SingleForwardable
can be used to setup delegation at the object level as well.
printer = String.new printer.extend SingleForwardable # prepare object for delegation printer.def_delegator "STDOUT", "puts" # add delegation for STDOUT.puts() printer.puts "Howdy!"
Also, SingleForwardable
can be used to set up delegation for a Class
or Module
.
class Implementation def self.service puts "serviced!" end end module Facade extend SingleForwardable def_delegator :Implementation, :service end Facade.service #=> serviced!
If you want to use both Forwardable and SingleForwardable
, you can use methods def_instance_delegator and def_single_delegator
, etc.
A module to implement the Linda distributed computing paradigm in Ruby.
See the sample/drb/ directory in the Ruby distribution, from 1.8.2 onwards.
The Math
module contains module functions for basic trigonometric and transcendental functions. See class Float
for a list of constants that define Ruby’s floating point accuracy.
Domains and codomains are given only for real (not complex) numbers.
The top-level class representing any ASN.1 object. When parsed by ASN1.decode
, tagged values are always represented by an instance of ASN1Data
.
ASN1Data
for parsing tagged values When encoding an ASN.1 type it is inherently clear what original type (e.g. INTEGER, OCTET STRING etc.) this value has, regardless of its tagging. But opposed to the time an ASN.1 type is to be encoded, when parsing them it is not possible to deduce the “real type” of tagged values. This is why tagged values are generally parsed into ASN1Data
instances, but with a different outcome for implicit and explicit tagging.
An implicitly 1-tagged INTEGER value will be parsed as an ASN1Data
with
tag equal to 1
tag_class equal to :CONTEXT_SPECIFIC
value equal to a String
that carries the raw encoding of the INTEGER.
This implies that a subsequent decoding step is required to completely decode implicitly tagged values.
An explicitly 1-tagged INTEGER value will be parsed as an ASN1Data
with
tag equal to 1
tag_class equal to :CONTEXT_SPECIFIC
value equal to an Array
with one single element, an instance of OpenSSL::ASN1::Integer
, i.e. the inner element is the non-tagged primitive value, and the tagging is represented in the outer ASN1Data
int = OpenSSL::ASN1::Integer.new(1, 0, :IMPLICIT) # implicit 0-tagged seq = OpenSSL::ASN1::Sequence.new( [int] ) der = seq.to_der asn1 = OpenSSL::ASN1.decode(der) # pp asn1 => #<OpenSSL::ASN1::Sequence:0x87326e0 # @indefinite_length=false, # @tag=16, # @tag_class=:UNIVERSAL, # @tagging=nil, # @value= # [#<OpenSSL::ASN1::ASN1Data:0x87326f4 # @indefinite_length=false, # @tag=0, # @tag_class=:CONTEXT_SPECIFIC, # @value="\x01">]> raw_int = asn1.value[0] # manually rewrite tag and tag class to make it an UNIVERSAL value raw_int.tag = OpenSSL::ASN1::INTEGER raw_int.tag_class = :UNIVERSAL int2 = OpenSSL::ASN1.decode(raw_int) puts int2.value # => 1
int = OpenSSL::ASN1::Integer.new(1, 0, :EXPLICIT) # explicit 0-tagged seq = OpenSSL::ASN1::Sequence.new( [int] ) der = seq.to_der asn1 = OpenSSL::ASN1.decode(der) # pp asn1 => #<OpenSSL::ASN1::Sequence:0x87326e0 # @indefinite_length=false, # @tag=16, # @tag_class=:UNIVERSAL, # @tagging=nil, # @value= # [#<OpenSSL::ASN1::ASN1Data:0x87326f4 # @indefinite_length=false, # @tag=0, # @tag_class=:CONTEXT_SPECIFIC, # @value= # [#<OpenSSL::ASN1::Integer:0x85bf308 # @indefinite_length=false, # @tag=2, # @tag_class=:UNIVERSAL # @tagging=nil, # @value=1>]>]> int2 = asn1.value[0].value[0] puts int2.value # => 1
Raised by Encoding
and String
methods when the source encoding is incompatible with the target encoding.
Wrapper for arrays within a struct
This exception is raised if a generator or unparser error occurs.
Zlib::Deflate
is the class for compressing data. See Zlib::ZStream
for more information.
Zlib:Inflate is the class for decompressing compressed data. Unlike Zlib::Deflate
, an instance of this class is not able to duplicate (clone, dup) itself.
exception to wait for reading by EAGAIN. see IO.select
.
exception to wait for writing by EAGAIN. see IO.select
.
exception to wait for reading by EWOULDBLOCK. see IO.select
.
exception to wait for writing by EWOULDBLOCK. see IO.select
.
exception to wait for reading by EINPROGRESS. see IO.select
.
exception to wait for writing by EINPROGRESS. see IO.select
.
A CSV::Table
is a two-dimensional data structure for representing CSV
documents. Tables allow you to work with the data by row or column, manipulate the data, and even convert the results back to CSV
, if needed.
All tables returned by CSV
will be constructed from this class, if header row processing is activated.
Raised when the provided IP address is an invalid address.