Operator = 1

[Guest_imported]

Why it is inpossible to override operator = in C# like C++ ?

public static void operator = ( MyType mtRight )
{
   ...
}

Thanks

 

[JurkMonkey]

try overriding .Equals()

 

[Guest_imported]

Is overriding .Equals() will be call ?
If I'm doing :

MyType mt = new MyType;
if (mt == mt)
{
 ...
}

Thanks

 

[Guest_imported]

---> Forgot my last message <---
We cannot edit our message in this forum ?


Overriding .Equals() will not be call if I'm doing :

// Assign another MyType value
MyType mt1 = new MyType();
MyType mt2 = mt1;

// Assign an INT value
int p = 0;
MyType mt3 = p;

But I want to override the operator "=" assignation.
Thanks

 

[NeilTrain]

Operators Overloadability

+, -, *, /, %, &, |, <<, >> All C# binary operators can be overloaded.

+, -, !, ~, ++, --, true, false All C# unary operators can be overloaded.

==, !=, <, >, <= , >= All relational operators can be overloaded,
but only as pairs.

&&, || They can't be overloaded

() (Conversion operator) They can't be overloaded

+=, -=, *=, /=, %= These compound assignment operators can be
overloaded. But in C#, these operators are
automatically overloaded when the respective
binary operator is overloaded.

=, . , ?:, ->, new, is, as, sizeof These operators can't be overloaded

- Neil

 

[Guru7777]

Some examples

public static bool operator ==(ThreeDPoint a, ThreeDPoint b)
{
    // If both are null, or both are same instance, return true.
    if (System.Object.ReferenceEquals(a, b))
    {
        return true;
    }

    // If one is null, but not both, return false.
    if (((object)a == null) || ((object)b == null))
    {
        return false;
    }

    // Return true if the fields match:
    return a.x == b.x && a.y == b.y && a.z == b.z;
}

public static bool operator !=(ThreeDPoint a, ThreeDPoint b)
{
    return !(a == b);
}

I don't believe that you can do equals as = you have to do it as below.

public override bool Equals(System.Object obj)
    {
        // If parameter cannot be cast to ThreeDPoint return false:
        ThreeDPoint p = obj as ThreeDPoint;
        if ((object)p == null)
        {
            return false;
        }

        // Return true if the fields match:
        return base.Equals(obj) && z == p.z;
    }

    public bool Equals(ThreeDPoint p)
    {
        // Return true if the fields match:
        return base.Equals((TwoDPoint)p) && z == p.z;
    }

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TWljcm8kb2Z0J3MgIzEgRmFuIQ==

 

[Guest_imported]

Thank.

Really great answer