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I have a struct that (for the purposes of this question) pretty much mimics the built in Point type.
I need to check that it has been instantiated before using it. When it was Point, I could do this:
if (this.p == null) But that now generates the following error:
Operator '==' cannot be applied to operands of type 'ProportionPoint' and '<null>'
How can I compare my struct against null? Is there another way to check for instantiation?
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The only way you could determine if a struct was initialized would be to check each element within it to see if it matched what you considered an initialized value for that element should be.
Unlike classes, structs can be instantiated without using the New operator. If the New operator is not used, the fields remain unassigned and the object cannot be used until all the fields are initialized.
We can now modify every property of those variables without affecting the other object, because the Dog struct contains basic types, which are copied by value.
In C# a struct is a 'value type', which can't be null.
A struct is a value type - it's never null.
You can check against default(ProportionPoint), which is the default value of the struct (e.g. zero). However, for a point, it may be that the default value - the origin - is also a "valid" value.
Instead you could use a Nullable<ProportionPoint>.
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