std::full_extent, std::full_extent_t
From cppreference.com
| Defined in header <mdspan>
|
||
| struct full_extent_t { explicit full_extent_t() = default; }; |
(1) | (since C++26) |
| inline constexpr std::full_extent_t full_extent {}; |
(2) | (since C++26) |
1) The class
std::full_extent_t is a slice specifier type that can be used in std::submdspan.2) The corresponding
std::full_extent instance of (1) is a slice specifier to indicate full range of indices in the specified extent in std::submdspan.[edit] Example
Run this code
#include <mdspan> #include <print> void print(auto view) { static_assert(view.rank() <= 2); if constexpr (view.rank() == 2) { for (std::size_t i = 0; i != view.extent(0); ++i) { for (std::size_t j = 0; j != view.extent(1); ++j) std::print("{} ", view[i, j]); std::println(); } } else if constexpr (view.rank() == 1) { for (std::size_t i = 0; i != view.extent(0); ++i) std::print("{} ", view[i]); std::println(); } else std::println("{}", view[]); std::println(); } int main() { const char letters []{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I'}; const std::mdspan view(letters, 3, 3); print(view); print(std::submdspan(view, std::full_extent, std::full_extent)); print(std::submdspan(view, std::full_extent, 1)); print(std::submdspan(view, 1, std::full_extent)); print(std::submdspan(view, 2, 1)); }
Possible output:
A B C D E F G H I A B C D E F G H I B E H D E F H
[edit] See also
| (C++26) |
returns a view of a subset of an existing mdspan (function template) |
