Module: Fiddle::CStructBuilder
- Defined in:
- lib/fiddle/struct.rb
Overview
Used to construct C classes (CUnion, CStruct, etc)
Fiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.
Class Method Summary collapse
-
.create(klass, types, members) ⇒ Object
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) * correspondingmembers
.
Class Method Details
.create(klass, types, members) ⇒ Object
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
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# File '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(<<-EOS, __FILE__, __LINE__+1) def new_class.size() #{size} end def new_class.malloc() addr = Fiddle.malloc(#{size}) new(addr) end EOS return new_class end |