method

create

v2_5_5 - Show latest stable - 0 notes - Class: CStructBuilder

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What's this?

create(klass, types, members) private

Construct a new class given a C:

class klass (CUnion, CStruct, or other that provide an #entity_class)
types (Fiddle::TYPE_INT, Fiddle::TYPE_SIZE_T, etc., see the C types constants)
corresponding members

Fiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.

Example:

require 'fiddle/struct'
require 'fiddle/cparser'

include Fiddle::CParser

types, members = parse_struct_signature(['int i','char c'])

MyStruct = Fiddle::CStructBuilder.create(Fiddle::CUnion, types, members)

obj = MyStruct.allocate

Show source

# File ext/fiddle/lib/fiddle/struct.rb, line 51
    def create(klass, types, members)
      new_class = Class.new(klass){
        define_method(:initialize){|addr|
          @entity = klass.entity_class.new(addr, types)
          @entity.assign_names(members)
        }
        define_method(:to_ptr){ @entity }
        define_method(:to_i){ @entity.to_i }
        members.each{|name|
          define_method(name){ @entity[name] }
          define_method(name + "="){|val| @entity[name] = val }
        }
      }
      size = klass.entity_class.size(types)
      new_class.module_eval(        def new_class.size()          #{size}        end        def new_class.malloc()          addr = Fiddle.malloc(#{size})          new(addr)        end, __FILE__, __LINE__+1)
      return new_class
    end

create

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