class Fiddle::CUnionEntity

A pointer to a C union

Public Class Methods

Source

# File ext/fiddle/lib/fiddle/struct.rb, line 542
def CUnionEntity.size(types)
  types.map { |type, count = 1|
    if type.respond_to?(:entity_class)
      type.size * count
    else
      PackInfo::SIZE_MAP[type] * count
    end
  }.max
end

Returns the size needed for the union with the given types.

Fiddle::CUnionEntity.size(
  [ Fiddle::TYPE_DOUBLE,
    Fiddle::TYPE_INT,
    Fiddle::TYPE_CHAR,
    Fiddle::TYPE_VOIDP ]) #=> 8

Public Instance Methods

set_ctypes (types)

Source

# File ext/fiddle/lib/fiddle/struct.rb, line 554
def set_ctypes(types)
  @ctypes = types
  @offset = Array.new(types.length, 0)
  @size   = self.class.size types
end

Calculate the necessary offset and for each union member with the given types