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December 29, 2011
cas function issue
Hi folks,

I've got this very simple program, for which I keep getting compiler errors at the 'cas' function call.

import
	std.stdio,
	core.atomic;

class Int
{
public:
	this(int v) {
		this._v = v;
	}

private:
	int _v;
}


void main()
{
	shared(Int) a = new shared(Int)(10);
	shared(Int) b = new shared(Int)(20);
	shared(Int*) p = &a;

	if ( cas(p, a, b) ) {
		writeln("Swap OK");
	}
}

The errors are:

Error: template core.atomic.cas(T,V1,V2) if (__traits(compiles,mixin("*here = writeThis"))) does not match any
function template declaration

Error: template core.atomic.cas(T,V1,V2) if (__traits(compiles,mixin("*here = writeThis"))) cannot deduce template
function from argument types !()(shared(Int*),shared(Int),shared(Int))

Is it not possible to compare and swap object references in the cas function call?
Would someone kindly tell me as to what I am doing wrong?

Thanks.
- Adrian.
December 29, 2011
Re: cas function issue
On Thu, 29 Dec 2011 08:01:51 +0000, Adrian Mercieca wrote:

> Hi folks,
> 
> I've got this very simple program, for which I keep getting compiler
> errors at the 'cas' function call.
> 
> import
> 	std.stdio,
> 	core.atomic;
> 
> class Int
> {
> public:
> 	this(int v) {
> 		this._v = v;
> 	}
> 
> private:
> 	int _v;
> }
> 
> 
> void main()
> {
> 	shared(Int) a = new shared(Int)(10);
> 	shared(Int) b = new shared(Int)(20);
> 	shared(Int*) p = &a;
> 
> 	if ( cas(p, a, b) ) {
> 		writeln("Swap OK");
> 	}
> }
> 
> The errors are:
> 
> Error: template core.atomic.cas(T,V1,V2) if
> (__traits(compiles,mixin("*here = writeThis"))) does not match any
> function template declaration
> 
> Error: template core.atomic.cas(T,V1,V2) if
> (__traits(compiles,mixin("*here = writeThis"))) cannot deduce template
> function from argument types !()(shared(Int*),shared(Int),shared(Int))
> 
> Is it not possible to compare and swap object references in the cas
> function call? Would someone kindly tell me as to what I am doing wrong?
> 
> Thanks.
> - Adrian.


Hi, 

I think I got it; the class (Int) needs to be declared as shared.

Thanks.
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