Class: Contracts::Exactly

Inherits:

Object
CallableClass
Contracts::Exactly

Defined in:: lib/contracts/builtin_contracts.rb

Overview

Takes a class A. If argument is object of type A, the contract passes. If it is a subclass of A (or not related to A in any way), it fails. Example: Exactly[Numeric]

Instance Method Summary collapse

#initialize(cls) ⇒ Exactly constructor

A new instance of Exactly.
#to_s ⇒ Object
#valid?(val) ⇒ Boolean

Methods inherited from CallableClass

[]

Constructor Details

#initialize(cls) ⇒ `Exactly`

Returns a new instance of Exactly.



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# File 'lib/contracts/builtin_contracts.rb', line 191

def initialize(cls)
  @cls = cls
end

Instance Method Details

#to_s ⇒ `Object`



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# File 'lib/contracts/builtin_contracts.rb', line 199

def to_s
  "exactly #{@cls.inspect}"
end

#valid?(val) ⇒ `Boolean`

Returns:

(Boolean)



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# File 'lib/contracts/builtin_contracts.rb', line 195

def valid?(val)
  val.class == @cls
end