/// <summary>Constructs a bijection out of two existing dictionaries.</summary>
/// <remarks>
/// To save time, the constructor does not verify that the two dictionaries
/// are a proper bijection; instead it works "on the honor system", and only
/// checks to ensure that the two dictionaries have the same <c>Count</c>.
/// The two dictionaries must already be a bijection (one-to-one maps into
/// each other) and should not be modified after they are attached to this
/// object. Of course, you can supply two empty dictionaries of any type.
/// </remarks>
public Bijection(IDictionary <K1, K2> cur, IDictionary <K2, K1> inv)
{
_map = cur;
_inverse = new Bijection <K2, K1>(inv, this);
if (cur.Count != inv.Count)
{
throw new InvalidStateException("Bijection(): invalid input, dictionaries have different lengths");
}
if (cur.IsReadOnly != inv.IsReadOnly)
{
throw new ArgumentException("Bijection(): IsReadOnly mismatch");
}
}
protected Bijection(IDictionary <K1, K2> cur, Bijection <K2, K1> other)
{
_map = cur;
_inverse = other;
}