#include <iostream>
using namespace std;

template<typename T>
struct TestStruct {
    T val;
    void print() {
        cout << "Generic: " << val << endl;
    }
};

// 全特化版本
template<>
struct TestStruct<int> {
    int val;
    void print() {
        cout << "Specialized int: " << val * 2 << endl;
    }
};

int main() {
    TestStruct<double> s1;
    s1.val = 3.14;
    s1.print();
    TestStruct<int> s2;
    s2.val = 5;
    s2.print();
    return 0;
}