// ===========================================================================
// Operator Overloading
// ===========================================================================
#include <iostream>
#include <cstdlib>
using namespace std;
// class definition of MyVector
class MyVector
{
friend const MyVector operator+(const MyVector& v, double d);
private:
int n;
double* m;
public:
MyVector();
MyVector(int n, double m[]);
MyVector(const MyVector& v);
~MyVector();
void print() const;
bool operator==(const MyVector& v) const;
bool operator!=(const MyVector& v) const;
bool operator<(const MyVector& v) const;
double operator[](int i) const;
double& operator[](int i);
const MyVector& operator=(const MyVector& v);
const MyVector& operator+=(const MyVector& v);
};
// end of class definition of MyVector
// global function headers
const MyVector operator+(const MyVector& v, double d);
const MyVector operator+(double d, const MyVector& v);
const MyVector operator+(const MyVector& v1, const MyVector& v2);
// MyVector's instance functions
MyVector::MyVector(): n(0), m(NULL)
{
}
MyVector::MyVector(int n, double m[])
{
this->n = n;
this->m = new double[n];
for(int i = 0; i < n; i++)
this->m[i] = m[i];
}
MyVector::MyVector(const MyVector& v)
{
this->n = v.n;
this->m = new double[n];
for(int i = 0; i < n; i++)
this->m[i] = v.m[i];
}
MyVector::~MyVector()
{
delete [] m;
}
void MyVector::print() const
{
cout << "(";
for(int i = 0; i < n - 1; i++)
cout << m[i] << ", ";
cout << m[n-1] << ")\n";
}
// end of MyVector's instance functions
// MyVector's overloaded operators
bool MyVector::operator==(const MyVector& v) const
{
if(this->n != v.n)
return false;
else
{
for(int i = 0; i < n; i++)
{
if(this->m[i] != v.m[i])
return false;
}
}
return true;
}
bool MyVector::operator!=(const MyVector& v) const
{
return !(*this == v);
}
bool MyVector::operator<(const MyVector& v) const
{
if(this->n != v.n)
return false;
else
{
for(int i = 0; i < n; i++)
{
if(this->m[i] >= v.m[i])
return false;
}
}
return true;
}
double MyVector::operator[](int i) const
{
if(i < 0 || i >= n)
exit(1);
return m[i];
}
double& MyVector::operator[](int i)
{
if(i < 0 || i >= n)
exit(1);
return m[i];
}
const MyVector& MyVector::operator=(const MyVector& v)
{
if(this != &v)
{
if(this->n != v.n)
{
delete [] this->m;
this->n = v.n;
this->m = new double[this->n];
}
for(int i = 0; i < n; i++)
this->m[i] = v.m[i];
}
return *this;
}
const MyVector& MyVector::operator+=(const MyVector& v)
{
if(this->n == v.n)
{
for(int i = 0; i < n; i++)
this->m[i] += v.m[i];
}
return *this;
}
// end of MyVector's overloaded operators
// global functions
const MyVector operator+(const MyVector& v, double d)
{
MyVector sum(v);
for(int i = 0; i < v.n; i++)
sum[i] += d;
return sum;
}
const MyVector operator+(double d, const MyVector& v)
{
return v + d;
}
const MyVector operator+(const MyVector& v1, const MyVector& v2)
{
MyVector sum(v1);
sum += v2;
return sum;
}
// end of global functions
// ===========================================================================
