70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
// twoswap.cpp -- specialization overrides a template
|
|
#include <iostream>
|
|
template <typename T>
|
|
void Swap(T &a, T &b);
|
|
|
|
struct job
|
|
{
|
|
char name[40];
|
|
double salary;
|
|
int floor;
|
|
};
|
|
|
|
// explicit specialization
|
|
template <> void Swap<job>(job &j1, job &j2);
|
|
void Show(job &j);
|
|
|
|
int main()
|
|
{
|
|
using namespace std;
|
|
cout.precision(2);
|
|
cout.setf(ios::fixed, ios::floatfield);
|
|
int i = 10, 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";
|
|
|
|
job sue = {"Susan Yaffee", 73000.60, 7};
|
|
job sidney = {"Sidney Taffee", 78060.72, 9};
|
|
cout << "Before job swapping:\n";
|
|
Show(sue);
|
|
Show(sidney);
|
|
Swap(sue, sidney); // uses void Swap(job &, job &)
|
|
cout << "After job swapping:\n";
|
|
Show(sue);
|
|
Show(sidney);
|
|
// cin.get();
|
|
return 0;
|
|
}
|
|
|
|
template <typename T>
|
|
void Swap(T &a, T &b) // general version
|
|
{
|
|
T temp;
|
|
temp = a;
|
|
a = b;
|
|
b = temp;
|
|
}
|
|
|
|
// swaps just the salary and floor fields of a job structure
|
|
|
|
template <> void Swap<job>(job &j1, job &j2) // specialization
|
|
{
|
|
double t1;
|
|
int t2;
|
|
t1 = j1.salary;
|
|
j1.salary = j2.salary;
|
|
j2.salary = t1;
|
|
t2 = j1.floor;
|
|
j1.floor = j2.floor;
|
|
j2.floor = t2;
|
|
}
|
|
|
|
void Show(job &j)
|
|
{
|
|
using namespace std;
|
|
cout << j.name << ": $" << j.salary
|
|
<< " on floor " << j.floor << endl;
|
|
}
|