Class: BitAttrs::Bitset

Inherits:
Object
  • Object
show all
Defined in:
lib/bit_attrs/bitset.rb

Instance Method Summary collapse

Constructor Details

#initialize(flags_map, mask = 0) ⇒ Bitset

Returns a new instance of Bitset.



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# File 'lib/bit_attrs/bitset.rb', line 4

def initialize(flags_map, mask = 0)
  @flags_map = flags_map
  @mask = mask.to_i
end

Instance Method Details

#[](flag) ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 15

def [](flag)
  i = @flags_map[flag.to_sym]
  bit = (@mask >> i) & 1

  bit == 1
end

#[]=(flag, value) ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 22

def []=(flag, value)
  i = @flags_map[flag.to_sym]

  if truthy?(value)
    @mask |= 1 << i
  else
    @mask &= ~(1 << i)
  end
end

#each(&block) ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 32

def each(&block)
  self.to_h.each &block
end

#inspect ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 36

def inspect
  to_h.inspect
end

#to_h ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 9

def to_h
  @flags_map.inject({}) do |memo, (flag, _i)|
    memo.merge! flag => self[flag]
  end
end

#to_i ⇒ Object 



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# File 'lib/bit_attrs/bitset.rb', line 40

def to_i
  @mask
end