equaler - equaler.go

     1  // Package equaler gives a simple interface to compare objects of arbitrary types.
     2  package equaler // import "vimagination.zapto.org/equaler"
     3  
     4  // Equaler is a simple interface that is used to determine the equality of two
     5  // variables
     6  type Equaler interface {
     7  	Equal(interface{}) bool
     8  }
     9  
    10  type eFalse struct{}
    11  
    12  func (eFalse) Equal(interface{}) bool {
    13  	return false
    14  }
    15  
    16  func (eFalse) String() string {
    17  	return "Equaler - False"
    18  }
    19  
    20  type eThis struct{}
    21  
    22  func (eThis) Equal(e interface{}) bool {
    23  	_, ok := e.(eThis)
    24  	return ok
    25  }
    26  
    27  func (eThis) String() string {
    28  	return "Equaler - This"
    29  }
    30  
    31  var (
    32  	// EFalse represents an Equaler that never matches, even against itself
    33  	EFalse Equaler = eFalse{}
    34  	// EThis represents an Equaler that only and always matches itself
    35  	EThis Equaler = eThis{}
    36  )
    37