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std::span::back(3) C++ Standard Libary std::span::back(3) NAME std::span::back - std::span::back Synopsis constexpr reference back() const; Returns a reference to the last element in the span. Calling back on an empty span results in undefined behavior. Parameters (none) Return value A reference to the back element. Complexity Constant Notes For a span c, the expression c.back() is equivalent to *(c.end()-1). Example // Run this code #include <span> #include <iostream> void print_forward(std::span<const int> const span) { for (auto n { span.size() }; n != 0; --n ) { std::cout << span.last(n).front() << ' '; } std::cout << '\n'; } void print_backward(std::span<const int> const span) { for (auto n { span.size() }; n != 0; --n) { std::cout << span.first(n).back() << ' '; } std::cout << '\n'; } int main() { constexpr int numbers[] { 0, 1, 2, 3, 4 }; print_forward(numbers); print_backward(numbers); } Output: 0 1 2 3 4 4 3 2 1 0 See also front access the first element (C++20) (public member function) http://cppreference.com 2022.07.31 std::span::back(3)
NAME | Synopsis | Parameters | Return value | Complexity | Notes | Example | Output: | See also
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