Class: AMQP::BitSet

Inherits:
Object
  • Object
show all
Defined in:
lib/amqp/bit_set.rb

Overview

Very minimalistic, pure Ruby implementation of bit set. Inspired by java.util.BitSet, although significantly smaller in scope.

Constant Summary collapse

ADDRESS_BITS_PER_WORD =

API

6
BITS_PER_WORD = 
(1 << ADDRESS_BITS_PER_WORD)
WORD_MASK = 
0xffffffffffffffff

Instance Method Summary collapse

Constructor Details

#initialize(nbits) ⇒ BitSet

Returns a new instance of BitSet.

Parameters:

  • Number (Integer) —

    of bits in the set



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# File 'lib/amqp/bit_set.rb', line 18

def initialize(nbits)
  @nbits = nbits

  self.init_words(nbits)
end

Instance Method Details

#clear ⇒ Object

Clears all bits in the set



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# File 'lib/amqp/bit_set.rb', line 58

def clear
  self.init_words(@nbits)
end

#get(i) ⇒ Boolean Also known as: []

Fetches flag value for given bit.

Parameters:

  • A (Integer) —

    bit to fetch

Returns:

  • (Boolean) —

    true if given bit is set, false otherwise



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# File 'lib/amqp/bit_set.rb', line 38

def get(i)
  w = self.word_index(i)

  (@words[w] & (1 << i)) != 0
end

#set(i) ⇒ Object

Sets (flags) given bit. This method allows bits to be set more than once in a row, no exception will be raised.

Parameters:

  • A (Integer) —

    bit to set



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# File 'lib/amqp/bit_set.rb', line 28

def set(i)
  w = self.word_index(i)
  @words[w] |= (1 << i)
end

#unset(i) ⇒ Object

Unsets (unflags) given bit. This method allows bits to be unset more than once in a row, no exception will be raised.

Parameters:

  • A (Integer) —

    bit to unset



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# File 'lib/amqp/bit_set.rb', line 49

def unset(i)
  w = self.word_index(i)
  return if w.nil?

  @words[w] &= ~(1 << i)
end