[Serializable]
public class ComplexArray
{
#region Attributes
/// <summary>
/// Array Size
/// </summary>
protected int m_iSize;
/// <summary>
/// Real part of the data
/// </summary>
protected double[] m_dReal;
/// <summary>
/// Imaginary part of the data
/// </summary>
protected double[] m_dImag;
#region Construction
/// <summary>
/// Default constructor
/// </summary>
public ComplexArray()
{
}
public override bool Equals(object o)
{
if (this == (ComplexArray)o)
return true;
else
return false;
}
public static bool operator ==(ComplexArray src1, ComplexArray src2)
{
if (src1.m_iSize != src2.m_iSize)
return false;
for (int ii = 0; ii < src1.m_iSize; ii++)
{
if (src1.Real[ii] != src2.Real[ii])
return false;
if (src1.Imag[ii] != src2.Imag[ii])
return false;
}
return true;
}
public static bool operator !=(ComplexArray src1, ComplexArray src2)
{
if (src1 == src2)
return false;
else
return true;
}
}
I have a created a class called complex array and intention of this class is to save real and imaginary numbers and different operators have been overloaded like +,*,!=,==
Assume some function returns the instance of this class.
ComplexArray array = GetValue();
I want to check whether the reference is valid or not...
if(array != null)
{
//proceed further....
}
Issue : When the value is checked against null value, the exception occurs, because internally != overloaded function calls the ==.
How to avoid this kind of situation in operator overloading? Or how to make the operator != or == to check for the null value and return the correct values(true or false)
如果可以以.NET Framework 4.0为目标,则System.Numerics.Complex看起来像您所需要的。
Inside the ==
and !=
overloaded operators (at the very top) put the following:
if (src1 == null || src2 == null)
return false;
By the way, I find your complex number implementation is kind of poor. You could use some ready example or at least read it through.
This can be done by this code:
public override bool Equals(object obj)
{
var other = obj as ComplexArray;
if(ReferenceEquals(other, null))
{
return false;
}
if(ReferenceEquals(this, other)
{
return true;
}
// ToDo: Do all other comparision beyond reference comparision.
}
Also within the == operator you have to check both sides:
public static bool operator ==(ComplexArray src1, ComplexArray src2)
{
if(ReferenceEquals(src1, null)
|| ReferenceEquals(src2, null))
{
return ReferenceEquals(src1, src2);
}
return src1.Equals(src2);
}
public static bool operator !=(ComplexArray src1, ComplexArray src2)
{
return !(src1 == src2);
}
And don't forget, if you override Equals()
you have also to override GetHashCode()
. A good pattern for doing can also be found on SO .
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.