std::full_extent, std::full_extent_t - cppreference.com (original) (raw)

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

#include #include   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

| | returns a view of a subset of an existing mdspan (function template) [edit] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |