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Contents
require_relative '../backport'
module Datadog
module Core
module Utils
# Helper methods for safer dup
module SafeDup
# String#+@ was introduced in Ruby 2.3
if String.method_defined?(:+@) && String.method_defined?(:-@)
def self.frozen_or_dup(v)
# For the case of a String we use the methods +@ and -@.
# Those methods are only for String objects
# they are faster and chepaer on the memory side.
# Check the benchmark on
# https://github.com/DataDog/dd-trace-rb/pull/2704
if v.is_a?(String)
# If the string is not frozen, the +(-v) will:
# - first create a frozen deduplicated copy with -v
# - then it will dup it more efficiently with +v
v.frozen? ? v : +(-v)
else
v.frozen? ? v : Core::BackportFrom24.dup(v)
end
end
def self.frozen_dup(v)
# For the case of a String we use the methods -@
# That method are only for String objects
# they are faster and chepaer on the memory side.
# Check the benchmark on
# https://github.com/DataDog/dd-trace-rb/pull/2704
if v.is_a?(String)
-v if v
else
v.frozen? ? v : Core::BackportFrom24.dup(v).freeze
end
end
else
def self.frozen_or_dup(v)
v.frozen? ? v : Core::BackportFrom24.dup(v)
end
def self.frozen_dup(v)
v.frozen? ? v : Core::BackportFrom24.dup(v).freeze
end
end
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems