Returns true
if a local variable symbol
exists.
def foo a = 1 binding.local_variable_defined?(:a) #=> true binding.local_variable_defined?(:b) #=> false end
This method is the short version of the following code:
binding.eval("defined?(#{symbol}) == 'local-variable'")
Same as each
, but the row index and column index in addition to the element
Matrix[ [1,2], [3,4] ].each_with_index do |e, row, col| puts "#{e} at #{row}, #{col}" end # => Prints: # 1 at 0, 0 # 2 at 0, 1 # 3 at 1, 0 # 4 at 1, 1
Raises PStore::Error
if the calling code is not in a PStore#transaction
or if the code is in a read-only PStore#transaction
.
The block passed to this method will be called just before running the RDoc
generator. It is allowed to modify RDoc::Task
attributes inside the block.
Calls block with two arguments, the item and its index, for each item in enum. Given arguments are passed through to each().
If no block is given, an enumerator is returned instead.
hash = Hash.new %w(cat dog wombat).each_with_index { |item, index| hash[item] = index } hash #=> {"cat"=>0, "dog"=>1, "wombat"=>2}
Returns the last win32 Error
of the current executing Thread
or nil if none
Sets the last win32 Error
of the current executing Thread
to error
Return internal class of obj.
obj can be an instance of InternalObjectWrapper
.
Note that you should not use this method in your application.
obj can be an instance of InternalObjectWrapper
.
Note that you should not use this method in your application.
For debugging the Ruby/OpenSSL library. Calls CRYPTO_mem_leaks_fp(stderr). Prints detected memory leaks to standard error. This cleans the global state up thus you cannot use any methods of the library after calling this.
Returns true
if leaks detected, false
otherwise.
This is available only when built with a capable OpenSSL
and –enable-debug configure option.
OpenSSL.mem_check_start NOT_GCED = OpenSSL::PKey::RSA.new(256) END { GC.start OpenSSL.print_mem_leaks # will print the leakage }
Specifies a Proc
object proc
to determine if a character in the user’s input is escaped. It should take the user’s input and the index of the character in question as input, and return a boolean (true if the specified character is escaped).
Readline
will only call this proc with characters specified in completer_quote_characters
, to discover if they indicate the end of a quoted argument, or characters specified in completer_word_break_characters
, to discover if they indicate a break between arguments.
If completer_quote_characters
is not set, or if the user input doesn’t contain one of the completer_quote_characters
or a ++ character, Readline
will not attempt to use this proc at all.
Raises ArgumentError
if proc
does not respond to the call method.
Returns the quoting detection Proc
object.
Specifies VI editing mode. See the manual of GNU Readline
for details of VI editing mode.
Raises NotImplementedError
if the using readline library does not support.
Returns true if vi mode is active. Returns false if not.
Raises NotImplementedError
if the using readline library does not support.
Specifies a Proc
object proc
to call after the first prompt has been printed and just before readline starts reading input characters.
See GNU Readline’s rl_pre_input_hook variable.
Raises ArgumentError
if proc
does not respond to the call method.
Raises NotImplementedError
if the using readline library does not support.
Returns a Proc
object proc
to call after the first prompt has been printed and just before readline starts reading input characters. The default is nil.
Raises NotImplementedError
if the using readline library does not support.
Verify internal consistency.
This method is implementation specific. Now this method checks generational consistency if RGenGC is supported.
Returns the size of memory allocated by malloc().
Only available if ruby was built with CALC_EXACT_MALLOC_SIZE
.
Returns information about the most recent garbage collection.
If the optional argument, hash, is given, it is overwritten and returned. This is intended to avoid probe effect.
Returns information about object moved in the most recent GC compaction.
The returned hash has two keys :considered and :moved. The hash for :considered lists the number of objects that were considered for movement by the compactor, and the :moved hash lists the number of objects that were actually moved. Some objects can’t be moved (maybe they were pinned) so these numbers can be used to calculate compaction efficiency.