;
> this(T value){data = value;};
> }
> private Node* root;
>
> // push
>
> void push(T value){
> auto n = new Node(value);
> shared(Node)* oldRoot;
> do {
> oldRoot = root;
> n.next = oldRoot;
> } while(!cas(&root,oldRoot,n)); // line 30
> }
> // ...
> }
>
> SharedStack!(Data) q;
>
> void main(string[] args){
>
> Data m;
> q.push(m); // line 40
> }
>
> I got the following error (dmd 2.060 win):
>
> (40) Error function main.SharedStack!(Data).SharedStack.push(Data value)
> shared is not callable using argument types (Data)
>
> (30) template core.atomic.cas does not match any function template
> declaration
>
> What is wrong here ?
>
> Peter
The following two changes are the workaround at least for compilation:
auto n = cast(shared)new Node(value);
// ...
shared SharedStack!(Data) q;
Ali
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October 28, 2012 Re: Compiling shared example. | ||||
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Posted in reply to Ali Çehreli | Am 28.10.2012, 08:06 Uhr, schrieb Ali Çehreli <acehreli@yahoo.com>:
> On 10/26/2012 02:22 PM, Peter Sommerfeld wrote:
>> To learn about shared attribute I've copied nearly verbatim an
>> example from Andreis book. The code:
>>
>> import core.atomic;
>>
>> struct Data{
>> int value;
>> }
>>
>> shared struct SharedStack(T) {
>>
>> private shared struct Node{
>> T data;
>> Node* next;
>> this(T value){data = value;};
>> }
>> private Node* root;
>>
>> // push
>>
>> void push(T value){
>> auto n = new Node(value);
>> shared(Node)* oldRoot;
>> do {
>> oldRoot = root;
>> n.next = oldRoot;
>> } while(!cas(&root,oldRoot,n)); // line 30
>> }
>> // ...
>> }
>>
>> SharedStack!(Data) q;
>>
>> void main(string[] args){
>>
>> Data m;
>> q.push(m); // line 40
>> }
>>
>> I got the following error (dmd 2.060 win):
>>
>> (40) Error function main.SharedStack!(Data).SharedStack.push(Data value)
>> shared is not callable using argument types (Data)
>>
>> (30) template core.atomic.cas does not match any function template
>> declaration
>>
>> What is wrong here ?
>>
>> Peter
>
> The following two changes are the workaround at least for compilation:
>
> auto n = cast(shared)new Node(value);
> // ...
>
> shared SharedStack!(Data) q;
>
> Ali
Thanks Ali, that keeps me going for now. But I wonder why I
have do declare the variables shared if the data are declared
to be shared. Is that a shortcoming of the current compiler ?
Anyway, I can continue ...
BTW: Thanks for your book! It is of great help for beginners
like me!
Peter
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October 29, 2012 Re: Compiling shared example. | ||||
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Posted in reply to Peter Sommerfeld | On 10/28/2012 02:46 AM, Peter Sommerfeld wrote: > But I wonder why I > have do declare the variables shared if the data are declared > to be shared. Is that a shortcoming of the current compiler ? I had to look this one up. According to the spec, a shared struct does not mean that the variables of that struct are automatically shared. It means that the members of the struct are shared: http://dlang.org/struct.html#ConstStruct Here is a test: import std.stdio; shared struct S { int i; int[] a; } void main() { auto s = S(); writeln(typeid(s)); writeln(typeid(s.i)); writeln(typeid(s.a)); } According to the output, the members are shared, not the struct: deneme.S shared(int) shared(shared(int)[]) > BTW: Thanks for your book! It is of great help for beginners > like me! > > Peter Thank you very much. It is really great to hear. :) Ali -- D Programming Language Tutorial: http://ddili.org/ders/d.en/index.html |
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