iequatable

I am using Entity Framework in my application. I implemented with the partial class of an entity the IEquatable<T> interface: Partial Class Address : Implements IEquatable(Of Address) 'Other part generated Public Overloads Function Equals(ByVal other As Address) As Boolean _ Implements System.IEquatable(Of Address).Equals If ReferenceEquals(Me, other) Then Return True Return AddressId = other.AddressId End Function Public Overrides Function Equals(ByVal obj As Object) As Boolean If obj Is Nothing Then Return MyBase.Equals(obj) If TypeOf obj Is Address Then Return Equals(DirectCast(obj, Address

I was thinking about how Swift ensures uniqueness for Set because I have turned one of my obj from Equatable to Hashable for free and so I came up with this simple Playground struct SimpleStruct: Hashable { let string: String let number: Int static func == (lhs: SimpleStruct, rhs: SimpleStruct) -> Bool { let areEqual = lhs.string == rhs.string print(lhs, rhs, areEqual) return areEqual } } var set = Set<SimpleStruct>() let first = SimpleStruct(string: "a", number: 2) set.insert(first) So my first question was: Will the static func == method be called anytime I insert a new obj inside the set?

I have implemented the IEquatable interface in a class with the following code. public bool Equals(ClauseBE other) { if (this._id == other._id) { return true; } return false; } public override bool Equals(Object obj) { if (obj == null) { return base.Equals(obj); } if (!(obj is ClauseBE)) { throw new InvalidCastException("The 'obj' argument is not a ClauseBE object."); } return Equals(obj as ClauseBE); } public override int GetHashCode() { return this._id.GetHashCode(); } public static bool operator ==(ClauseBE a, ClauseBE b) { // cast to object so we call the overloaded Equals function which

I'm attempting to create a simple generic node class that conforms to the Comparable protocol so that I can easily compare nodes without accessing their key. When I attempt to write the < and == functions, however, the compiler doesn't seem to like it. The < and == functions expect a type when defining the Node parameters. This was simple in Java where you defined equality and < internally to the class. Swift asks for it globally. Any thoughts ? Example: func < (lhs:Node<E:Comparable>, rhs:Node<E:Comparable>) -> Bool { return lhs.key < rhs.key } func == (lhs:Node<E:Comparable>, rhs:Node<E

I know the importance of overriding GetHashCode when implementing custom equality checks - for which I have implemented IEquality<T> interface, and also the difference between generic and non-generic Equals as discussed here. Now is there a point to override Equals(object t) ? Wouldn't everything come under generic Equals(T t) ? public override int GetHashCode() //required for hashsets and dictionaries { return Id; } public bool Equals(T other) //IEquatable<T> here { return Id == other.Id; } public override bool Equals(object obj) //required?? { return Equals(obj as T); } Unsealed types should

I have an Address class in C# that looks like this: public class Address { public string StreetAddress { get; set; } public string RuralRoute { get; set; } public string City { get; set; } public string Province { get; set; } public string Country { get; set; } public string PostalCode { get; set; } } I'm implementing equality and so I need to override the hash code. At first I was going to use the hashcode formula from EJ but then I thought: These are all string fields, can't I just just use a StringBuilder to concatenate them and return the hash code from that string? That is: var str = new