/// <summary>Returns whether given symbol is already used for a device or node.</summary>
/// <param name="symbol"></param>
/// <returns></returns>
private bool IsDefined(string symbol)
{
return(DefinedDevices.Contains(symbol) || NodeIndices.ContainsKey(symbol));
}
/// <summary>Adds given symbol to the set of device names, returns true if it not already used.</summary>
/// <param name="name"></param>
/// <returns></returns>
public bool TryDefineDevice(string name)
{
return(!IsDefined(name) && DefinedDevices.Add(name));
}
