[TIMOB-24628] Windows: Hyperloop Collections support with Generics

GitHub Issue	n/a
Type	Improvement
Priority	Medium
Status	Closed
Resolution	Duplicate
Resolution Date	2017-04-27T08:33:31.000+0000
Affected Version/s	Hyperloop 2.1.0
Fix Version/s	n/a
Components	Windows
Labels	hyperloop
Reporter	Kota Iguchi
Assignee	Kota Iguchi
Created	2017-04-26T04:05:19.000+0000
Updated	2017-04-27T08:33:31.000+0000

Description

On Hyperloop Windows, there's no way to handle collections with generics like IList<int>.

Platform::Collections::Vector<int>^ vec = ref new Platform::Collections::Vector<int>();
vec->Append(1);
vec->Append(2);

System.Collections.Generic.List<int> vec = new System.Collections.Generic.List<int>();
vec.Add(1);
vec.Add(2);

Comments

Hans Knöchel 2017-04-26

You have an idea about the syntax? iOS doesn't support generics as well, but I'm wondering how we would map those.

Kota Iguchi 2017-04-27

Syntax-wise, It turns out we can create generic instance work by just specifying generic parameter in require.

   var List = require('System.Collections.Generic.List<int>');
   var vec = new List();

But then vec.Add(123); fails now. So this ticket is for following issue. This might be a type conversion issue that is not related to generic type. We might want to change ticket description then.

   System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> 
   System.ArgumentException: The value "123" is not of type "System.Int32" and cannot be used in this generic collection.
   Parameter name: value
      at System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)
      at System.Collections.Generic.List`1.System.Collections.IList.Add(Object item)

Kota Iguchi 2017-04-27

ok, confirmed that we already support this by TIMOB-24637 using cast. So I would close this.

   var List = require('System.Collections.Generic.List<System.Int32>'),
       Int32 = require('System.Int32');
   
   var vec = new List();
   vec.Add(Int32.cast(1));
   vec.Add(Int32.cast(2));
   vec.Add(Int32.cast(3));
   
   alert(vec.Count);

JSON Source