Thrift::Union

union are to be initialized with key-word arg to initialize a union

class MyUnion
  include ::Thrift::Union
  union_property x : Int32
  union_property y : String
end

a_union = MyUnion.new(x: 32532)
a_union.x # => 32532
other_union = MyUnion.new(y: "hello")
other_union.y # => "hello

method that will write a Thrift Union to a Transport encoding in the Given Protocol

require "thrift"

class MyUnion
  include ::Thrift::Union

  @[::Thrift::Type::SerialOpts(fid: 0)]
  union_property prop_int : Int32
  @[::Thrift::Type::SerialOpts(fid: 1)]
  union_property prop_str : String
end

transport = Thrift::Transport::MemoryBufferTransport.new
protocol = Thrift::Protocol::BinaryProtocol.new(transport)

my_union = MyUnion.new(prop_int: 12)
my_union.write to: protocol
transport.peek # => Bytes[8, 0, 0, 0, 0, 0, 12, 0]

inherited macro to define a property for a union

union_property x : Int32

is equivalent to

@[UnionVar]
def x : Int32
  @storage_internal.as(Int32)
end

def x=(@storage_internal : Int32)
end