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Merged
lostmsu merged 2 commits into from
Oct 12, 2020
Merged

Make len work for ICollection<> interface objects #1253

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3f8def7
Make `len` work for `ICollection<>` interface objects
danabr Oct 6, 2020
3c267c6
Fix typo
danabr Oct 9, 2020
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Make len work for ICollection<> interface objects
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@danabr
danabr committed Oct 9, 2020
commit 3f8def796af3827b8e5fde0aebd6bf948b0165ac
1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -31,6 +31,7 @@ details about the cause of the failure
- Fix non-delegate types incorrectly appearing as callable.
- Indexers can now be used with interface objects
- Fixed a bug where indexers could not be used if they were inherited
- Made it possible to use `__len__` also on `ICollection<>` interface objects

## [2.5.0][] - 2020-06-14

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4 changes: 4 additions & 0 deletions src/runtime/slots/mp_length.cs
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Expand Up @@ -36,6 +36,10 @@ public static bool CanAssgin(Type clrType)
{
return true;
}
if (clrType.IsInterface && clrType.IsGenericType && clrType.GetGenericTypeDefinition() == typeof(ICollection<>))
{
return true;
}
return false;
}

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14 changes: 14 additions & 0 deletions src/tests/test_mp_length.py
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Expand Up @@ -47,3 +47,17 @@ def test_custom_generic_collection_explicit___len__():
s.Add(1)
s.Add(10)
assert len(s) == 2

def test_len_through_interface_generic():
"""Test __len__ for ICollection<T>"""
import System.Collections.Generic
l = System.Collections.Generic.List[int]()
coll = System.Collections.Generic.ICollection[int](l)
assert len(coll) == 0

def test_len_through_interface():
"""Test __len__ for ICollection"""
import System.Collections
l = System.Collections.ArrayList()
coll = System.Collections.ICollection(l)
assert len(coll) == 0