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module IMW
# A simple counter. The +value+ and +add+ methods read and
# increment the counter's value.
#
# counter = IMW::Counter.new
# counter.value #=> 0
# counter.add 1
# counter.value #=> 1
#
# The +next!+ method acts as like C's <tt>value++</tt>, incrementing
# +value+ _after_ it is referenced.
#
# counter = IMW::Counter.new
# counter.value #=> 0
# counter.next! #=> 0
# counter.value #=> 1
#
# Counters can also be reset
#
# counter.reset!
# counter.value #=> 0
class Counter
attr_accessor :value, :starting_value, :increment
# Return a new Counter. The first argument is the starting value
# (defaults to 0) and the second is the increment (defaults to 1).
def initialize starting_value=0,increment=1
@starting_value = starting_value
@value = starting_value
@increment = increment
end
# Add +amount+ (defaults to the value of <tt>@increment</tt>).
def add amount=nil
@value += amount || @increment
end
alias_method :add!, :add
# Increment the counter by <tt>@increment</tt> but return its
# value _before_ being incremented.
def next!
old_value = @value
@value += @increment
old_value
end
# Reset the counter to +value+ (defaults to the value of
# <tt>@starting_value</tt>).
def reset! value=nil
@value = value || @starting_value
end
end
end
# puts "#{File.basename(__FILE__)}: Your Monkeywrench seems suddenly more utilisable." # at bottom
Version data entries
19 entries across 19 versions & 1 rubygems