Container: Container Class
In container: Extending Base 'R' Lists
Container R Documentation
Container Class
Description
This class implements a container data structure with typical
member functions to insert, delete and access elements from the container.
For the standard S3 interface, see container().
Details
This class inherits from class Iterable and serves as the base
class for Deque, Set, and Dict.
Super class
container::Iterable -> Container
Methods
Public methods
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Inherited methods
Method new()
constructor
Usage
Container$new(...)
Arguments
...initial elements put into the Container
Returns
the Container object
Method add()
add element
Usage
Container$add(value, name = NULL)
Arguments
valuevalue of ANY type to be added to the Container.
namecharacter optional name attribute of the value.
Returns
the Container object
Method at()
Same as at2 (see below) but accepts a vector of
indices and always returns a Container object.
Usage
Container$at(index)
Arguments
indexvector of indices.
Returns
Container object with the extracted elements.
Method at2()
Extract value at index. If index is invalid or not
found, an error is signaled. If given as a string, the element
matching the name is returned. If there are two or more identical
names, the value of the first match (i.e. leftmost element) is
returned.
Usage
Container$at2(index)
Arguments
indexMust be a single number > 0 or a string.
Returns
If given as a number, the element at the corresponding
position, and if given as a string, the element at the
corresponding name matching the given string is returned.
Method clear()
delete all elements from the Container
Usage
Container$clear()
Returns
the cleared Container object
Method count()
Count number of element occurences.
Usage
Container$count(elem)
Arguments
elemelement to be counted.
Returns
integer number of elem occurences in the Container()
Method delete()
Search for occurence(s) of elem in Container and
remove first one that is found. If elem does not exist, an error
is signaled.
Usage
Container$delete(elem)
Arguments
elemelement to be removed from the Container.
Returns
the Container object
Method delete_at()
Delete value at given index. If index is not found, an
error is signaled.
Usage
Container$delete_at(index)
Arguments
indexcharacter or numeric index
Returns
the Container object
Method discard()
Search for occurence(s) of elem in Container and
remove first one that is found.
Usage
Container$discard(elem)
Arguments
elemelement to be discarded from the Container. If not
found, the operation is ignored and the object is not altered.
Returns
the Container object
Method discard_at()
Discard value at given index. If index is not found,
the operation is ignored.
Usage
Container$discard_at(index)
Arguments
indexcharacter or numeric index
Returns
the Container object
Method empty()
This function is deprecated. Use is_empty() instead.
Usage
Container$empty()
Method get_compare_fun()
Get comparison function used internally by the
Container object to compare elements.
Usage
Container$get_compare_fun()
Method has()
Determine if Container has some element.
Usage
Container$has(elem)
Arguments
elemelement to search for
Returns
TRUE if Container contains elem else FALSE
Method has_name()
Determine if Container object contains an element
with the given name. If called with no argument, the function
determines whether any element is named.
Usage
Container$has_name(name)
Arguments
namecharacter the name
Returns
TRUE if Container has the name otherwise FALSE
Method is_empty()
Check if Container is empty
Usage
Container$is_empty()
Returns
TRUE if the Container is empty else FALSE.
Method length()
Number of elements of the Container.
Usage
Container$length()
Returns
integer length of the Container, that is, the number of
elements it contains.
Method names()
Names of the elements.
Usage
Container$names()
Returns
character the names of the elements contained in x
Method peek_at()
Same as peek_at2 (see below) but accepts a vector of
indices and always returns a Container object.
Usage
Container$peek_at(index, default = NULL)
Arguments
indexvector of indices.
defaultthe default value to return in case the value at
index is not found.
Returns
Container object with the extracted elements.
Method peek_at2()
Peek at index and extract value. If index is invalid,
missing, or not not found, return default value.
Usage
Container$peek_at2(index, default = NULL)
Arguments
indexnumeric or character index to be accessed.
defaultthe default value to return in case the value at
index is not found.
Returns
the value at the given index or (if not found) the given
default value.
Method pop()
Get value at index and remove it from Container.
If index is not found, raise an error.
Usage
Container$pop(index)
Arguments
indexMust be a single number > 0 or a string.
Returns
If given as a number, the element at the corresponding
position, and if given as a string, the element at the
corresponding name matching the given string is returned.
Method print()
Print object representation
Usage
Container$print(...)
Arguments
...further arguments passed to format()
Returns
invisibly returns the Container object
Method rename()
Rename a key in the Container. An error is signaled,
if either the old key is not in the Container or the new key results
in a name-clash with an existing key.
Usage
Container$rename(old, new)
Arguments
oldcharacter name of key to be renamed.
newcharacter new key name.
Returns
the Container object
Method replace()
Replace one element by another element.
Search for occurence of old and, if found, replace it by new.
If old does not exist, an error is signaled, unless add was
set to TRUE, in which case new is added.
Usage
Container$replace(old, new, add = FALSE)
Arguments
oldelement to be replaced
newelement to be put instead of old
addlogical if TRUE the new element is added in case
old does not exists.
Returns
the Container object
Method replace_at()
Replace value at given index.
Replace value at index by given value. If index is not found, an
error is signalled, unless add was set to TRUE, in which case
new is added.
Usage
Container$replace_at(index, value, add = FALSE)
Arguments
indexcharacter or numeric index
valueANY new value to replace the old one.
addlogical if TRUE the new value element would be added
in case index did not exists.
Returns
the Container object
Method remove()
This function is deprecated. Use delete() instead.
Usage
Container$remove(elem)
Arguments
elemelement to be deleted from the Container. If element
is not found in the Container, an error is signaled.
Returns
the Container object
Method size()
This function is deprecated. Use length() instead.
Usage
Container$size()
Returns
the Container length
Method type()
This function is deprecated and of no real use anymore.
Usage
Container$type()
Returns
type (or mode) of internal vector containing the elements
Method update()
Add elements of other to this if the name is
not in the Container and update elements with existing names.
Usage
Container$update(other)
Arguments
otherIterable object used to update this.
Returns
returns the Container
Method values()
Get Container values
Usage
Container$values()
Returns
elements of the container as a base list
Method clone()
The objects of this class are cloneable with this method.
Usage
Container$clone(deep = FALSE)
Arguments
deepWhether to make a deep clone.
Author(s)
Roman Pahl
See Also
container(), Iterable, Deque, Set, and Dict
Examples
co = Container$new(1:5, c = Container$new("a", 1), l = list())
co$print()
co$length()
co$names()
co$clear()
# Extract
co = Container$new(a = 1, b = 2, c = 3, d = 4)
co$at(1:2)
co$at(c(1, 4))
co$at(list("d", 2))
co$at2(1)
try(co$at(0:2)) # index must be > 0
co$peek_at(0:2)
co$peek_at(0:2, default = 1)
# Replace
co$replace(4, 9)
co$replace(9, 11)
co$replace_at(1, -1)
try(co$replace_at(11, 1)) # index 11 exceeds length of Container
# Delete
co$delete(-1)
co$delete_at(3)
try(co$delete_at(3)) # index 3 exceeds length of Container
co$discard(3)
co2 = Container$new(b = 0)
co2$add(0, name = "a")
co$update(co2)
co$pop(1)
co
container documentation built on April 4, 2025, 5:13 a.m.
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| Container | R Documentation |
Container Class
Description
This class implements a container data structure with typical
member functions to insert, delete and access elements from the container.
For the standard S3 interface, see container().
Details
This class inherits from class Iterable and serves as the base class for Deque, Set, and Dict.
Super class
container::Iterable -> Container
Methods
Public methods
Inherited methods
Method new()
constructor
Usage
Container$new(...)
Arguments
...initial elements put into the
Container
Returns
the Container object
Method add()
add element
Usage
Container$add(value, name = NULL)
Arguments
valuevalue of
ANYtype to be added to theContainer.namecharacteroptional name attribute of the value.
Returns
the Container object
Method at()
Same as at2 (see below) but accepts a vector of
indices and always returns a Container object.
Usage
Container$at(index)
Arguments
indexvector of indices.
Returns
Container object with the extracted elements.
Method at2()
Extract value at index. If index is invalid or not found, an error is signaled. If given as a string, the element matching the name is returned. If there are two or more identical names, the value of the first match (i.e. leftmost element) is returned.
Usage
Container$at2(index)
Arguments
indexMust be a single number > 0 or a string.
Returns
If given as a number, the element at the corresponding position, and if given as a string, the element at the corresponding name matching the given string is returned.
Method clear()
delete all elements from the Container
Usage
Container$clear()
Returns
the cleared Container object
Method count()
Count number of element occurences.
Usage
Container$count(elem)
Arguments
elemelement to be counted.
Returns
integer number of elem occurences in the Container()
Method delete()
Search for occurence(s) of elem in Container and
remove first one that is found. If elem does not exist, an error
is signaled.
Usage
Container$delete(elem)
Arguments
elemelement to be removed from the
Container.
Returns
the Container object
Method delete_at()
Delete value at given index. If index is not found, an error is signaled.
Usage
Container$delete_at(index)
Arguments
indexcharacterornumericindex
Returns
the Container object
Method discard()
Search for occurence(s) of elem in Container and
remove first one that is found.
Usage
Container$discard(elem)
Arguments
elemelement to be discarded from the
Container. If not found, the operation is ignored and the object is not altered.
Returns
the Container object
Method discard_at()
Discard value at given index. If index is not found, the operation is ignored.
Usage
Container$discard_at(index)
Arguments
indexcharacterornumericindex
Returns
the Container object
Method empty()
This function is deprecated. Use is_empty() instead.
Usage
Container$empty()
Method get_compare_fun()
Get comparison function used internally by the
Container object to compare elements.
Usage
Container$get_compare_fun()
Method has()
Determine if Container has some element.
Usage
Container$has(elem)
Arguments
elemelement to search for
Returns
TRUE if Container contains elem else FALSE
Method has_name()
Determine if Container object contains an element
with the given name. If called with no argument, the function
determines whether any element is named.
Usage
Container$has_name(name)
Arguments
namecharacterthe name
Returns
TRUE if Container has the name otherwise FALSE
Method is_empty()
Check if Container is empty
Usage
Container$is_empty()
Returns
TRUE if the Container is empty else FALSE.
Method length()
Number of elements of the Container.
Usage
Container$length()
Returns
integer length of the Container, that is, the number of
elements it contains.
Method names()
Names of the elements.
Usage
Container$names()
Returns
character the names of the elements contained in x
Method peek_at()
Same as peek_at2 (see below) but accepts a vector of
indices and always returns a Container object.
Usage
Container$peek_at(index, default = NULL)
Arguments
indexvector of indices.
defaultthe default value to return in case the value at
indexis not found.
Returns
Container object with the extracted elements.
Method peek_at2()
Peek at index and extract value. If index is invalid,
missing, or not not found, return default value.
Usage
Container$peek_at2(index, default = NULL)
Arguments
indexnumericorcharacterindex to be accessed.defaultthe default value to return in case the value at
indexis not found.
Returns
the value at the given index or (if not found) the given default value.
Method pop()
Get value at index and remove it from Container.
If index is not found, raise an error.
Usage
Container$pop(index)
Arguments
indexMust be a single number > 0 or a string.
Returns
If given as a number, the element at the corresponding position, and if given as a string, the element at the corresponding name matching the given string is returned.
Method print()
Print object representation
Usage
Container$print(...)
Arguments
...further arguments passed to
format()
Returns
invisibly returns the Container object
Method rename()
Rename a key in the Container. An error is signaled,
if either the old key is not in the Container or the new key results
in a name-clash with an existing key.
Usage
Container$rename(old, new)
Arguments
oldcharactername of key to be renamed.newcharacternew key name.
Returns
the Container object
Method replace()
Replace one element by another element.
Search for occurence of old and, if found, replace it by new.
If old does not exist, an error is signaled, unless add was
set to TRUE, in which case new is added.
Usage
Container$replace(old, new, add = FALSE)
Arguments
oldelement to be replaced
newelement to be put instead of old
addlogicalifTRUEthenewelement is added in caseolddoes not exists.
Returns
the Container object
Method replace_at()
Replace value at given index.
Replace value at index by given value. If index is not found, an
error is signalled, unless add was set to TRUE, in which case
new is added.
Usage
Container$replace_at(index, value, add = FALSE)
Arguments
indexcharacterornumericindexvalueANYnew value to replace the old one.addlogicalifTRUEthe newvalueelement would be added in caseindexdid not exists.
Returns
the Container object
Method remove()
This function is deprecated. Use delete() instead.
Usage
Container$remove(elem)
Arguments
elemelement to be deleted from the
Container. If element is not found in theContainer, an error is signaled.
Returns
the Container object
Method size()
This function is deprecated. Use length() instead.
Usage
Container$size()
Returns
the Container length
Method type()
This function is deprecated and of no real use anymore.
Usage
Container$type()
Returns
type (or mode) of internal vector containing the elements
Method update()
Add elements of other to this if the name is
not in the Container and update elements with existing names.
Usage
Container$update(other)
Arguments
otherIterableobject used to update this.
Returns
returns the Container
Method values()
Get Container values
Usage
Container$values()
Returns
elements of the container as a base list
Method clone()
The objects of this class are cloneable with this method.
Usage
Container$clone(deep = FALSE)
Arguments
deepWhether to make a deep clone.
Author(s)
Roman Pahl
See Also
container(), Iterable, Deque, Set, and Dict
Examples
co = Container$new(1:5, c = Container$new("a", 1), l = list())
co$print()
co$length()
co$names()
co$clear()
# Extract
co = Container$new(a = 1, b = 2, c = 3, d = 4)
co$at(1:2)
co$at(c(1, 4))
co$at(list("d", 2))
co$at2(1)
try(co$at(0:2)) # index must be > 0
co$peek_at(0:2)
co$peek_at(0:2, default = 1)
# Replace
co$replace(4, 9)
co$replace(9, 11)
co$replace_at(1, -1)
try(co$replace_at(11, 1)) # index 11 exceeds length of Container
# Delete
co$delete(-1)
co$delete_at(3)
try(co$delete_at(3)) # index 3 exceeds length of Container
co$discard(3)
co2 = Container$new(b = 0)
co2$add(0, name = "a")
co$update(co2)
co$pop(1)
co
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