Tri-State output port

Hi,

I have a simple tri-state output signal

sc_out<sc_logic> ctrlout;

If I write to it directly compilation fails:

ctrlout.write('Z'); // fails

The same applies to using a variable:

sc_logic local='Z'; // fails

The only one that works is:

sc_logic local;
local='Z';
ctrlout.write(local);

Do I really have to jump through so many hoops to assign a tri-state value to an output port?

I then found an example on the web which uses resolved types, even though I only have 1 driver the resolved type works:

sc_out_rv<1> out;
out.write('Z');

Am I correct in stating that even for a single driver I need to use the _rv types?

I also noticed that _resolved has the same issues, that is you cannot assign 'Z' directly.

Thanks for any advice.