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Commit537ddf4

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allow casting objects to generic .NET interfaces without specifying generic arguments as long as there is no ambiguity
1 parentf48d7a9 commit537ddf4

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2 files changed

+50
-0
lines changed

2 files changed

+50
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lines changed

‎CHANGELOG.md

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@@ -21,6 +21,7 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
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-`__name__` and`__signature__` to reflected .NET methods
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- .NET collection types now implement standard Python collection interfaces from`collections.abc`.
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See[Mixins/collections.py](src/runtime/Mixins/collections.py).
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- you can cast objects to generic .NET interfaces without specifying generic arguments as long as there is no ambiguity.
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- .NET arrays implement Python buffer protocol
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- Python integer interoperability with`System.Numerics.BigInteger`
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- Python.NET will correctly resolve .NET methods, that accept`PyList`,`PyInt`,

‎src/runtime/Types/GenericType.cs

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@@ -1,4 +1,5 @@
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usingSystem;
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usingSystem.Linq;
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namespacePython.Runtime
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{
@@ -20,10 +21,58 @@ internal GenericType(Type tp) : base(tp)
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/// </summary>
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publicstaticNewReferencetp_new(BorrowedReferencetp,BorrowedReferenceargs,BorrowedReferencekw)
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{
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varself=(GenericType)GetManagedObject(tp)!;
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if(!self.type.Valid)
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{
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returnExceptions.RaiseTypeError(self.type.DeletedMessage);
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}
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vartype=self.type.Value;
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if(type.IsInterface&&!type.IsConstructedGenericType)
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{
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varnargs=Runtime.PyTuple_Size(args);
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if(nargs==1)
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{
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varinstance=Runtime.PyTuple_GetItem(args,0);
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returnAsGenericInterface(instance,type);
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}
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}
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Exceptions.SetError(Exceptions.TypeError,"cannot instantiate an open generic type");
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returndefault;
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}
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staticNewReferenceAsGenericInterface(BorrowedReferenceinstance,TypetargetType)
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{
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if(GetManagedObject(instance)is notCLRObjectobj)
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{
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returnExceptions.RaiseTypeError("only .NET objects can be cast to .NET interfaces");
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}
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Type[]supportedInterfaces=obj.inst.GetType().GetInterfaces();
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Type[]constructedInterfaces=supportedInterfaces
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.Where(i=>i.IsConstructedGenericType&&i.GetGenericTypeDefinition()==targetType)
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.ToArray();
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if(constructedInterfaces.Length==1)
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{
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BorrowedReferencepythonic=ClassManager.GetClass(constructedInterfaces[0]);
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usingvarargs=Runtime.PyTuple_New(1);
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Runtime.PyTuple_SetItem(args.Borrow(),0,instance);
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returnRuntime.PyObject_CallObject(pythonic,args.Borrow());
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}
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if(constructedInterfaces.Length>1)
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{
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stringinterfaces=string.Join(", ",constructedInterfaces.Select(TypeManager.GetPythonTypeName));
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returnExceptions.RaiseTypeError("Ambiguous cast to .NET interface. "
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+$"Object implements:{interfaces}");
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}
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returnExceptions.RaiseTypeError("object does not implement "
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+TypeManager.GetPythonTypeName(targetType));
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}
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/// <summary>
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/// Implements __call__ for reflected generic types.

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