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Edit File: cdesc-OpenStruct.ri

U:RDoc::NormalClass[iI"OpenStruct:ET@I"Object;To:RDoc::Markup::Document:@parts[o;;[�:
@fileI"%ext/json/lib/json/add/ostruct.rb;T:0@omit_headings_from_table_of_contents_below0o;;[)o:RDoc::Markup::Paragraph;[	I"KAn OpenStruct is a data structure, similar to a Hash, that allows the ;TI"Pdefinition of arbitrary attributes with their accompanying values. This is ;TI"Qaccomplished by using Ruby's metaprogramming to define methods on the class ;TI"itself.;To:RDoc::Markup::BlankLine�S:RDoc::Markup::Heading:
leveli:	textI"
Examples;T@o:RDoc::Markup::Verbatim;[I"require "ostruct"
;TI"
;TI"person = OpenStruct.new
;TI" person.name = "John Smith"
;TI"person.age  = 70
;TI"
;TI"(person.name      # => "John Smith"
;TI"person.age       # => 70
;TI"person.address   # => nil
;T:@format0o;;[I"PAn OpenStruct employs a Hash internally to store the attributes and values ;TI"*and can even be initialized with one:;T@o;;[I"Qaustralia = OpenStruct.new(:country => "Australia", :capital => "Canberra")
;TI"B  # => #<OpenStruct country="Australia", capital="Canberra">
;T;0o;;[	I"MHash keys with spaces or characters that could normally not be used for ;TI"Nmethod calls (e.g. <code>()[]*</code>) will not be immediately available ;TI"Oon the OpenStruct object as a method for retrieval or assignment, but can ;TI"Astill be reached through the Object#send method or using [].;T@o;;[
I"?measurements = OpenStruct.new("length (in inches)" => 24)
;TI"7measurements[:"length (in inches)"]       # => 24
;TI"7measurements.send("length (in inches)")   # => 24
;TI"
;TI"0message = OpenStruct.new(:queued? => true)
;TI"9message.queued?                           # => true
;TI"%message.send("queued?=", false)
;TI":message.queued?                           # => false
;T;0o;;[I"IRemoving the presence of an attribute requires the execution of the ;TI"Idelete_field method as setting the property value to +nil+ will not ;TI"remove the attribute.;T@o;;[I"Kfirst_pet  = OpenStruct.new(:name => "Rowdy", :owner => "John Smith")
;TI"3second_pet = OpenStruct.new(:name => "Rowdy")
;TI"
;TI"first_pet.owner = nil
;TI"Jfirst_pet                 # => #<OpenStruct name="Rowdy", owner=nil>
;TI"*first_pet == second_pet   # => false
;TI"
;TI"$first_pet.delete_field(:owner)
;TI"?first_pet                 # => #<OpenStruct name="Rowdy">
;TI")first_pet == second_pet   # => true
;T;0o;;[I"YRactor compatibility: A frozen OpenStruct with shareable values is itself shareable.;T@S;
;i;I"Caveats;T@o;;[I"RAn OpenStruct utilizes Ruby's method lookup structure to find and define the ;TI"Pnecessary methods for properties. This is accomplished through the methods ;TI"0method_missing and define_singleton_method.;T@o;;[
I"SThis should be a consideration if there is a concern about the performance of ;TI"Qthe objects that are created, as there is much more overhead in the setting ;TI"?of these properties compared to using a Hash or a Struct. ;TI"JCreating an open struct from a small Hash and accessing a few of the ;TI"Fentries can be 200 times slower than accessing the hash directly.;T@o;;[I"VThis is a potential security issue; building OpenStruct from untrusted user data ;TI"W(e.g. JSON web request) may be susceptible to a "symbol denial of service" attack ;TI"Tsince the keys create methods and names of methods are never garbage collected.;T@o;;[I"LThis may also be the source of incompatibilities between Ruby versions:;T@o;;[I"o = OpenStruct.new
;TI"?o.then # => nil in Ruby < 2.6, enumerator for Ruby >= 2.6
;T;0o;;[I"PBuiltin methods may be overwritten this way, which may be a source of bugs ;TI"or security issues:;T@o;;[	I"o = OpenStruct.new
;TI"Jo.methods # => [:to_h, :marshal_load, :marshal_dump, :each_pair, ...
;TI"o.methods = [:foo, :bar]
;TI"!o.methods # => [:foo, :bar]
;T;0o;;[I"\To help remedy clashes, OpenStruct uses only protected/private methods ending with `!` ;TI"Dand defines aliases for builtin public methods by adding a `!`:;T@o;;[I"9o = OpenStruct.new(make: 'Bentley', class: :luxury)
;TI"o.class # => :luxury
;TI"o.class! # => OpenStruct
;T;0o;;[I"KIt is recommended (but not enforced) to not use fields ending in `!`; ;TI"\Note that a subclass' methods may not be overwritten, nor can OpenStruct's own methods ;TI"ending with `!`.;T@o;;[I"AFor all these reasons, consider not using OpenStruct at all.;T;	I"lib/ostruct.rb;T;
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