NAME

std::span::empty - std::span::empty

Synopsis

[[nodiscard]] constexpr bool empty() const noexcept; (since C++20)

Checks if the span is empty.

Parameters

(none)

Return value

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

Example

// Run this code

#include <iomanip>
#include <iostream>
#include <span>

int main()
{
std::span<const char> span{"ABCDEF"};

while (!span.empty())
{
std::cout << std::quoted(span.data()) << '\n';
span = span.last(span.size() - 1);
}
}

Output:

"ABCDEF"
"BCDEF"
"CDEF"
"DEF"
"EF"
"F"
""

See also

size returns the number of elements in the sequence
(C++20) (public member function)