PracticeDev/study_cpp/cpp_primer_source_code/Chapter 14/arraytp.h

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//arraytp.h -- Array Template
#ifndef ARRAYTP_H_
#define ARRAYTP_H_
#include <iostream>
#include <cstdlib>
template <class T, int n>
class ArrayTP
{
private:
T ar[n];
public:
ArrayTP() {};
explicit ArrayTP(const T & v);
virtual T & operator[](int i);
virtual T operator[](int i) const;
};
template <class T, int n>
ArrayTP<T,n>::ArrayTP(const T & v)
{
for (int i = 0; i < n; i++)
ar[i] = v;
}
template <class T, int n>
T & ArrayTP<T,n>::operator[](int i)
{
if (i < 0 || i >= n)
{
std::cerr << "Error in array limits: " << i
<< " is out of range\n";
std::exit(EXIT_FAILURE);
}
return ar[i];
}
template <class T, int n>
T ArrayTP<T,n>::operator[](int i) const
{
if (i < 0 || i >= n)
{
std::cerr << "Error in array limits: " << i
<< " is out of range\n";
std::exit(EXIT_FAILURE);
}
return ar[i];
}
#endif