上-48 函数模板 template

#include <iostream>

using namespace std;
template <typename T>
T abs(T x)
{
        return x < 0 ? -x:x;
}

int main()
{
        int n = -5;
        double d = -5.5;

        cout << abs(n) << endl;
        cout << abs(d) << endl;

        return 0;
}

ywx@yuweixian:~/yu/c++/shiping$ ./templ
5
5.5