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author | yuuji.yaginuma <yuuji.yaginuma@gmail.com> | 2016-12-07 09:24:50 +0900 |
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committer | yuuji.yaginuma <yuuji.yaginuma@gmail.com> | 2016-12-13 07:35:36 +0900 |
commit | 2cb855812066b64e7e10e40096a4c4e8e8256afb (patch) | |
tree | 77daf403b7f9673928bd34800f9aefc162595147 /activesupport/lib/active_support/core_ext | |
parent | 1373f9bdcf725f75832dc7401994cc76113a8a4e (diff) | |
download | rails-2cb855812066b64e7e10e40096a4c4e8e8256afb.tar.gz rails-2cb855812066b64e7e10e40096a4c4e8e8256afb.tar.bz2 rails-2cb855812066b64e7e10e40096a4c4e8e8256afb.zip |
change return value of `duplicable?` with Ruby 2.4+
`NilClass`, `FalseClass`, `TrueClass`, `Symbol` and `Numeric` can dup
with Ruby 2.4+.
Ref: https://bugs.ruby-lang.org/issues/12979
Diffstat (limited to 'activesupport/lib/active_support/core_ext')
-rw-r--r-- | activesupport/lib/active_support/core_ext/object/duplicable.rb | 91 |
1 files changed, 58 insertions, 33 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/duplicable.rb b/activesupport/lib/active_support/core_ext/object/duplicable.rb index aa2282cb7e..ebe31b38ca 100644 --- a/activesupport/lib/active_support/core_ext/object/duplicable.rb +++ b/activesupport/lib/active_support/core_ext/object/duplicable.rb @@ -1,7 +1,7 @@ #-- -# Most objects are cloneable, but not all. For example you can't dup +nil+: +# Most objects are cloneable, but not all. For example you can't dup methods: # -# nil.dup # => TypeError: can't dup NilClass +# method(:puts).dup # => TypeError: allocator undefined for Method # # Classes may signal their instances are not duplicable removing +dup+/+clone+ # or raising exceptions from them. So, to dup an arbitrary object you normally @@ -19,7 +19,7 @@ class Object # Can you safely dup this object? # - # False for +nil+, +false+, +true+, symbol, number, method objects; + # False for method objects; # true otherwise. def duplicable? true @@ -27,52 +27,77 @@ class Object end class NilClass - # +nil+ is not duplicable: - # - # nil.duplicable? # => false - # nil.dup # => TypeError: can't dup NilClass - def duplicable? - false + begin + nil.dup + rescue TypeError + + # +nil+ is not duplicable: + # + # nil.duplicable? # => false + # nil.dup # => TypeError: can't dup NilClass + def duplicable? + false + end end end class FalseClass - # +false+ is not duplicable: - # - # false.duplicable? # => false - # false.dup # => TypeError: can't dup FalseClass - def duplicable? - false + begin + false.dup + rescue TypeError + + # +false+ is not duplicable: + # + # false.duplicable? # => false + # false.dup # => TypeError: can't dup FalseClass + def duplicable? + false + end end end class TrueClass - # +true+ is not duplicable: - # - # true.duplicable? # => false - # true.dup # => TypeError: can't dup TrueClass - def duplicable? - false + begin + true.dup + rescue TypeError + + # +true+ is not duplicable: + # + # true.duplicable? # => false + # true.dup # => TypeError: can't dup TrueClass + def duplicable? + false + end end end class Symbol - # Symbols are not duplicable: - # - # :my_symbol.duplicable? # => false - # :my_symbol.dup # => TypeError: can't dup Symbol - def duplicable? - false + begin + :symbol.dup + rescue TypeError + + # Symbols are not duplicable: + # + # :my_symbol.duplicable? # => false + # :my_symbol.dup # => TypeError: can't dup Symbol + def duplicable? + false + end end end class Numeric - # Numbers are not duplicable: - # - # 3.duplicable? # => false - # 3.dup # => TypeError: can't dup Integer - def duplicable? - false + begin + 1.dup + rescue TypeError + + # Numbers are not duplicable: + # + # 3.duplicable? # => false + # 3.dup # => TypeError: can't dup Integer + def duplicable? + false + end end end |