How to enable c# 7?

Is there a setting somewhere? This code does not compile:

Code (CSharp):

1. transform.position.x = 5;

 

C# 7 won't make that code compile ...

Try something like this to make sure C# 7.2 is working:

Code (CSharp):

1. public static void NonMutatingMethod(in Vector3 v1)
2. {
3.     Debug.Log(v1.ToString());
4. }

 

Thanks for the tip. I was under the wrong assumption. Turns out C# 7 was actually enabled for me.

 

Is this supposed to work now with the new Roslyn compiler?
What did I miss? was the Transform class rewritten to return position struct by reference or something?

 

C# 7 enables you to declare ref-returns:

Code (CSharp):

1. public ref Vector3 Foo { get { return ref m_Foo; } };

that can be used like you want

Code (CSharp):

1. whatefer.Foo.x = 3;

it does NOT automagically convert unity API into ref-returns (i.e. transform.position is still by value)

for that, they first need to remove the old runtime and require C# 7 to be mandatory, then implement it. and only if they decide it's worth it and doesn't break existing stuff

 

Mutable/referenced structs can cause a lot of headaches. Plus, a lot of unity-related code strongly relies on the built-in structs like Vector3, Quaternion, Matrix4x4 not to be references.

 

I hate to say it, but that was one true benefit of UnityScript.

 

If you open project solution file using i.e. notepad and check <LangVersion>, it will show you 7.2, so I think it should be enabled.

 

And probably only.

 

Hi all i need help please

i got this

Code (CSharp):

1.  
2.     public int Ready = 0;
3.  
4.  
5. public ref int Got(){
6.         return ref Ready;
7.     }
8.  
9.  
10. // Start is called before the first frame update
11.     void Start()
12.     {
13.  
14.  
15.         int Action = Got();
16.  
17.         Action++;
18.  
19.         Debug.Log(Action.ToString());
20.         Debug.Log(Got().ToString());
21.    
22.     }

it's return log

0
1


i miss somethink's ?

 

If you are trying to increase Action and Ready at the same time, I think it should be:

Code (csharp):

1.  
2. ref int Action = ref Got();
3.  

Local refs should have a ref before the left and right sides:
https://blogs.msdn.microsoft.com/mazhou/2017/12/12/c-7-series-part-7-ref-returns/

What its weird is that I would expect the logs in your example to be:
1
0