How do I pattern match (std::visit) std::mdspan (proposals) in C++?

In C++, pattern matching can be effectively handled using std::visit in combination with std::mdspan from the proposals. This approach allows for seamless operations on variadic types while accessing multidimensional data efficiently.

Here is an example of how to use std::visit with std::mdspan:

#include #include #include #include namespace ex = std::experimental; int main() { using VariantType = std::variant; std::mdspan mspan = std::array{{1, 2, 3, 4, 5, 6}}; VariantType var = 10; // can be double or int auto visitor = [&mspan](auto value) { using T = std::decay_t; if constexpr (std::is_same_v) { std::cout << "Int value: " << value << std::endl; std::cout << "mdspan values: "; for (size_t i = 0; i < mspan.size(); ++i) { std::cout << mspan[i] << " "; } std::cout << std::endl; } else if constexpr (std::is_same_v) { std::cout << "Double value: " << value << std::endl; } }; std::visit(visitor, var); return 0; }

C++ std::visit std::mdspan pattern matching multidiensional arrays

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