Class: VER::Struct

Inherits:

Struct

• Object
• Struct
• VER::Struct

Defined in:

lib/ver/struct.rb

Overview

A caching wrapper for Struct from Ruby core.

When reloading source in VER, sometimes a file will contain a class that inherits from Struct.new The issue is that Struct.new always returns a new class, even if the members are the same. This results in a “TypeError: superclass mismatch” exception. There are workarounds that use the defined? keyword to check whether the subclass has been defined yet, but that’s not very intuitive and results in issues for documentation. Not to mention it’s more mental overhead and more to type.

This class simply defines its own Struct.new method, which uses a constant Hash to keep all the Struct superclasses created so far along with the parameters used to create them. When it receives the same arguments, it returns the same superclass, problem solved.

Of course, if you change the arguments, source reloading will fail again until you restart VER or undefine the constant that holds the subclass.

Direct Known Subclasses

Action, Bookmarks::Bookmark, Event, Keymap, Keymap::Results::Impossible, Keymap::Results::Incomplete, MajorMode, Methods::Snippet::Scope, MinorMode, Register, VER::Syntax::Processor, Text::Index, Text::Mark, Text::Range, Text::Tag, Theme, Undo::AutoSeparator, Undo::Record, Undo::Tree, WidgetMajorMode

Constant Summary

CACHE =

{}

Class Method Summary

• .new(*args) ⇒ Object

Class Method Details

.new(*args) ⇒ Object

# File 'lib/ver/struct.rb', line 24

def self.new(*args)
  CACHE[args] ||= super
end