24 Containers library [containers]

24.7 Views [views]

24.7.3 Class template span [views.span]

24.7.3.2 Constructors, copy, and assignment [span.cons]

constexpr span() noexcept;
Constraints: Extent == dynamic_­extent || Extent == 0 is true.
Postconditions: size() == 0 && data() == nullptr.
template<class It> constexpr explicit(extent != dynamic_extent) span(It first, size_type count);
Constraints: Let U be remove_­reference_­t<iter_­reference_­t<It>>.
  • is_­convertible_­v<U(*)[], element_­type(*)[]> is true.
    [Note 1:
    The intent is to allow only qualification conversions of the iterator reference type to element_­type.
    — end note]
Preconditions:
Effects: Initializes data_­ with to_­address(first) and size_­ with count.
Throws: Nothing.
template<class It, class End> constexpr explicit(extent != dynamic_extent) span(It first, End last);
Constraints: Let U be remove_­reference_­t<iter_­reference_­t<It>>.
Preconditions:
Effects: Initializes data_­ with to_­address(first) and size_­ with last - first.
Throws: When and what last - first throws.
template<size_t N> constexpr span(type_identity_t<element_type> (&arr)[N]) noexcept; template<class T, size_t N> constexpr span(array<T, N>& arr) noexcept; template<class T, size_t N> constexpr span(const array<T, N>& arr) noexcept;
Constraints: Let U be remove_­pointer_­t<decltype(data(arr))>.
  • extent == dynamic_­extent || N == extent is true, and
  • is_­convertible_­v<U(*)[], element_­type(*)[]> is true.
    [Note 3:
    The intent is to allow only qualification conversions of the array element type to element_­type.
    — end note]
Effects: Constructs a span that is a view over the supplied array.
[Note 4:
type_­identity_­t affects class template argument deduction.
— end note]
Postconditions: size() == N && data() == data(arr) is true.
template<class R> constexpr explicit(extent != dynamic_extent) span(R&& r);
Constraints: Let U be remove_­reference_­t<ranges​::​range_­reference_­t<R>>.
  • R satisfies ranges​::​contiguous_­range and ranges​::​sized_­range.
  • Either R satisfies ranges​::​borrowed_­range or is_­const_­v<element_­type> is true.
  • remove_­cvref_­t<R> is not a specialization of span.
  • remove_­cvref_­t<R> is not a specialization of array.
  • is_­array_­v<remove_­cvref_­t<R>> is false.
  • is_­convertible_­v<U(*)[], element_­type(*)[]> is true.
    [Note 5:
    The intent is to allow only qualification conversions of the range reference type to element_­type.
    — end note]
Preconditions:
Effects: Initializes data_­ with ranges​::​data(r) and size_­ with ranges​::​size(r).
Throws: What and when ranges​::​data(r) and ranges​::​size(r) throw.
constexpr span(const span& other) noexcept = default;
Postconditions: other.size() == size() && other.data() == data().
template<class OtherElementType, size_t OtherExtent> constexpr explicit(see below) span(const span<OtherElementType, OtherExtent>& s) noexcept;
Constraints:
  • extent == dynamic_­extent || OtherExtent == dynamic_­extent || extent == OtherExtent is true, and
  • is_­convertible_­v<OtherElementType(*)[], element_­type(*)[]> is true.
    [Note 6:
    The intent is to allow only qualification conversions of the OtherElementType to element_­type.
    — end note]
Preconditions: If extent is not equal to dynamic_­extent, then s.size() is equal to extent.
Effects: Constructs a span that is a view over the range [s.data(), s.data() + s.size()).
Postconditions: size() == s.size() && data() == s.data().
Remarks: The expression inside explicit is equivalent to: extent != dynamic_extent && OtherExtent == dynamic_extent
constexpr span& operator=(const span& other) noexcept = default;
Postconditions: size() == other.size() && data() == other.data().