eq-typetrait-for-int.go

package eq

/*

eqInt declares a new instance of Eq trait, which is a real type.
The real type "knows" everything about equality in its own domain.
The instance of Eq is created as type over string, it is an intentional
technique to create a namespace using Golang constants.
The instance of trait is referenced as eq.Int in the code.
*/
type eqInt string

// the type "implements" equality behavior
func (eqInt) Equal(a, b int) bool { return a == b }

/*

Int is an instance of Eq trait for int domain as immutable value so that
other functions can use this constant like `eq.Int.Equal(...)`
*/
const Int = eqInt("eq.int")