Doesn't Support Collection Literals

[SorenSaket]

BiDirectionalDict doesn't support Collection Literals since theres no Add method.

To solve this either rename AddOrUpdate() to Add() or create a new Add() method.

To learn More:
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/collection-expressions

[TwentyFourMinutes]

@SorenSaket You are correct, however BiDirectionalDict requires a Key and Value, like normal dictionaries. Collection Literals do, at the time of writing, not support Dictionaries. See dotnet/csharplang#7822.

[SorenSaket]

Theres a difference between a collection literal and a dictionary literal. There's still advantages in implementing support for collection literals.

Implementation of Collection literals would allow for this:

BiDictionary<int, int> test = [
    new  (1,1)
    new  (21,3)
];

Support can be added by simply adding this to BiDictionary.cs:

public void Add((TFirst, TSecond) value)
{
  if (!_firstToSecond.ContainsKey(value.Item1))
  {
  _firstToSecond[value.Item1] = value.Item2;
  }
  
  if (!_secondToFirst.ContainsKey(value.Item2))
  {
  _secondToFirst[value.Item2] = value.Item1;
  }
}

The code works because the function is named add and takes a single tuple as input. You can alternativly implement as KeyValuePair instead of tuple.