====== Device plugins ======
===== Implementation =====
==== Ports ====

== void set_port_by_name(std::string& name, std::string& value) ==
Make a connection between a port and the rest of the circuit, by name as in Verilog.  Usually this is not needed because the inherited method will do the right thing.

== void set_port_by_index(int index, std::string& value) ==
Make a connection between a port and the rest of the circuit, by position as in Spice.  Usually this is not needed because the inherited method will do the right thing.

== std::string port_name(int i)const ==
Return the name of a port given its index.  This is required, because all devices have unique port names.

=== Current ports ===

Most devices do not have current ports, so these methods are usually not needed.

== void set_current_port_by_index(int, const std::string&) ==
Make a connection between a current port and the rest of the circuit, by position as in Spice.  This is required if the device has current ports.

== const std::string current_port_value(int)const ==
Return the name of the element that a current port is connected to.  This is required if the device has current ports.

== std::string current_port_name(int)const ==
Return the name of a current port given its index.  This is required if the device has current ports.