funtemp.cpp

一本很好的C++学习的丛书！初学者必看的

// funtemp.cpp -- using a function template
#include <iostream>
// function template prototype
template <class Any>  // or typename Any
void Swap(Any &a, Any &b);

int main()
{
    using namespace std;
    int i = 10;
    int j = 20;
    cout << "i, j = " << i << ", " << j << ".\n";
    cout << "Using compiler-generated int swapper:\n";
    Swap(i,j);  // generates void Swap(int &, int &)
    cout << "Now i, j = " << i << ", " << j << ".\n";

    double x = 24.5;
    double y = 81.7;
    cout << "x, y = " << x << ", " << y << ".\n";
    cout << "Using compiler-generated double swapper:\n";
    Swap(x,y);  // generates void Swap(double &, double &)
    cout << "Now x, y = " << x << ", " << y << ".\n";

    return 0;
}

// function template definition
template <class Any>  // or typename Any
void Swap(Any &a, Any &b)
{
    Any temp;   // temp a variable of type Any
    temp = a;
    a = b;
    b = temp; 
}