The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
#include <stddef.h>
#include <cassert>
template<typename T>
class SArray {
public:
// create array with initial size
explicit SArray (size_t s)
: storage(new T[s]), storage_size(s) {
init();
}
// copy constructor
SArray (SArray<T> const& orig)
: storage(new T[orig.size()]), storage_size(orig.size()) {
copy(orig);
}
// destructor: free memory
~SArray() {
delete[] storage;
}
// assignment operator
SArray<T>& operator= (SArray<T> const& orig) {
if (&orig!=this) {
copy(orig);
}
return *this;
}
// return size
size_t size() const {
return storage_size;
}
// index operator for constants and variables
T operator[] (size_t idx) const {
return storage[idx];
}
T& operator[] (size_t idx) {
return storage[idx];
}
protected:
// init values with default constructor
void init() {
for (size_t idx = 0; idx<size(); ++idx) {
storage[idx] = T();
}
}
// copy values of another array
void copy (SArray<T> const& orig) {
assert(size()==orig.size());
for (size_t idx = 0; idx<size(); ++idx) {
storage[idx] = orig.storage[idx];
}
}
private:
T* storage; // storage of the elements
size_t storage_size; // number of elements
public:
SArray<T>& operator+= (SArray<T> const& b);
SArray<T>& operator*= (SArray<T> const& b);
SArray<T>& operator*= (T const& s);
};