n227.cpp

#include <iostream>
#include <string>
#include <type_traits>

namespace n227_radio_factory
{
    struct Capacitor
    {
        std::string capacitance;
    };

    struct Resistor
    {
        double resistance;
    };

    template <typename ComponentType, size_t BinCapacity, typename RequestPolicy = void>
    class ComponentBin
    {
    public:
        struct RequestForm
        {
            std::string description;
            int quantity_requested;
        };

        // Provide a default RequestPolicy if none is specified.
        template <typename U = RequestPolicy>
        typename std::enable_if<std::is_same_v<U, void>, ComponentType>::type
        retrieve(RequestForm const &request)
        {
            // Default policy: No special handling.
            // TODO: Implement the logic to retrieve the component based on the request for the default policy.
            return ComponentType{};
        }

        // Overload for custom RequestPolicy. This demonstrates using the third template argument.
        template <typename U = RequestPolicy>
        typename std::enable_if<!std::is_same_v<U, void>, ComponentType>::type
        retrieve(RequestForm const &request)
        {
            // Apply the custom RequestPolicy.
            return RequestPolicy::handle(request);
        }

        static constexpr size_t capacity() { return BinCapacity; }
    };

    // Example of a custom RequestPolicy - demonstrates the third template argument.
    struct SeniorStaffOnlyPolicy
    {
        static Resistor handle(const ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy>::RequestForm &request)
        {
            // Simulate a check if the requester has the required seniority (not implemented).
            if (request.description.find("Urgent") != std::string::npos)
            {
                //  TODO: Implement the logic for senior staff to retrieve resistors, potentially overriding normal procedures.
                return Resistor{};
            }
            else
            {
                std::cout << "Request flagged for standard pro cessing." << std::endl;
                return {}; // Or some default/error handling
            }
        }
    };

    // Explicit instantiation for integers as ComponentType, a capacity of 5, and the default policy.
    // template int ComponentBin<int, 5>::retrieve(ComponentBin<int, 5>::RequestForm const &);

    template int n227_radio_factory::ComponentBin<int, 5, void>::retrieve<void>(n227_radio_factory::ComponentBin<int, 5, void>::RequestForm const&);

    // Explicit instantiation for Resistor, capacity of 10, and the SeniorStaffOnlyPolicy. Demonstrates the third template argument.
    // template Resistor ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy>::retrieve(ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy>::RequestForm const &);

    template n227_radio_factory::Resistor n227_radio_factory::ComponentBin<n227_radio_factory::Resistor, 10, n227_radio_factory::SeniorStaffOnlyPolicy>::retrieve<n227_radio_factory::SeniorStaffOnlyPolicy>(n227_radio_factory::ComponentBin<n227_radio_factory::Resistor, 10, n227_radio_factory::SeniorStaffOnlyPolicy>::RequestForm const&);

} // namespace n227_radio_factory

void run_tests()
{
    using namespace n227_radio_factory;

    // Test case 1: Integer bin with default policy
    ComponentBin<int, 5> int_bin;
    ComponentBin<int, 5>::RequestForm int_request = {"Needed for circuit A", 2};
    int retrieved_int = int_bin.retrieve(int_request);
    static_assert(std::is_same_v<decltype(retrieved_int), int>, "Test Case 1 Failed: Incorrect return type");
    // The actual value depends on the TODO implementation.

    // Test case 2: Resistor bin with SeniorStaffOnlyPolicy
    ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy> resistor_bin_senior;
    ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy>::RequestForm resistor_request_urgent = {"Urgent resistors for assembly line", 5};
    Resistor retrieved_resistor_senior_urgent = resistor_bin_senior.retrieve(resistor_request_urgent);
    static_assert(std::is_same_v<decltype(retrieved_resistor_senior_urgent), Resistor>, "Test Case 2 Failed: Incorrect return type");
    // The behavior depends on the TODO implementation within SeniorStaffOnlyPolicy.

    ComponentBin<Resistor, 10, SeniorStaffOnlyPolicy>::RequestForm resistor_request_standard = {"Standard resistor request", 3};
    Resistor retrieved_resistor_senior_standard = resistor_bin_senior.retrieve(resistor_request_standard);
    static_assert(std::is_same_v<decltype(retrieved_resistor_senior_standard), Resistor>, "Test Case 2b Failed: Incorrect return type");

    // Test case 3: Capacitor bin with default policy (demonstrating a different ComponentType)
    ComponentBin<Capacitor, 20> capacitor_bin;
    ComponentBin<Capacitor, 20>::RequestForm capacitor_request = {"Capacitors for filtering", 10};
    Capacitor retrieved_capacitor = capacitor_bin.retrieve(capacitor_request);
    static_assert(std::is_same_v<decltype(retrieved_capacitor), Capacitor>, "Test Case 3 Failed: Incorrect return type");
    // The actual content of the capacitor depends on the TODO implementation.

    // Static assert to check the bin capacity (demonstrates the second template argument).
    static_assert(ComponentBin<float, 100>::capacity() == 100, "Test Case 4 Failed: Incorrect capacity");
    static_assert(ComponentBin<Resistor, 50>::capacity() == 50, "Test Case 5 Failed: Incorrect capacity");
}

int main()
{
    std::cout << "Running Tests..." << std::endl;
    run_tests();
    std::cout << "Tests Complete." << std::endl;
    return 0;
}