How do I reflect over tuples and structs with visit in C++?

In modern C++, reflecting over tuples and structs can be achieved using the `std::visit` function in combination with `std::variant`. This allows you to process the members of a struct or the elements of a tuple in a generic manner. Below is an example illustrating how to use `std::visit` to reflect over a tuple and a struct.

#include <iostream> #include <variant> #include <tuple> // Define a struct struct MyStruct { int a; double b; }; // Visitor to handle types struct Visitor { void operator()(int i) const { std::cout << "int: " << i << std::endl; } void operator()(double d) const { std::cout << "double: " << d << std::endl; } void operator()(const MyStruct& s) const { std::cout << "MyStruct: a = " << s.a << ", b = " << s.b << std::endl; } }; int main() { // Create a tuple of different types auto myTuple = std::make_tuple(42, 3.14, MyStruct{10, 2.71}); // Visit each element in the tuple std::apply([](auto&&... args) { (Visitor{}(args), ...); }, myTuple); return 0; }

Reflecting over tuples C++ visit example std::variant std::tuple generic programming C++ struct reflection

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