std::span::last(3) C++ Standard Libary std::span::last(3) NAME std::span::last - std::span::last Synopsis template< std::size_t Count > (1) (since C++20) constexpr std::span<element_type, Count> last() const; constexpr std::span<element_type, std::dynamic_extent> last( (2) (since C++20) size_type Count ) const; Obtains a span that is a view over the last Count elements of this span. The program is ill-formed if Count > Extent. The behavior is undefined if Count > size(). Return value 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. Example // Run this code #include <iostream> #include <span> #include <string_view> void println(std::string_view const title, auto const& container) { std::cout << title << '[' << std::size(container) << "]{ "; for (auto const& elem : container) std::cout << elem << ", "; std::cout << "};\n"; }; void run(std::span<const int> span) { println("span: ", span); std::span<const int, 3> span_last = span.last<3>(); println("span.last<3>(): ", span_last); std::span<const int, std::dynamic_extent> span_last_dynamic = span.last(2); println("span.last(2): ", span_last_dynamic); } int main() { int a[8]{1, 2, 3, 4, 5, 6, 7, 8}; println("int a", a); run(a); } Output: int a[8]{ 1, 2, 3, 4, 5, 6, 7, 8, }; span: [8]{ 1, 2, 3, 4, 5, 6, 7, 8, }; span.last<3>(): [3]{ 6, 7, 8, }; span.last(2): [2]{ 7, 8, }; See also first obtains a subspan consisting of the first N elements of the se- quence (public member function) subspan obtains a subspan (public member function) http://cppreference.com 2024.06.10 std::span::last(3)
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