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std::span::empty

From cppreference.com
< cpp‎ | container‎ | span
[[nodiscard]] constexpr bool empty() const noexcept;

Checks if the span is empty.

[edit] Return value

true if the span is empty (i.e., size() == 0); false otherwise.

[edit] See also

returns the number of elements in the sequence
(public member function) [edit]