Class: CZMQ::FFI::Zlist

Inherits:
Object
  • Object
show all
Defined in:
lib/czmq-ffi-gen/czmq/ffi/zlist.rb

Overview

Note:

This class is 100% generated using zproject.

simple generic list container

Defined Under Namespace

Classes: DestroyedError

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ptr, finalize = true) ⇒ Zlist

Attaches the pointer ptr to this instance and defines a finalizer for it if necessary.

Parameters:

  • ptr (::FFI::Pointer)
  • finalize (Boolean) (defaults to: true) 


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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 24

def initialize(ptr, finalize = true)
  @ptr = ptr
  if @ptr.null?
    @ptr = nil # Remove null pointers so we don't have to test for them.
  elsif finalize
    @finalizer = self.class.create_finalizer_for @ptr
    ObjectSpace.define_finalizer self, @finalizer
  end
end

Class Method Details

.__new ⇒ Object 



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 18

alias :__new :new

.compare_fn ⇒ Object

Note:

WARNING: If your Ruby code doesn’t retain a reference to the FFI::Function object after passing it to a C function call, it may be garbage collected while C still holds the pointer, potentially resulting in a segmentation fault.

Create a new callback of the following type: Comparison function e.g. for sorting and removing.

typedef int (zlist_compare_fn) (
    void *item1, void *item2);



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 86

def self.compare_fn
  ::FFI::Function.new :int, [:pointer, :pointer], blocking: true do |item1, item2|
    result = yield item1, item2
    result = Integer(result)
    result
  end
end

.create_finalizer_for(ptr) ⇒ Proc

Parameters:

  • ptr (::FFI::Pointer)

Returns:

  • (Proc) 


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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 35

def self.create_finalizer_for(ptr)
  ptr_ptr = ::FFI::MemoryPointer.new :pointer

  Proc.new do
    ptr_ptr.write_pointer ptr
    ::CZMQ::FFI.zlist_destroy ptr_ptr
  end
end

.free_fn ⇒ Object

Note:

WARNING: If your Ruby code doesn’t retain a reference to the FFI::Function object after passing it to a C function call, it may be garbage collected while C still holds the pointer, potentially resulting in a segmentation fault.

Create a new callback of the following type: Callback function for zlist_freefn method

typedef void (zlist_free_fn) (
    void *data);



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 103

def self.free_fn
  ::FFI::Function.new :void, [:pointer], blocking: true do |data|
    result = yield data
    result
  end
end

.new ⇒ CZMQ::Zlist

Create a new list container

Returns:

  • (CZMQ::Zlist) 


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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 112

def self.new()
  ptr = ::CZMQ::FFI.zlist_new()
  __new ptr
end

.test(verbose) ⇒ void

This method returns an undefined value.

Self test of this class.

Parameters:

  • verbose (Boolean) 


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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 354

def self.test(verbose)
  verbose = !(0==verbose||!verbose) # boolean
  result = ::CZMQ::FFI.zlist_test(verbose)
  result
end

Instance Method Details

#__ptr ⇒ ::FFI::Pointer Also known as: to_ptr

Return internal pointer

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 49

def __ptr
  raise DestroyedError unless @ptr
  @ptr
end

#__ptr_give_ref ⇒ ::FFI::MemoryPointer

Note:

This detaches the current instance from the native object and thus makes it unusable.

Nullify internal pointer and return pointer pointer.

Returns:

  • (::FFI::MemoryPointer) —

    the pointer pointing to a pointer pointing to the native object

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 60

def __ptr_give_ref
  raise DestroyedError unless @ptr
  ptr_ptr = ::FFI::MemoryPointer.new :pointer
  ptr_ptr.write_pointer @ptr
  __undef_finalizer if @finalizer
  @ptr = nil
  ptr_ptr
end

#__undef_finalizer ⇒ void

Note:

Only use this if you need to and can guarantee that the native object will be freed by other means.

This method returns an undefined value.

Undefines the finalizer for this object.



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 72

def __undef_finalizer
  ObjectSpace.undefine_finalizer self
  @finalizer = nil
end

#append(item) ⇒ Integer

Append an item to the end of the list, return 0 if OK or -1 if this failed for some reason (invalid input). Note that if a duplicator has been set, this method will also duplicate the item.

Parameters:

  • item (::FFI::Pointer, #to_ptr)

Returns:

  • (Integer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 197

def append(item)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_append(self_p, item)
  result
end

#autofree ⇒ void

This method returns an undefined value.

Set list for automatic item destruction; item values MUST be strings. By default a list item refers to a value held elsewhere. When you set this, each time you append or push a list item, zlist will take a copy of the string value. Then, when you destroy the list, it will free all item values automatically. If you use any other technique to allocate list values, you must free them explicitly before destroying the list. The usual technique is to pop list items and destroy them, until the list is empty.

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 310

def autofree()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_autofree(self_p)
  result
end

#comparefn(fn) ⇒ void

This method returns an undefined value.

Sets a compare function for this list. The function compares two items. It returns an integer less than, equal to, or greater than zero if the first item is found, respectively, to be less than, to match, or be greater than the second item. This function is used for sorting, removal and exists checking.

Parameters:

  • fn (::FFI::Pointer, #to_ptr)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 325

def comparefn(fn)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_comparefn(self_p, fn)
  result
end

#destroy ⇒ void

This method returns an undefined value.

Destroy a list container



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 120

def destroy()
  return unless @ptr
  self_p = __ptr_give_ref
  result = ::CZMQ::FFI.zlist_destroy(self_p)
  result
end

#dup ⇒ Zlist

Make a copy of list. If the list has autofree set, the copied list will duplicate all items, which must be strings. Otherwise, the list will hold pointers back to the items in the original list. If list is null, returns NULL.

Returns:

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 257

def dup()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_dup(self_p)
  result = Zlist.__new result, true
  result
end

#exists(item) ⇒ Boolean

Checks if an item already is present. Uses compare method to determine if items are equal. If the compare method is NULL the check will only compare pointers. Returns true if item is present else false.

Parameters:

  • item (::FFI::Pointer, #to_ptr)

Returns:

  • (Boolean)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 233

def exists(item)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_exists(self_p, item)
  result
end

#first ⇒ ::FFI::Pointer

Return the item at the head of list. If the list is empty, returns NULL. Leaves cursor pointing at the head item, or NULL if the list is empty.

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 131

def first()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_first(self_p)
  result
end

#freefn(item, fn, at_tail) ⇒ ::FFI::Pointer

Set a free function for the specified list item. When the item is destroyed, the free function, if any, is called on that item. Use this when list items are dynamically allocated, to ensure that you don’t have memory leaks. You can pass ‘free’ or NULL as a free_fn. Returns the item, or NULL if there is no such item.

Parameters:

  • item (::FFI::Pointer, #to_ptr)
  • fn (::FFI::Pointer, #to_ptr)
  • at_tail (Boolean)

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 342

def freefn(item, fn, at_tail)
  raise DestroyedError unless @ptr
  self_p = @ptr
  at_tail = !(0==at_tail||!at_tail) # boolean
  result = ::CZMQ::FFI.zlist_freefn(self_p, item, fn, at_tail)
  result
end

#head ⇒ ::FFI::Pointer

Return first item in the list, or null, leaves the cursor

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 163

def head()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_head(self_p)
  result
end

#item ⇒ ::FFI::Pointer

Return the current item of list. If the list is empty, returns NULL. Leaves cursor pointing at the current item, or NULL if the list is empty.

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 184

def item()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_item(self_p)
  result
end

#last ⇒ ::FFI::Pointer

Return the item at the tail of list. If the list is empty, returns NULL. Leaves cursor pointing at the tail item, or NULL if the list is empty.

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 153

def last()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_last(self_p)
  result
end

#next ⇒ ::FFI::Pointer

Return the next item. If the list is empty, returns NULL. To move to the start of the list call zlist_first (). Advances the cursor.

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 142

def next()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_next(self_p)
  result
end

#null? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 44

def null?
  !@ptr or @ptr.null?
end

#pop ⇒ ::FFI::Pointer

Pop the item off the start of the list, if any

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 220

def pop()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_pop(self_p)
  result
end

#purge ⇒ void

This method returns an undefined value.

Purge all items from list

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 268

def purge()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_purge(self_p)
  result
end

#push(item) ⇒ Integer

Push an item to the start of the list, return 0 if OK or -1 if this failed for some reason (invalid input). Note that if a duplicator has been set, this method will also duplicate the item.

Parameters:

  • item (::FFI::Pointer, #to_ptr)

Returns:

  • (Integer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 210

def push(item)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_push(self_p, item)
  result
end

#remove(item) ⇒ void

This method returns an undefined value.

Remove the specified item from the list if present

Parameters:

  • item (::FFI::Pointer, #to_ptr)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 244

def remove(item)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_remove(self_p, item)
  result
end

#size ⇒ Integer

Return number of items in the list

Returns:

  • (Integer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 278

def size()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_size(self_p)
  result
end

#sort(compare) ⇒ void

This method returns an undefined value.

Sort the list. If the compare function is null, sorts the list by ascending key value using a straight ASCII comparison. If you specify a compare function, this decides how items are sorted. The sort is not stable, so may reorder items with the same keys. The algorithm used is combsort, a compromise between performance and simplicity.

Parameters:

  • compare (::FFI::Pointer, #to_ptr)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 293

def sort(compare)
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_sort(self_p, compare)
  result
end

#tail ⇒ ::FFI::Pointer

Return last item in the list, or null, leaves the cursor

Returns:

  • (::FFI::Pointer)

Raises:



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# File 'lib/czmq-ffi-gen/czmq/ffi/zlist.rb', line 173

def tail()
  raise DestroyedError unless @ptr
  self_p = @ptr
  result = ::CZMQ::FFI.zlist_tail(self_p)
  result
end