Module: Exchange::ErrorSafe

Defined in:
lib/exchange/core_extensions/float/error_safe.rb

Overview

Make Floating Points forget about their incapabilities when dealing with money

Since:

  • 0.1

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object

Since:

  • 0.1



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# File 'lib/exchange/core_extensions/float/error_safe.rb', line 31

def self.included base
  %W(* / + -).each do |meth|
    
    # @macro prevent_errors_with_exchange_for
    #
    prevent_errors_with_exchange_for base, meth.to_sym
    
  end
end

.money_error_preventing_method_chain(base, meth) ⇒ Object

Installs a method chain that overwrites the old error prone meth with the new one

Since:

  • 0.1



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# File 'lib/exchange/core_extensions/float/error_safe.rb', line 10

def self.money_error_preventing_method_chain base, meth
  base.send :alias_method, :"#{meth}_with_errors", meth
  base.send :alias_method, meth, :"#{meth}_without_errors"
end

.prevent_errors_with_exchange_for(base, meth) ⇒ Object

Since:

  • 0.1



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# File 'lib/exchange/core_extensions/float/error_safe.rb', line 20

def self.prevent_errors_with_exchange_for base, meth
  base.send(:define_method, :"#{meth}_without_errors", lambda { |other|
    if other.is_a?(Exchange::Money)
      BigDecimal.new(self.to_s).send(meth, other.value).to_f
    else
      send(:"#{meth}_with_errors", other)
    end
  })
  money_error_preventing_method_chain base, meth
end