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Solution: Dynamic Tuple Creation

Explore the process of dynamic tuple creation in C++ using advanced template concepts. Learn to implement a dynamicTuple class with perfect forwarding, type deduction, and fold expressions. Understand step-by-step how to append elements, retrieve values, and apply functions to tuple elements, enhancing your grasp of complex template programming.

Performing dynamic operations on tuples

Let’s execute the provided solution for the dynamic tuple creation challenge and observe the code output. Subsequently, we’ll dissect the code step by step.

C++ 17
template<typename... Types>
class dynamicTuple {
public:
template<typename... Args>
dynamicTuple(Args&&... args) : elements(std::forward<Args>(args)...) {}
template<std::size_t Index>
decltype(auto) get_value() {
return std::get<Index>(elements);
}
template<typename... Args>
auto append(Args&&... args) {
return dynamicTuple<Types..., decltype(std::declval<Args>())...>(
std::get<Types>(elements)..., std::forward<Args>(args)...
);
}
// Member function to apply a given function to each element
template<typename F>
void apply_function(F&& func) {
(func(std::get<Types>(elements)), ...);
}
private:
std::tuple<Types...> elements;
template<typename... Ts>
friend void access_private(dynamicTuple<Ts...>& container);
};
// Nonmember function to access private member of dynamicTuple
template<typename... Types>
void access_private(dynamicTuple<Types...>& container) {
std::cout << "Printing private member: ";
container.apply_function([](auto&& value) { std::cout << value << " "; });
std::cout << std::endl;
}
int main() {
dynamicTuple<int, double, std::string> container(42, 3.14, "Hello");
std::cout << "get_value at index 0: " << container.get_value<0>() << std::endl;
auto appendedContainer = container.append("World", 101);
std::cout << "Container: " << std::endl;
access_private(container);
std::cout << "Appended Container: " << std::endl;
access_private(appendedContainer);
return 0;
}

Explanation

Let’s go over how each code block works in the widget above.

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