Deconstruction is ambiguous





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I have a vector class with two deconstruction methods as follows:



public readonly struct Vector2
{
public readonly double X, Y;

...

public void Deconstruct( out double x, out double y )
{
x = this.X;
y = this.Y;
}

public void Deconstruct( out Vector2 unitVector, out double length )
{
length = this.Length;
unitVector = this / length;
}
}


Somewhere else I have:



Vector2 foo = ...
(Vector2 dir, double len) = foo;


This gives me:



CS0121: The call is ambiguous between the following methods or properties: 'Vector2.Deconstruct(out double, out double)' and 'Vector2.Deconstruct(out Vector2, out double)'


How is this ambiguous?



Edit: Calling Deconstruct manually works fine:



foo.Deconstruct( out Vector2 dir, out double len );









share|improve this question

























  • If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

    – Ian Mercer
    3 hours ago


















6















I have a vector class with two deconstruction methods as follows:



public readonly struct Vector2
{
public readonly double X, Y;

...

public void Deconstruct( out double x, out double y )
{
x = this.X;
y = this.Y;
}

public void Deconstruct( out Vector2 unitVector, out double length )
{
length = this.Length;
unitVector = this / length;
}
}


Somewhere else I have:



Vector2 foo = ...
(Vector2 dir, double len) = foo;


This gives me:



CS0121: The call is ambiguous between the following methods or properties: 'Vector2.Deconstruct(out double, out double)' and 'Vector2.Deconstruct(out Vector2, out double)'


How is this ambiguous?



Edit: Calling Deconstruct manually works fine:



foo.Deconstruct( out Vector2 dir, out double len );









share|improve this question

























  • If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

    – Ian Mercer
    3 hours ago














6












6








6


0






I have a vector class with two deconstruction methods as follows:



public readonly struct Vector2
{
public readonly double X, Y;

...

public void Deconstruct( out double x, out double y )
{
x = this.X;
y = this.Y;
}

public void Deconstruct( out Vector2 unitVector, out double length )
{
length = this.Length;
unitVector = this / length;
}
}


Somewhere else I have:



Vector2 foo = ...
(Vector2 dir, double len) = foo;


This gives me:



CS0121: The call is ambiguous between the following methods or properties: 'Vector2.Deconstruct(out double, out double)' and 'Vector2.Deconstruct(out Vector2, out double)'


How is this ambiguous?



Edit: Calling Deconstruct manually works fine:



foo.Deconstruct( out Vector2 dir, out double len );









share|improve this question
















I have a vector class with two deconstruction methods as follows:



public readonly struct Vector2
{
public readonly double X, Y;

...

public void Deconstruct( out double x, out double y )
{
x = this.X;
y = this.Y;
}

public void Deconstruct( out Vector2 unitVector, out double length )
{
length = this.Length;
unitVector = this / length;
}
}


Somewhere else I have:



Vector2 foo = ...
(Vector2 dir, double len) = foo;


This gives me:



CS0121: The call is ambiguous between the following methods or properties: 'Vector2.Deconstruct(out double, out double)' and 'Vector2.Deconstruct(out Vector2, out double)'


How is this ambiguous?



Edit: Calling Deconstruct manually works fine:



foo.Deconstruct( out Vector2 dir, out double len );






c# c#-7.3






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share|improve this question








edited 4 hours ago







Chris

















asked 4 hours ago









ChrisChris

4,7381025




4,7381025













  • If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

    – Ian Mercer
    3 hours ago



















  • If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

    – Ian Mercer
    3 hours ago

















If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

– Ian Mercer
3 hours ago





If your Vector class had implicit conversion to/from a double, say, then this would be ambiguous.

– Ian Mercer
3 hours ago












1 Answer
1






active

oldest

votes


















7














This is by design in C#. Overloads of Deconstruct must have different arity (number of parameters), otherwise they are ambiguous.




Pattern-matching does not have a left-hand-side. More elaborate
pattern-matching scheme is to have a parenthesized list of patterns to
match, and we use the number of patterns to decide which Deconstruct
to use
.
- Neal Gafter https://github.com/dotnet/csharplang/issues/1998#issuecomment-438472660







share|improve this answer





















  • 1





    That is thoroughly disappointing!

    – Chris
    3 hours ago












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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









7














This is by design in C#. Overloads of Deconstruct must have different arity (number of parameters), otherwise they are ambiguous.




Pattern-matching does not have a left-hand-side. More elaborate
pattern-matching scheme is to have a parenthesized list of patterns to
match, and we use the number of patterns to decide which Deconstruct
to use
.
- Neal Gafter https://github.com/dotnet/csharplang/issues/1998#issuecomment-438472660







share|improve this answer





















  • 1





    That is thoroughly disappointing!

    – Chris
    3 hours ago
















7














This is by design in C#. Overloads of Deconstruct must have different arity (number of parameters), otherwise they are ambiguous.




Pattern-matching does not have a left-hand-side. More elaborate
pattern-matching scheme is to have a parenthesized list of patterns to
match, and we use the number of patterns to decide which Deconstruct
to use
.
- Neal Gafter https://github.com/dotnet/csharplang/issues/1998#issuecomment-438472660







share|improve this answer





















  • 1





    That is thoroughly disappointing!

    – Chris
    3 hours ago














7












7








7







This is by design in C#. Overloads of Deconstruct must have different arity (number of parameters), otherwise they are ambiguous.




Pattern-matching does not have a left-hand-side. More elaborate
pattern-matching scheme is to have a parenthesized list of patterns to
match, and we use the number of patterns to decide which Deconstruct
to use
.
- Neal Gafter https://github.com/dotnet/csharplang/issues/1998#issuecomment-438472660







share|improve this answer















This is by design in C#. Overloads of Deconstruct must have different arity (number of parameters), otherwise they are ambiguous.




Pattern-matching does not have a left-hand-side. More elaborate
pattern-matching scheme is to have a parenthesized list of patterns to
match, and we use the number of patterns to decide which Deconstruct
to use
.
- Neal Gafter https://github.com/dotnet/csharplang/issues/1998#issuecomment-438472660








share|improve this answer














share|improve this answer



share|improve this answer








edited 3 hours ago

























answered 3 hours ago









AsikAsik

14.4k349105




14.4k349105








  • 1





    That is thoroughly disappointing!

    – Chris
    3 hours ago














  • 1





    That is thoroughly disappointing!

    – Chris
    3 hours ago








1




1





That is thoroughly disappointing!

– Chris
3 hours ago





That is thoroughly disappointing!

– Chris
3 hours ago




















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