Returns true
if the real and effective user IDs of a process may be exchanged on the current platform.
Exchange real and effective group IDs and return the new effective group ID. Not available on all platforms.
[Process.gid, Process.egid] #=> [0, 33] Process::GID.re_exchange #=> 0 [Process.gid, Process.egid] #=> [33, 0]
Returns true
if the real and effective group IDs of a process may be exchanged on the current platform.
Check if –yjit-stats is used.
Return a hash for statistics generated for the –yjit-stats command line option. Return nil when option is not passed or unavailable.
@param [Object] possibility a single possibility @param [Array] requirements an array of requirements @return [Boolean] whether the possibility satisfies all of the
given requirements
@param [Object] requirement @return [ResolutionState] the state whose ‘requirement` is the given
`requirement`.
@param [String] requirement_name the spec name to search for @return [Object] the locked spec named ‘requirement_name`, if one
is found on {#base}
Returns the configuration instance variables as a hash, that can be passed to the configure method.
Returns the order of the group.
See the OpenSSL
documentation for EC_GROUP_get_order()
See the OpenSSL
documentation for EC_GROUP_get_degree()
Reads len
bytes from the tar file entry, or the rest of the entry if nil
Rewinds to the beginning of the tar file entry
Topologically sorts the given vertices. @param [Enumerable<Vertex>] vertices the vertices to be sorted, which must
all belong to the same graph.
@return [Array<Vertex>] The sorted vertices.
Resolves the requested dependencies into a {DependencyGraph}, locking to the base dependency graph (if specified) @param [Array] requested an array of ‘requested’ dependencies that the
{#specification_provider} can understand
@param [DependencyGraph,nil] base the base dependency graph to which
dependencies should be 'locked'
Calls the given block with each successive grapheme cluster from self
(see Unicode Grapheme Cluster Boundaries); returns self
:
s = "\u0061\u0308-pqr-\u0062\u0308-xyz-\u0063\u0308" # => "ä-pqr-b̈-xyz-c̈" s.each_grapheme_cluster {|gc| print gc, ' ' }
Output:
ä - p q r - b̈ - x y z - c̈
Returns an enumerator if no block is given.
Returns the value of the given instance variable, or nil if the instance variable is not set. The @
part of the variable name should be included for regular instance variables. Throws a NameError
exception if the supplied symbol is not valid as an instance variable name. String
arguments are converted to symbols.
class Fred def initialize(p1, p2) @a, @b = p1, p2 end end fred = Fred.new('cat', 99) fred.instance_variable_get(:@a) #=> "cat" fred.instance_variable_get("@b") #=> 99
Sets the instance variable named by symbol to the given object. This may circumvent the encapsulation intended by the author of the class, so it should be used with care. The variable does not have to exist prior to this call. If the instance variable name is passed as a string, that string is converted to a symbol.
class Fred def initialize(p1, p2) @a, @b = p1, p2 end end fred = Fred.new('cat', 99) fred.instance_variable_set(:@a, 'dog') #=> "dog" fred.instance_variable_set(:@c, 'cat') #=> "cat" fred.inspect #=> "#<Fred:0x401b3da8 @a=\"dog\", @b=99, @c=\"cat\">"
Returns true
if the given instance variable is defined in obj. String
arguments are converted to symbols.
class Fred def initialize(p1, p2) @a, @b = p1, p2 end end fred = Fred.new('cat', 99) fred.instance_variable_defined?(:@a) #=> true fred.instance_variable_defined?("@b") #=> true fred.instance_variable_defined?("@c") #=> false
Defines a public singleton method in the receiver. The method parameter can be a Proc
, a Method
or an UnboundMethod
object. If a block is specified, it is used as the method body. If a block or a method has parameters, they’re used as method parameters.
class A class << self def class_name to_s end end end A.define_singleton_method(:who_am_i) do "I am: #{class_name}" end A.who_am_i # ==> "I am: A" guy = "Bob" guy.define_singleton_method(:hello) { "#{self}: Hello there!" } guy.hello #=> "Bob: Hello there!" chris = "Chris" chris.define_singleton_method(:greet) {|greeting| "#{greeting}, I'm Chris!" } chris.greet("Hi") #=> "Hi, I'm Chris!"