dtrace discuss - Sep 2006 - ?: operator

The following construct is accepted by Dtrace in an action block

1 ? exit(1) : 1;

However the following is not:

a = 1
a == 1 ? exit(1) : 1;

Error message is:
operator ?: operands must have compatible types.

Would like to understand why this is.

Thanks
Paul.
 
 
This message posted from opensolaris.org

On Fri, Sep 22, 2006 at 01:42:33AM -0700, Paul van den Bogaard
wrote:
> The following construct is accepted by Dtrace in an action block
> 
> 1 ? exit(1) : 1;
> 
> However the following is not:
> 
> a = 1
> a == 1 ? exit(1) : 1;
> 
> Error message is:
> operator ?: operands must have compatible types.
> 
> Would like to understand why this is.
Because enabling control blocks must be of constant size; allowing 
incompatible types with the ''?'' operator would allow an ECB of
varying
size to be created. 

	- Bryan

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Bryan Cantrill, Solaris Kernel Development.       http://blogs.sun.com/bmc