/// <summary>
/// Connects given registers into one root register and returns that root.
/// If registers was already connected, returns simply their root register.
/// It is strongly required before doing any operation on qubits in different registers.
/// This method is used at the begin of every operation from namespace <see cref="N:Quantum.Operations"/>, as these methods usually operate on more than one register.
/// </summary>
/// <param name="refs">Registers or references to single qubits. Registers could be passed here, because they are implicitly casted to RegisterRef type.</param>
/// <returns>Root register, that contains connected registers given in arguments.</returns>
public Register GetRootRegister(params RegisterRef[] refs)
{
if (refs.Length == 0)
{
return(null);
}
else if (refs.Length == 1)
{
return(refs[0].Register.Root);
}
else if (refs.Length == 2)
{
if (refs[0].Register.Root != refs[1].Register.Root)
{
Register newRoot = new Register(_random);
newRoot.AddRegister(refs[1].Register);
newRoot.AddRegister(refs[0].Register);
return(newRoot);
}
else
{
return(refs[0].Register.Root);
}
}
else
{
Register firstRoot = GetRootRegister(refs[0], refs[1]);
RegisterRef[] newParams = new RegisterRef[refs.Length - 1];
newParams[0] = firstRoot;
Array.Copy(refs, 2, newParams, 1, refs.Length - 2);
return(GetRootRegister(newParams));
}
}
public void SetLevel(OperatorBase act, int level)
{
m_level.AddRegister(act, level);
}