C++関数ライブラリの詳細説明：システム関数拡張とコード再構築

#include <list>

template <typename T>
struct Node {
    T value;
    Node* next;
    Node* prev;
};

class DoubleLinkedList {
public:
    DoubleLinkedList() : head(nullptr), tail(nullptr) {}
    
    void add_back(const T& value) {
        auto new_node = new Node<T>{value, nullptr, nullptr};
        if (head == nullptr) {
            head = new_node;
            tail = new_node;
        } else {
            tail->next = new_node;
            new_node->prev = tail;
            tail = new_node;
        }
    }
    
    void remove(Node<T>* node) {
        if (node == head) {
            head = node->next;
        } else if (node == tail) {
            tail = node->prev;
        } else {
            node->prev->next = node->next;
            node->next->prev = node->prev;
        }
        delete node;
    }
    
private:
    Node<T>* head;
    Node<T>* tail;
};

#include <boost/regex.hpp>

boost::regex r("ab*c");

bool is_match(const std::string& input) {
    return boost::regex_match(input, r);
}

#include <QtWidgets>

class MainWindow : public QMainWindow {
public:
    MainWindow() { ... }
};

int main(int argc, char** argv) {
    QApplication app(argc, argv);
    MainWindow window;
    window.show();
    return app.exec();
}

#include <apollo/control/controller.h>

apollo::control::Controller controller(...);

void control_vehicle() {
    auto command = controller.compute_control_command(sensor_data);
    send_control_command(command);
}