I would like to create a state_machine class that contains some context information that can be written by orthogonal&lt;0&gt; and read by orthogonal&lt;1&gt;.&nbsp; Graphically:<br><span style="font-family: courier new,monospace;">
&nbsp;_______________</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">| State Machine |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
|_______________|______________</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">|&nbsp;&nbsp;&nbsp; StateA1 &lt;------&gt; StateA2&nbsp;&nbsp; |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">|&nbsp; - - - - - - - - - - - - - -&nbsp; |
</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">|&nbsp;&nbsp;&nbsp; StateB1 &lt;------&gt; StateB2&nbsp;&nbsp; |</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
|_______________________________|</span><br style="font-family: courier new,monospace;"><br>I declare using<br><br>struct StateA1, StateB1;<br>struct MyStateMachine : sc::state_machine&lt; MyStateMachine, mpl::list&lt;StateA1, StateB1&gt; &gt; {};
<br>struct StateA1 : sc::simple_state&lt;StateA1, MyStateMachine::orthogonal&lt;0&gt; &gt; {};<br><br>but get a compile error on line 2 as &quot;orthogonal not a member of MyStateMachine&quot;.&nbsp; Do I need to declare one state in MyStateMachine, and make the mpl::list a second template argument to it in order to get what I want?
<br><br>Thanks in advance,<br>Chris<br>