如何实现C++中的泛型类？

#include <iostream>

template <typename T>
class GenericClass {
public:
    GenericClass(T value) : val(value) {}
    void print() {
        std::cout << "Value: " << val << std::endl;
    }
private:
    T val;
};

GenericClass<int> intClass(10);
GenericClass<std::string> strClass("Hello");

intClass.print();  // 输出：“Value：10”
strClass.print();  // 输出：“Value：Hello”

template <typename T>
class StudentArray {
public:
    StudentArray(size_t size) : arr(new T[size]) {}
    void add(T name, int index) {
        arr[index] = name;
    }
    void print() {
        for (size_t i = 0; i < size(); ++i) {
            std::cout << "Student " << (i + 1) << ": " << arr[i] << std::endl;
        }
    }
    size_t size() {
        return size_;
    }
private:
    T* arr;
    size_t size_;
};

int main() {
    StudentArray<std::string> names(5);

    names.add("John", 0);
    names.add("Jane", 1);
    names.add("Peter", 2);
    names.add("Susan", 3);
    names.add("Thomas", 4);

    names.print();
}