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std::ranges::subrange<I,S,K>::size

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< cpp‎ | ranges‎ | subrange
 
 
 
std::ranges::subrange
Member functions
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subrange::size
(C++20)
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(C++20)
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(C++20)
 
constexpr /* see below */ size() const
    requires (K == ranges::subrange_kind::sized);
(since C++20)

Obtains the number of elements in the subrange.

The return type is the corresponding unsigned version of std::iter_difference_t<I>.

Contents

[edit] Parameters

(none)

[edit] Return value

s_ - i_ explicitly converted to the return type, where i_ and s_ are the stored iterator and sentinel respectively, if the size is not stored.

Otherwise, the stored size.

[edit] Notes

The size is stored into a subrange if and only if K == ranges::subrange_kind::sized but std::sized_sentinel_for<S, I> is not satisfied.

[edit] Example

[edit] See also

(C++20)
checks whether the subrange is empty
(public member function) [edit]
(C++17)(C++20)
returns the size of a container or array
(function template) [edit]
returns an unsigned integer equal to the size of a range
(customization point object) [edit]