模版

#include <iostream>
using namespace std;

template<int Size>
class Index
{
    public:
        int operator[](char vchar) 
        { return vchar % Size; }
};

int main()
{
    Index<26> index;
    cout << index[‘a‘] << endl;
}

#include <iostream>
using namespace std;

template<class Type>
class trie
{
    public:
        trie(Type val_1, Type val_2) : num_1(val_1), num_2(val_2) {}
        void print_sum() { cout << num_1 + num_2 << endl; }
    private:
        Type num_1, num_2;
};

int main()
{
    trie<int> tt(2, 5);
    tt.print_sum();
}

#include <iostream>
using namespace std;

template<class Type>
class trie
{
    public:
        Type num;
};
class Index
{
    public:
        int operator[](char vchar) 
        { return vchar % 26; }
};

int main()
{
    trie<Index> tt;
    cout << tt.num[‘a‘] << endl;
    cout << tt.num[‘z‘] << endl;
}

#include <iostream>
using namespace std;

template<class Type, int Size>
class trie
{
    public:
        Type num;
};

template<int Size>
class Index
{
    public:
        int operator[](char vchar) 
        { return vchar % Size; }
};

int main()
{
    trie<Index<26>, 26> t;
}

#include <iostream>
using namespace std;

template<class Type>
Type sum(Type num_1, Type num_2)
{
    return num_1 + num_2;
}
int main()
{
    cout << sum(2, 3) << endl;
    cout << sum(2.2, 3.0) << endl;
}