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Is it possible to overload equivalence (==) operator for a custom class inside that custom class. However I know that it is possible to have this operator overloaded outside class scope. Appreciate any sample code. Thanks in advance.
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To overloading a prefix operator, we need to add a prefix keyword before a func . In the following example, I overload the - unary operator for a string, which will reverse the characters in a given string. <1> We add the prefix keyword to tell the compiler that this is intended to use as a prefix operator.
Operator overloading is a powerful feature of Swift that can make development much more efficient, if you do it with care.
In Swift, two or more functions may have the same name if they differ in parameters (different number of parameters, different types of parameters, or both). These functions are called overloaded functions and this feature is called function overloading.
Examples of basic operators available in Swift A common example of an infix operator is the + sign which falls under the category Binary operators. It's called an infix operator as it appears in between two values. Swift also comes with a Ternary operator the operates on three targets.
Add global functions. For example:
class CustomClass {
var id = "my id"
}
func ==(lhs: CustomClass, rhs: CustomClass) -> Bool {
return lhs == rhs
}
func !=(lhs: CustomClass, rhs: CustomClass) -> Bool {
return !(lhs == rhs)
}
class CustomClass: Equatable {
var id = "my id"
}
func ==(left: CustomClass, right: CustomClass) -> Bool {
return left.id == right.id
}
class CustomClass {
var id = "my id"
}
extension CustomClass: Equatable {
static func ==(lhs: CustomClass, rhs: CustomClass) -> Bool {
return lhs.id == rhs.id
}
}
No, operators are overloaded using global functions.
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