PracticeDev/study_cpp/cpp_primer_source_code/Chapter 14/pairs.cpp

56 lines
1.3 KiB
C++

// pairs.cpp -- defining and using a Pair template
#include <iostream>
#include <string>
template <class T1, class T2>
class Pair
{
private:
T1 a;
T2 b;
public:
T1 & first();
T2 & second();
T1 first() const { return a; }
T2 second() const { return b; }
Pair(const T1 & aval, const T2 & bval) : a(aval), b(bval) { }
Pair() {}
};
template<class T1, class T2>
T1 & Pair<T1,T2>::first()
{
return a;
}
template<class T1, class T2>
T2 & Pair<T1,T2>::second()
{
return b;
}
int main()
{
using std::cout;
using std::endl;
using std::string;
Pair<string, int> ratings[4] =
{
Pair<string, int>("The Purpled Duck", 5),
Pair<string, int>("Jaquie's Frisco Al Fresco", 4),
Pair<string, int>("Cafe Souffle", 5),
Pair<string, int>("Bertie's Eats", 3)
};
int joints = sizeof(ratings) / sizeof (Pair<string, int>);
cout << "Rating:\t Eatery\n";
for (int i = 0; i < joints; i++)
cout << ratings[i].second() << ":\t "
<< ratings[i].first() << endl;
cout << "Oops! Revised rating:\n";
ratings[3].first() = "Bertie's Fab Eats";
ratings[3].second() = 6;
cout << ratings[3].second() << ":\t "
<< ratings[3].first() << endl;
// std::cin.get();
return 0;
}