xtd::span< type_t, extent > Class Template Reference

Inheritance diagram for xtd::span< type_t, extent >:

Definition

template<typename type_t, xtd::usize extent>
class xtd::span< type_t, extent >

Represents a non-owning view over a contiguous sequence of objects.

Definition

template<typename type_t, xtd::usize extent = dynamic_extent>
class span : public xtd::object, public xtd::iequatable<xtd::span<type_t, extent>>;

Header

#include <xtd/span>

Namespace

xtd

Library

xtd.core

Remarks

The class template xtd::span describes an object that can refer to a contiguous sequence of objects with the first element of the sequence at position zero. A span can either have a static extent, in which case the number of elements in the sequence is known at compile-time and encoded in the type, or a dynamic extent.

The referenced data can be modified through a xtd::span object. To prevent this, construct a xtd::span over a const type_t:

int numbers[] = {0, 1, 2};
span<int> span_numbers = numbers;
span_numbers[0] = 42; // numbers == {42, 1, 2};
span<const int> cspan_numbers = numbers;
cspan_numbers[0] = 0; // ERROR: cspan_numbers[0] is read-only

Examples

Create a span from memory.

#include <xtd/xtd>
 
auto main() -> int {
  // Create a span from memory.
  auto memory_pointer = new byte[100];
  auto memory_span = span(memory_pointer, 100);
 
  auto data = byte {};
  for (auto ctr = 0_z; ctr < memory_span.length(); ++ctr)
    memory_span[ctr] = data++;
  
  auto array_sum = 0;
  for (auto value : memory_span)
    array_sum += value;
  
  console::write_line("The sum is {}", array_sum);
  
  // Don't forget to free memory pointer allocation as xtd::span does not manage memory.
  delete[] memory_pointer;
}
 
// This code produces the following output :
//
// The sum is 4950

Create a span over an array.

#include <xtd/xtd>
 
auto main() -> int {
  // Create a span over an array.
  auto bytes = array<byte>(100);
  auto array_span = span(bytes);
  
  auto data = byte {};
  for (auto ctr = 0_z; ctr < array_span.length(); ++ctr)
    array_span[ctr] = data++;
  
  auto array_sum = 0;
  for (auto value : bytes)
    array_sum += value;
  
  console::write_line("The sum is {}", array_sum);
}
 
// This code produces the following output :
//
// The sum is 4950

Public Aliases
using	element_type
	Represents the span elemeent type.
using	value_type
	Represents the span value type.
using	size_type
	Represents the span size type (usually xtd::usize).
using	difference_type
	Represents the span difference type (usually xtd::ptrdiff).
using	pointer
	Represents the span pointer type.
using	const_pointer
	Represents the span const pointer type.
using	reference
	Represents the span reference type.
using	const_reference
	Represents the span const reference type.

Public Fields
static const span	empty_span
	Returns an empty xtd::span <type_t> object.

Public Constructors
template<xtd::usize count = 0>
constexpr	span ()
	Creates an empty xtd::span whose xtd::span::data is null and xtd::span::size is 0.
template<typename iterator_t>
constexpr	span (iterator_t first, iterator_t last)
	Creates an xtd::span with specified iterators.
template<xtd::usize len>
constexpr	span (element_type(&array)[len]) noexcept
	Creates an xtd::span with specified native array.
template<typename array_type_t, xtd::usize len>
constexpr	span (const std::array< array_type_t, len > &array) noexcept
	Creates an xtd::span with specified std::array.
template<typename array_type_t, xtd::usize len>
constexpr	span (std::array< array_type_t, len > &array) noexcept
	Creates an xtd::span with specified std::array.
template<typename array_type_t>
constexpr	span (const xtd::array< array_type_t > &items)
	Creates an xtd::span with specified collection and count.
template<typename array_type_t>
constexpr	span (xtd::array< array_type_t > &items)
	Creates an xtd::span with specified collection and count.
template<typename range_t>
constexpr	span (range_t &&range) noexcept
	Creates an xtd::span with specified range.
constexpr	span (std::initializer_list< type_t > items) noexcept
	Creates an xtd::span with specified initializer list.
template<typename collection_t>
constexpr	span (collection_t &items, size_type length)
	Creates an xtd::span with specified collection and count.
template<typename collection_t>
constexpr	span (collection_t &items, size_type start, size_type length)
	Creates an xtd::span with specified collection, offest and count.
constexpr	span (type_t *const data, size_type length)
	Creates an xtd::span with specified data pointer and count.
template<typename collection_t>
constexpr	span (collection_t &items, const xtd::range &range)
	Creates an xtd::span with specified collection, and range.

Public Properties
constexpr auto	data () const noexcept -> const_pointer
	Gets direct access to the underlying contiguous storage.
constexpr auto	data () noexcept -> pointer
	Gets direct access to the underlying contiguous storage.
constexpr auto	empty () const noexcept -> bool
	Returns a value that indicates whether the current xtd::span <type_t> is empty.
constexpr auto	is_empty () const noexcept -> bool
	Returns a value that indicates whether the current xtd::span <type_t> is empty.
constexpr auto	length () const noexcept -> size_type
	Returns the length of the current span.
constexpr auto	size () const noexcept -> size_type
	Returns the number of elements.
constexpr auto	size_bytes () const noexcept -> size_type
	Returns the size of the sequence in bytes.

Public Methods
auto	clear () noexcept -> void
	Clears the contents of this xtd::span <type> object.
template<xtd::usize length>
auto	copy_to (span< type_t, length > &destination) const -> void
	Copies the contents of this xtd::span <type_t> into a destination xtd:span <type_t>.
auto	equals (const object &obj) const noexcept -> bool override
	Determines whether the specified object is equal to the current object.
auto	equals (const span &rhs) const noexcept -> bool override
	Indicates whether the current object is equal to another object of the same type.
auto	fill (const type_t &value) -> void
	Fills the elements of this span with a specified value.
template<xtd::usize count>
auto	first () const -> span< type_t, count >
	Obtains a subspan consisting of the first count elements of the sequence.
auto	first (xtd::usize count) const -> span< type_t >
	Obtains a subspan consisting of the first count elements of the sequence.
auto	get_enumerator () const -> xtd::collections::generic::enumerator< type_t > override
	Returns an enumerator that iterates through a collection.
auto	get_hash_code () const noexcept -> xtd::usize override
	Serves as a hash function for a particular type.
template<xtd::usize count>
auto	last () const -> span< type_t, count >
	Obtains a subspan consisting of the last N elements of the sequence.
auto	last (xtd::usize count) const -> span< type_t >
	Obtains a subspan consisting of the last N elements of the sequence.
template<xtd::usize start, size_type lenght = xtd::dynamic_extent>
auto	slice () const -> span< type_t >
	Forms a slice out of the current span starting at a specified index for a specified length.
auto	slice (size_type start) const -> span< type_t >
	Forms a slice out of the current span that begins at a specified index.
auto	slice (size_type start, size_type length) const -> span< type_t >
	Forms a slice out of the current span starting at a specified index for a specified length.
template<xtd::usize offset, size_type count = xtd::dynamic_extent>
auto	subspan () const -> span< type_t >
	Forms a subspan of the current span starting at a specified index for a specified length.
auto	subspan (size_type offset, size_type count=xtd::dynamic_extent) const -> span< type_t >
	Forms a subspan of the current span starting at a specified index for a specified length.
auto	to_array () const noexcept -> xtd::array< value_type >
	Copies the contents of this span into a new array.
auto	to_string () const noexcept -> xtd::string override
	Returns the string representation of this xtd::span <type_t> object.
template<xtd::usize length>
auto	try_copy_to (span< type_t, length > &destination) const noexcept -> bool
	Attempts to copy the current xtd::span <type_t> to a destination xtd::span <type_t> and returns a value that indicates whether the copy operation succeeded.

Public Operators
auto	operator[] (size_type index) const -> const_reference
	Gets the element at the specified zero-based index.
auto	operator[] (size_type index) -> reference
	Gets the element at the specified zero-based index.
auto	operator[] (const xtd::index &index) const -> const_reference
	Gets the element at the specified zero-based index.
auto	operator[] (const xtd::index &index) -> reference
	Gets the element at the specified zero-based index.
auto	operator[] (const xtd::range &range) const -> xtd::read_only_span< type_t >
	Gets the elements at the specified range.
auto	operator[] (const xtd::range &range) -> span
	Gets the elements at the specified range.
auto	operator() (size_type index) const -> const_reference
	Gets the element at the specified zero-based index.
auto	operator() (size_type index) -> reference
	Gets the element at the specified zero-based index.
auto	operator() (const xtd::index &index) const -> const_reference
	Gets the element at the specified zero-based index.
auto	operator() (const xtd::index &index) -> reference
	Gets the element at the specified zero-based index.
auto	operator() (const xtd::range &range) const -> xtd::read_only_span< type_t >
	Gets the elements at the specified range.
auto	operator() (const xtd::range &range) -> span
	Gets the elements at the specified range.

Additional Inherited Members
using	value_type
	Represents the xtd::collections::generic::ienumerable value type.
using	iterator
	Represents the iterator of xtd::collections::generic::ienumerable value type.
using	const_iterator
	Represents the const iterator of xtd::collections::generic::ienumerable value type.
using	iterator
	Represents the iterator of enumerable value type.
using	const_iterator
	Represents the const iterator of enumerable value type.
using	enumerable_type
	Represents the ienumerable enumerable type.
using	value_type
	Represents the ienumerable value type.
using	ienumerable
	Represents the ienumerable value type.
using	list
	Represents the list value type.
	object ()=default
	Create a new instance of the ultimate base class object.
virtual auto	get_type () const noexcept -> type_object
	Gets the type of the current instance.
template<typename object_t>
auto	memberwise_clone () const -> xtd::unique_ptr_object< object_t >
	Creates a shallow copy of the current object.
virtual auto	equals (const type_t &) const noexcept -> bool=0
	Indicates whether the current object is equal to another object of the same type.
virtual auto	begin () const -> const_iterator
	Returns an iterator to the first element of the enumerable.
virtual auto	cbegin () const -> const_iterator
	Returns an iterator to the first element of the enumerable.
virtual auto	cend () const -> const_iterator
	Returns an iterator to the element following the last element of the enumerable.
virtual auto	end () const -> const_iterator
	Returns an iterator to the element following the last element of the enumerable.
auto	aggregate (func_t &&funcfunc) const -> type_t
	Applies an accumulator function over a sequence.
auto	all (predicate_t &&predicatepredicate) const -> bool
	Determines whether all elements of a sequence satisfy a condition.
auto	any () const noexcept -> bool
	Determines whether a sequence contains any elements.
auto	append (element_t &&element) const noexcept -> xtd::collections::generic::enumerable_generator< type_t >
	Appends a value to the end of the sequence.
auto	as_enumerable () const noexcept
	Returns the input typed as xtd::collections::generic::ienumerable <type_t>.
auto	average () const noexcept
	Computes the average of a sequence of value_t values.
auto	cast () const noexcept -> xtd::collections::generic::enumerable_generator< result_t >
	Casts the elements of an xtd::collections::generic::ienumerable to the specified type.
auto	chunk (xtd::usize size) const -> xtd::collections::generic::enumerable_generator< xtd::array< type_t > >
	Splits the elements of a sequence into chunks of size at most size.
auto	concat (second_t &&second) const noexcept -> xtd::collections::generic::enumerable_generator< type_t >
	Concatenates two sequences.
auto	contains (type_t &&value) const noexcept -> bool
	Determines whether a sequence contains a specified element by using the default equality comparer.
auto	count () const noexcept -> xtd::usize
	Returns the number of elements in current sequence.
auto	count_by (key_selector_t &&key_selector) const noexcept
	Returns the count of elements in the current sequence grouped by key.
auto	default_if_empty () const noexcept -> xtd::collections::generic::enumerable_generator< type_t >
	Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the current sequence is empty.
auto	distinct () const noexcept -> xtd::collections::generic::enumerable_generator< type_t >
	Returns distinct elements from a sequence by using the default equality comparer to compare values.
auto	first_or_default (predicate_t &&predicatepredicate, type_t &&default_value) const noexcept -> type_t
	Returns the first element of the sequence that satisfies a condition, or a specified default value if no such element is found.
auto	max () const -> type_t
	Returns the maximum value in a sequence of xtd::numeric values.
auto	min () const -> type_t
	Returns the minimum value in a sequence of xtd::numeric values.
auto	order () const -> xtd::collections::generic::enumerable_generator< type_t >
	Sorts the elements of a sequence in ascending order.
auto	order_by (const std::function< type_t(const type_t &)> &key_selector) const
	Sorts the elements of a sequence in ascending order according to a key.
auto	order_by_descending (const std::function< key_t(const type_t &)> &key_selector) const
	Sorts the elements of a sequence in descending order according to a key.
auto	select (auto &&selector) const
	Projects each element of a sequence into a new form.
auto	shuffle () const -> xtd::collections::generic::enumerable_generator< type_t >
	Shuffles the order of the elements of a sequence.
auto	skip (xtd::usize count) -> xtd::collections::generic::enumerable_generator< type_t >
	Bypasses a specified number of elements in a sequence and then returns the remaining elements.
auto	skip_while (auto &&predicatepredicate) -> xtd::collections::generic::enumerable_generator< type_t >
	Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.
auto	take (xtd::usize count) -> xtd::collections::generic::enumerable_generator< type_t >
	Returns a specified number of contiguous elements from the start of a sequence.
auto	take_while (auto &&predicatepredicate) -> xtd::collections::generic::enumerable_generator< type_t >
	Returns elements from a sequence as long as a specified condition is true, and then skips the remaining elements.
auto	to_array () const -> xtd::array< type_t >
	Creates a xtd::array <type_t> from an xtd::collections::generic::ienumerable <type_t>.
auto	to_list () const -> xtd::collections::generic::list< type_t >
	Creates a xtd::collections::generic::list <type_t> from an xtd::collections::generic::ienumerable <type_t>.
auto	where (auto &&predicatepredicate) const
	Filters a sequence of values based on a predicate.
template<typename object_a_t, typename object_b_t>
static auto	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept -> bool
	Determines whether the specified object instances are considered equal.
template<typename object_a_t, typename object_b_t>
static auto	reference_equals (const object_a_t &object_a, const object_b_t &object_b) noexcept -> bool
	Determines whether the specified object instances are the same instance.
static auto	to_const_iterator (typename source_collection_t::const_iterator &value, const source_collection_t &source_collection, const target_collection_t &target_collection) noexcept -> typename target_collection_t::const_iterator
	Converts source iterator to target iterator.
static auto	to_iterator (typename source_collection_t::const_iterator &value, const source_collection_t &source_collection, const target_collection_t &target_collection) noexcept -> typename target_collection_t::const_iterator
	Converts source iterator to target iterator.

Member Typedef Documentation

element_type

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::element_type

Represents the span elemeent type.

value_type

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::value_type

Represents the span value type.

size_type

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::size_type

Represents the span size type (usually xtd::usize).

difference_type

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::difference_type

Represents the span difference type (usually xtd::ptrdiff).

pointer

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::pointer

Represents the span pointer type.

const_pointer

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::const_pointer

Represents the span const pointer type.

reference

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::reference

Represents the span reference type.

const_reference

template<typename type_t, xtd::usize extent>

using xtd::span< type_t, extent >::const_reference

Represents the span const reference type.

Constructor & Destructor Documentation

span() [1/13]

template<typename type_t, xtd::usize extent>

template<xtd::usize count = 0>

xtd::span< type_t, extent >::span ( )

inlineconstexpr

Creates an empty xtd::span whose xtd::span::data is null and xtd::span::size is 0.

span() [2/13]

template<typename type_t, xtd::usize extent>

template<typename iterator_t>

xtd::span< type_t, extent >::span ( iterator_t first, iterator_t last )

inlineconstexpr

Creates an xtd::span with specified iterators.

Parameters

first	The iterator to the first element of the sequence.
last	The iterator to the last element of the sequence.

span() [3/13]

template<typename type_t, xtd::usize extent>

template<xtd::usize len>

xtd::span< type_t, extent >::span ( element_type(&) array[len] )

inlineconstexprnoexcept

Creates an xtd::span with specified native array.

Parameters

array

The native array to construct a view for.

span() [4/13]

template<typename type_t, xtd::usize extent>

template<typename array_type_t, xtd::usize len>

xtd::span< type_t, extent >::span ( const std::array< array_type_t, len > & array )

inlineconstexprnoexcept

Creates an xtd::span with specified std::array.

Parameters

array

The std::array to construct a view for.

span() [5/13]

template<typename type_t, xtd::usize extent>

template<typename array_type_t, xtd::usize len>

xtd::span< type_t, extent >::span ( std::array< array_type_t, len > & array )

inlineconstexprnoexcept

Creates an xtd::span with specified std::array.

Parameters

array

The std::array to construct a view for.

span() [6/13]

template<typename type_t, xtd::usize extent>

template<typename array_type_t>

xtd::span< type_t, extent >::span ( const xtd::array< array_type_t > & items )

inlineconstexpr

Creates an xtd::span with specified collection and count.

Parameters

items	The collection to construct a view for.
length	The number of elements in the collection.

Exceptions

xtd::argument_out_of_range_exception

if length is greater than items size.

span() [7/13]

template<typename type_t, xtd::usize extent>

template<typename array_type_t>

xtd::span< type_t, extent >::span ( xtd::array< array_type_t > & items )

inlineconstexpr

Creates an xtd::span with specified collection and count.

Parameters

items	The collection to construct a view for.
length	The number of elements in the collection.

Exceptions

xtd::argument_out_of_range_exception

if length is greater than items size.

span() [8/13]

template<typename type_t, xtd::usize extent>

template<typename range_t>

xtd::span< type_t, extent >::span ( range_t && range )

inlineconstexprnoexcept

Creates an xtd::span with specified range.

Parameters

range

The range to construct a view for.

span() [9/13]

template<typename type_t, xtd::usize extent>

xtd::span< type_t, extent >::span ( std::initializer_list< type_t > items )

inlineconstexprnoexcept

Creates an xtd::span with specified initializer list.

Parameters

items

The initializer list to construct a view for.

span() [10/13]

template<typename type_t, xtd::usize extent>

template<typename collection_t>

xtd::span< type_t, extent >::span ( collection_t & items, size_type length )

inlineconstexpr

Creates an xtd::span with specified collection and count.

Parameters

items	The collection to construct a view for.
length	The number of elements in the collection.

Exceptions

xtd::argument_out_of_range_exception

if length is greater than items size.

span() [11/13]

template<typename type_t, xtd::usize extent>

template<typename collection_t>

xtd::span< type_t, extent >::span ( collection_t & items, size_type start, size_type length )

inlineconstexpr

Creates an xtd::span with specified collection, offest and count.

Parameters

items	The collection to construct a view for.
start	The offset in the collection.
length	The number of elements in the collection.

Exceptions

xtd::argument_out_of_range_exception

if start or start + length are greater than items size.

span() [12/13]

template<typename type_t, xtd::usize extent>

xtd::span< type_t, extent >::span ( type_t *const data, size_type length )

inlineconstexpr

Creates an xtd::span with specified data pointer and count.

Parameters

data	The data pointer to construct a view for.
length	The number of elements to constuct.

span() [13/13]

template<typename type_t, xtd::usize extent>

template<typename collection_t>

xtd::span< type_t, extent >::span ( collection_t & items, const xtd::range & range )

inlineconstexpr

Creates an xtd::span with specified collection, and range.

Parameters

items	The collection to construct a view for.
range	The range of elements in the collection.

Exceptions

xtd::argument_out_of_range_exception

if range.start or range.start + range.end - range.start are greater than items size.

Member Function Documentation

data() [1/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::data ( ) const -> const_pointer

inlinenodiscardconstexprnoexcept

Gets direct access to the underlying contiguous storage.

Returns

A pointer to the beginning of the sequence.

data() [2/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::data ( ) -> pointer

inlinenodiscardconstexprnoexcept

Gets direct access to the underlying contiguous storage.

Returns

A pointer to the beginning of the sequence.

empty()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::empty ( ) const -> bool

inlinenodiscardconstexprnoexcept

Returns a value that indicates whether the current xtd::span <type_t> is empty.

Returns

true if the current span is empty; otherwise, false.

is_empty()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::is_empty ( ) const -> bool

inlinenodiscardconstexprnoexcept

Returns a value that indicates whether the current xtd::span <type_t> is empty.

Returns

true if the current span is empty; otherwise, false.

length()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::length ( ) const -> size_type

inlinenodiscardconstexprnoexcept

Returns the length of the current span.

Returns

The length of the current span.

size()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::size ( ) const -> size_type

inlinenodiscardconstexprnoexcept

Returns the number of elements.

Returns

The number of elements in the span.

size_bytes()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::size_bytes ( ) const -> size_type

inlinenodiscardconstexprnoexcept

Returns the size of the sequence in bytes.

Returns

The size of the sequence in bytes, i.e., size() * sizeof(element_type).

clear()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::clear ( ) -> void

inlinenoexcept

Clears the contents of this xtd::span <type> object.

Remarks

The xtd::span::clear method sets the items in the xtd::span <type_t> object to their default values. It does not remove items from the xtd::span <type_t>.

copy_to()

template<typename type_t, xtd::usize extent>

template<xtd::usize length>

auto xtd::span< type_t, extent >::copy_to ( span< type_t, length > & destination ) const -> void

inline

Copies the contents of this xtd::span <type_t> into a destination xtd:span <type_t>.

Parameters

destinaton

The destination xtd::span <type_t> object.

Exceptions

xtd::argument_exception

`destination` is shorter than the source xtd::span <type_t>.

equals() [1/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::equals ( const object & obj ) const -> bool

inlinenodiscardoverridevirtualnoexcept

Determines whether the specified object is equal to the current object.

Parameters

obj	The object to compare with the current object.

Returns

true if the specified object is equal to the current object. otherwise, false.

Reimplemented from xtd::object.

equals() [2/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::equals ( const span< type_t, extent > & rhs ) const -> bool

inlinenodiscardoverridenoexcept

Indicates whether the current object is equal to another object of the same type.

Parameters

obj	An object to compare with this object.

Returns

true if the current object is equal to the other parameter; otherwise, false.

fill()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::fill ( const type_t & value ) -> void

inline

Fills the elements of this span with a specified value.

Parameters

value

The value to assign to each element of the span.

first() [1/2]

template<typename type_t, xtd::usize extent>

template<xtd::usize count>

auto xtd::span< type_t, extent >::first ( ) const -> span< type_t, count >

inlinenodiscard

Obtains a subspan consisting of the first count elements of the sequence.

Parameters

count

The count elements.

Returns

A span r that is a view over the first count elements of *this, such that r.data() == this->data() && r.size() == count.

first() [2/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::first ( xtd::usize count ) const -> span< type_t >

inlinenodiscard

Obtains a subspan consisting of the first count elements of the sequence.

Parameters

count

The count elements.

Returns

A span r that is a view over the first count elements of *this, such that r.data() == this->data() && r.size() == count.

get_enumerator()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::get_enumerator ( ) const -> xtd::collections::generic::enumerator< type_t >

inlineoverridevirtual

Returns an enumerator that iterates through a collection.

Returns

An xtd::collections::generic::enumerator object that can be used to iterate through the collection.

Implements xtd::collections::generic::ienumerable< type_t >.

get_hash_code()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::get_hash_code ( ) const -> xtd::usize

inlinenodiscardoverridevirtualnoexcept

Serves as a hash function for a particular type.

Returns

A hash code for the current object.

Reimplemented from xtd::object.

last() [1/2]

template<typename type_t, xtd::usize extent>

template<xtd::usize count>

auto xtd::span< type_t, extent >::last ( ) const -> span< type_t, count >

inlinenodiscard

Obtains a subspan consisting of the last N elements of the sequence.

Parameters

count

The count elements.

Returns

A span r that is a view over the last count elements of *this, such that r.data() == this->data() + (this->size() - count) && r.size() == count.

last() [2/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::last ( xtd::usize count ) const -> span< type_t >

inlinenodiscard

Obtains a subspan consisting of the last N elements of the sequence.

Parameters

count

The count elements.

Returns

A span r that is a view over the last count elements of *this, such that r.data() == this->data() + (this->size() - count) && r.size() == count.

slice() [1/3]

template<typename type_t, xtd::usize extent>

template<xtd::usize start, size_type lenght = xtd::dynamic_extent>

auto xtd::span< type_t, extent >::slice ( ) const -> span< type_t >

inlinenodiscard

Forms a slice out of the current span starting at a specified index for a specified length.

Parameters

start	The zero-based index at which to begin this slice.
length	The desired length for the slice.

Returns

A span that consists of length elements from the current span starting at start.

Exceptions

xtd::argument_out_of_range_exception

`start` or `start + length` is less than zero or greater than xtd::span::length.

slice() [2/3]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::slice ( size_type start ) const -> span< type_t >

inlinenodiscard

Forms a slice out of the current span that begins at a specified index.

Parameters

start

The zero-based index at which to begin the slice.

Returns

A span that consists of all elements of the current span from start to the end of the span.

Exceptions

xtd::argument_out_of_range_exception

`start` is less than zero or greater than xtd::span::length.

slice() [3/3]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::slice ( size_type start, size_type length ) const -> span< type_t >

inlinenodiscard

Forms a slice out of the current span starting at a specified index for a specified length.

Parameters

start	The zero-based index at which to begin this slice.
length	The desired length for the slice.

Returns

A span that consists of length elements from the current span starting at start.

Exceptions

xtd::argument_out_of_range_exception

`start` or `start + length` is less than zero or greater than xtd::span::length.

subspan() [1/2]

template<typename type_t, xtd::usize extent>

template<xtd::usize offset, size_type count = xtd::dynamic_extent>

auto xtd::span< type_t, extent >::subspan ( ) const -> span< type_t >

inlinenodiscard

Forms a subspan of the current span starting at a specified index for a specified length.

Parameters

offset	The zero-based index at which to begin this slice.
count	The desired length for the slice.

Returns

A span that consists of length elements from the current span starting at start.

Exceptions

xtd::argument_out_of_range_exception

`offset` or `offset + count` is less than zero or greater than xtd::span::length.

subspan() [2/2]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::subspan ( size_type offset, size_type count = xtd::dynamic_extent ) const -> span< type_t >

inlinenodiscard

Forms a subspan of the current span starting at a specified index for a specified length.

Parameters

offset	The zero-based index at which to begin this slice.
count	The desired length for the slice.

Returns

A span that consists of length elements from the current span starting at start.

Exceptions

xtd::argument_out_of_range_exception

`offset` or `offset + count` is less than zero or greater than xtd::span::length.

to_array()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::to_array ( ) const -> xtd::array< value_type >

inlinenodiscardnoexcept

Copies the contents of this span into a new array.

Returns

An array containing the data in the current span.

to_string()

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::to_string ( ) const -> xtd::string

inlinenodiscardoverridevirtualnoexcept

Returns the string representation of this xtd::span <type_t> object.

Returns

The string representation of this xtd::span <type_t> object.

Remarks

For a xtd::span <type_t>, the xtd::span::to_string method returns a xtd::string that contains the characters pointed to by the xtd::span <type_t>. Otherwise, it returns a xtd::string with collection sequance string of the elements that the xtd::span <type_t> contains separated by , .

Reimplemented from xtd::object.

try_copy_to()

template<typename type_t, xtd::usize extent>

template<xtd::usize length>

auto xtd::span< type_t, extent >::try_copy_to ( span< type_t, length > & destination ) const -> bool

inlinenoexcept

Attempts to copy the current xtd::span <type_t> to a destination xtd::span <type_t> and returns a value that indicates whether the copy operation succeeded.

Parameters

destination

The target of the copy operation.

Returns

true if the copy operation succeeded; otherwise, false.

Remarks

This method copies all of source to destination even if source and destination overlap.

operator[]() [1/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[] ( size_type index ) const -> const_reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator[]() [2/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[] ( size_type index ) -> reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator[]() [3/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[] ( const xtd::index & index ) const -> const_reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator[]() [4/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[] ( const xtd::index & index ) -> reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator[]() [5/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[]

(

const xtd::range &

range

)

const -> xtd::read_only_span< type_t >

Gets the elements at the specified range.

Parameters

range

The range of the elements to set.

Remarks

This operator provides the ability to access a specific element in the collection by using the following syntax: my_collection[index].

operator[]() [6/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator[] ( const xtd::range & range ) -> span

inline

Gets the elements at the specified range.

Parameters

range

The range of the elements to set.

Remarks

This operator provides the ability to access a specific element in the collection by using the following syntax: my_collection[index].

operator()() [1/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator() ( size_type index ) const -> const_reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator()() [2/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator() ( size_type index ) -> reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator()() [3/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator() ( const xtd::index & index ) const -> const_reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator()() [4/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator() ( const xtd::index & index ) -> reference

inline

Gets the element at the specified zero-based index.

Parameters

index

The zero-based index of the element.

Returns

The element at the specified index.

Exceptions

xtd::index_out_of_range_exception

`index` is less than zero or greater than or equal to xtd::span::length.

operator()() [5/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator()

(

const xtd::range &

range

)

const -> xtd::read_only_span< type_t >

Gets the elements at the specified range.

Parameters

range

The range of the elements to set.

Remarks

This operator provides the ability to access a specific element in the collection by using the following syntax: my_collection[index].

operator()() [6/6]

template<typename type_t, xtd::usize extent>

auto xtd::span< type_t, extent >::operator() ( const xtd::range & range ) -> span

inline

Gets the elements at the specified range.

Parameters

range

The range of the elements to set.

Remarks

This operator provides the ability to access a specific element in the collection by using the following syntax: my_collection[index].

Member Data Documentation

empty_span

template<typename type_t, xtd::usize extent>

const span xtd::span< type_t, extent >::empty_span

static

Returns an empty xtd::span <type_t> object.

Returns

An empty xtd::span <type_t> object.

---

The documentation for this class was generated from the following files:

• xtd.core/include/xtd/internal/__span_definitions.hpp
• xtd.core/include/xtd/span.hpp