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

In C++, std::visit is used to apply a visitor to the value of a variant type. However, pattern matching with std::span is not directly related to std::visit as it is primarily designed for handling std::variant types. Instead, you can utilize std::visit along with std::variant to work with a range of types that might include std::span.

Here is an example to demonstrate how to use std::visit with std::variant that includes different types, one of which could be std::span:


        #include 
        #include 
        #include 
        #include 

        using VariantType = std::variant>;

        void processVariant(const VariantType& var) {
            std::visit([](auto&& arg) {
                using T = std::decay_t;
                if constexpr (std::is_same_v) {
                    std::cout << "Integer: " << arg << std::endl;
                } else if constexpr (std::is_same_v>) {
                    std::cout << "Span: ";
                    for (auto& elem : arg) {
                        std::cout << elem << " ";
                    }
                    std::cout << std::endl;
                }
            }, var);
        }

        int main() {
            VariantType intVariant = 42;
            VariantType spanVariant = std::span(new int[3]{1, 2, 3}, 3);

            processVariant(intVariant);
            processVariant(spanVariant);

            delete[] std::get<:span>>(spanVariant).data(); // Clean-up
            return 0;
        }

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

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

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