public bool Equals(IType other)
{
DefaultTypeParameter p = other as DefaultTypeParameter;
if (p == null)
{
return(false);
}
return(ownerType == p.ownerType && index == p.index);
}
public bool Equals(IType other)
{
DefaultTypeParameter p = other as DefaultTypeParameter;
if (p == null)
{
return(false);
}
return(parent.Equals(p.parent) &&
index == p.index);
}
bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
{
DefaultTypeParameter o = other as DefaultTypeParameter;
return(o != null &&
this.attributes == o.attributes &&
this.constraints == o.constraints &&
this.flags == o.flags &&
this.ownerType == o.ownerType &&
this.index == o.index &&
this.variance == o.variance);
}
public void ArrayToEnumerable()
{
ITypeParameter tp = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
IType stringType = compilation.FindType(KnownTypeCode.String);
ITypeDefinition enumerableType = compilation.FindType(KnownTypeCode.IEnumerableOfT).GetDefinition();
bool success;
Assert.AreEqual(
new [] { stringType },
ti.InferTypeArguments(new [] { tp },
new [] { new ResolveResult(new ArrayType(compilation, stringType)) },
new [] { new ParameterizedType(enumerableType, new [] { tp }) },
out success));
Assert.IsTrue(success);
}
public void ArrayToEnumerable()
{
ITypeParameter tp = new DefaultTypeParameter(EntityType.Method, 0, "T");
IType stringType = KnownTypeReference.String.Resolve(ctx);
ITypeDefinition enumerableType = ctx.GetTypeDefinition(typeof(IEnumerable<>));
bool success;
Assert.AreEqual(
new [] { stringType },
ti.InferTypeArguments(new [] { tp },
new [] { new ResolveResult(new ArrayType(stringType)) },
new [] { new ParameterizedType(enumerableType, new [] { tp }) },
out success));
Assert.IsTrue(success);
}
public void ArrayToReadOnlyList()
{
ITypeParameter tp = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
IType stringType = compilation.FindType(KnownTypeCode.String);
ITypeDefinition readOnlyListType = compilation.FindType(KnownTypeCode.IReadOnlyListOfT).GetDefinition();
if (readOnlyListType == null)
Assert.Ignore(".NET 4.5 IReadOnlyList not available");
bool success;
Assert.AreEqual(
new [] { stringType },
ti.InferTypeArguments(new [] { tp },
new [] { new ResolveResult(new ArrayType(compilation, stringType)) },
new [] { new ParameterizedType(readOnlyListType, new [] { tp }) },
out success));
Assert.IsTrue(success);
}
public void EnumerableToArrayInContravariantType()
{
ITypeParameter tp = new DefaultTypeParameter(EntityType.Method, 0, "T");
IType stringType = KnownTypeReference.String.Resolve(ctx);
ITypeDefinition enumerableType = ctx.GetTypeDefinition(typeof(IEnumerable<>));
ITypeDefinition comparerType = ctx.GetTypeDefinition(typeof(IComparer<>));
var comparerOfIEnumerableOfString = new ParameterizedType(comparerType, new [] { new ParameterizedType(enumerableType, new [] { stringType} ) });
var comparerOfTpArray = new ParameterizedType(comparerType, new [] { new ArrayType(tp) });
bool success;
Assert.AreEqual(
new [] { stringType },
ti.InferTypeArguments(new [] { tp },
new [] { new ResolveResult(comparerOfIEnumerableOfString) },
new [] { comparerOfTpArray },
out success));
Assert.IsTrue(success);
}
public void ArrayToListWithArrayCovariance()
{
ITypeParameter tp = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
IType objectType = compilation.FindType(KnownTypeCode.Object);
IType stringType = compilation.FindType(KnownTypeCode.String);
ITypeDefinition listType = compilation.FindType(KnownTypeCode.IListOfT).GetDefinition();
// void M<T>(IList<T> a, T b);
// M(new string[0], new object());
bool success;
Assert.AreEqual(
new [] { objectType },
ti.InferTypeArguments(
new [] { tp },
new [] { new ResolveResult(new ArrayType(compilation, stringType)), new ResolveResult(objectType) },
new [] { new ParameterizedType(listType, new [] { tp }), (IType)tp },
out success));
Assert.IsTrue(success);
}
public void InferFromMethodReturnType()
{
// static void M<T>(Func<T> f) {}
// M(Console.ReadKey); // type inference produces ConsoleKeyInfo
var T = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
IType declType = compilation.FindType(typeof(Console));
var methods = new MethodListWithDeclaringType(declType, declType.GetMethods(m => m.Name == "ReadKey"));
var argument = new MethodGroupResolveResult(new TypeResolveResult(declType), "ReadKey", new[] { methods }, new IType[0]);
bool success;
Assert.AreEqual(
new [] { compilation.FindType(typeof(ConsoleKeyInfo)) },
ti.InferTypeArguments(new [] { T }, new [] { argument },
new [] { new ParameterizedType(compilation.FindType(typeof(Func<>)).GetDefinition(), new[] { T }) },
out success));
Assert.IsTrue(success);
}
public void CannotInferFromMethodParameterTypes()
{
// static void M<A, B>(Func<A, B> f) {}
// M(int.Parse); // type inference fails
var A = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "A");
var B = new DefaultTypeParameter(compilation, SymbolKind.Method, 1, "B");
IType declType = compilation.FindType(typeof(int));
var methods = new MethodListWithDeclaringType(declType, declType.GetMethods(m => m.Name == "Parse"));
var argument = new MethodGroupResolveResult(new TypeResolveResult(declType), "Parse", new[] { methods }, new IType[0]);
bool success;
ti.InferTypeArguments(new [] { A, B }, new [] { argument },
new [] { new ParameterizedType(compilation.FindType(typeof(Func<,>)).GetDefinition(), new[] { A, B }) },
out success);
Assert.IsFalse(success);
}
public void IEnumerableCovarianceWithDynamic()
{
ITypeParameter tp = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
var ienumerableOfT = new ParameterizedType(compilation.FindType(typeof(IEnumerable<>)).GetDefinition(), new[] { tp });
var ienumerableOfString = compilation.FindType(typeof(IEnumerable<string>));
var ienumerableOfDynamic = compilation.FindType(typeof(IEnumerable<ReflectionHelper.Dynamic>));
// static T M<T>(IEnumerable<T> x, IEnumerable<T> y) {}
// M(IEnumerable<dynamic>, IEnumerable<string>); -> should infer T=dynamic, no ambiguity
// See http://blogs.msdn.com/b/cburrows/archive/2010/04/01/errata-dynamic-conversions-and-overload-resolution.aspx
// for details.
bool success;
Assert.AreEqual(
new [] { SpecialType.Dynamic },
ti.InferTypeArguments(
new [] { tp },
new [] { new ResolveResult(ienumerableOfDynamic), new ResolveResult(ienumerableOfString) },
new [] { ienumerableOfT, ienumerableOfT },
out success));
Assert.IsTrue(success);
}
public void InferFromObjectAndFromNullLiteral()
{
// M<T>(T a, T b);
ITypeParameter tp = new DefaultTypeParameter(compilation, SymbolKind.Method, 0, "T");
// M(new object(), null);
bool success;
Assert.AreEqual(
new [] { compilation.FindType(KnownTypeCode.Object) },
ti.InferTypeArguments(new [] { tp },
new [] { new ResolveResult(compilation.FindType(KnownTypeCode.Object)), new ResolveResult(SpecialType.NullType) },
new [] { tp, tp },
out success));
Assert.IsTrue(success);
}
public void UnconstrainedTypeParameter()
{
ITypeParameter t = new DefaultTypeParameter(compilation, EntityType.TypeDefinition, 0, "T");
ITypeParameter t2 = new DefaultTypeParameter(compilation, EntityType.TypeDefinition, 1, "T2");
ITypeParameter tm = new DefaultTypeParameter(compilation, EntityType.Method, 0, "TM");
Assert.AreEqual(C.None, conversions.ImplicitConversion(SpecialType.NullType, t));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, compilation.FindType(KnownTypeCode.Object)));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, SpecialType.Dynamic));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, compilation.FindType(typeof(ValueType))));
Assert.AreEqual(C.IdentityConversion, conversions.ImplicitConversion(t, t));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t2, t));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, t2));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, tm));
Assert.AreEqual(C.None, conversions.ImplicitConversion(tm, t));
}
public void TypeParameterWithReferenceTypeConstraint()
{
ITypeParameter t = new DefaultTypeParameter(compilation, SymbolKind.TypeDefinition, 0, "T", hasReferenceTypeConstraint: true);
Assert.AreEqual(C.NullLiteralConversion, conversions.ImplicitConversion(SpecialType.NullType, t));
Assert.AreEqual(C.ImplicitReferenceConversion, conversions.ImplicitConversion(t, compilation.FindType(KnownTypeCode.Object)));
Assert.AreEqual(C.ImplicitReferenceConversion, conversions.ImplicitConversion(t, SpecialType.Dynamic));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, compilation.FindType(typeof(ValueType))));
}
public void TypeParameterWithClassConstraint()
{
ITypeParameter t = new DefaultTypeParameter(compilation, EntityType.TypeDefinition, 0, "T",
constraints: new[] { compilation.FindType(typeof(StringComparer)) });
Assert.AreEqual(C.NullLiteralConversion,
conversions.ImplicitConversion(SpecialType.NullType, t));
Assert.AreEqual(C.ImplicitReferenceConversion,
conversions.ImplicitConversion(t, compilation.FindType(KnownTypeCode.Object)));
Assert.AreEqual(C.ImplicitReferenceConversion,
conversions.ImplicitConversion(t, SpecialType.Dynamic));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, compilation.FindType(typeof(ValueType))));
Assert.AreEqual(C.ImplicitReferenceConversion,
conversions.ImplicitConversion(t, compilation.FindType(typeof(StringComparer))));
Assert.AreEqual(C.ImplicitReferenceConversion,
conversions.ImplicitConversion(t, compilation.FindType(typeof(IComparer))));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, compilation.FindType(typeof(IComparer<int>))));
Assert.AreEqual(C.ImplicitReferenceConversion,
conversions.ImplicitConversion(t, compilation.FindType(typeof(IComparer<string>))));
}
void AddConstraints(IEntity parentEntity, DefaultTypeParameter tp, GenericParameter g)
{
switch (g.Attributes & GenericParameterAttributes.VarianceMask) {
case GenericParameterAttributes.Contravariant:
tp.Variance = VarianceModifier.Contravariant;
break;
case GenericParameterAttributes.Covariant:
tp.Variance = VarianceModifier.Covariant;
break;
}
tp.HasDefaultConstructorConstraint = g.HasReferenceTypeConstraint;
tp.HasValueTypeConstraint = g.HasNotNullableValueTypeConstraint;
tp.HasDefaultConstructorConstraint = g.HasDefaultConstructorConstraint;
if (g.HasConstraints) {
foreach (TypeReference constraint in g.Constraints) {
tp.Constraints.Add(ReadTypeReference(constraint, entity: parentEntity));
}
}
}
public void ExpansiveInheritance()
{
SimpleProjectContent pc = new SimpleProjectContent();
DefaultTypeDefinition a = new DefaultTypeDefinition(pc, string.Empty, "A");
DefaultTypeDefinition b = new DefaultTypeDefinition(pc, string.Empty, "B");
// interface A<in U>
a.Kind = TypeKind.Interface;
a.TypeParameters.Add(new DefaultTypeParameter(EntityType.TypeDefinition, 0, "U") { Variance = VarianceModifier.Contravariant });
// interface B<X> : A<A<B<X>>> { }
DefaultTypeParameter x = new DefaultTypeParameter(EntityType.TypeDefinition, 0, "X");
b.TypeParameters.Add(x);
b.BaseTypes.Add(new ParameterizedType(a, new[] { new ParameterizedType(a, new [] { new ParameterizedType(b, new [] { x }) } ) }));
IType type1 = new ParameterizedType(b, new[] { KnownTypeReference.Double.Resolve(ctx) });
IType type2 = new ParameterizedType(a, new [] { new ParameterizedType(b, new[] { KnownTypeReference.String.Resolve(ctx) }) });
Assert.IsFalse(conversions.ImplicitConversion(type1, type2));
}
public void TypeParameterWithClassConstraint()
{
DefaultTypeParameter t = new DefaultTypeParameter(EntityType.TypeDefinition, 0, "T");
t.Constraints.Add(ctx.GetTypeDefinition(typeof(StringComparer)));
Assert.IsTrue(conversions.ImplicitConversion(SharedTypes.Null, t));
Assert.IsTrue(conversions.ImplicitConversion(t, KnownTypeReference.Object.Resolve(ctx)));
Assert.IsTrue(conversions.ImplicitConversion(t, SharedTypes.Dynamic));
Assert.IsFalse(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(ValueType))));
Assert.IsTrue(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(StringComparer))));
Assert.IsTrue(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(IComparer))));
Assert.IsFalse(conversions.ImplicitConversion(t, typeof(IComparer<int>).ToTypeReference().Resolve(ctx)));
Assert.IsTrue(conversions.ImplicitConversion(t, typeof(IComparer<string>).ToTypeReference().Resolve(ctx)));
}
public void TypeParameterWithInterfaceConstraint()
{
DefaultTypeParameter t = new DefaultTypeParameter(EntityType.TypeDefinition, 0, "T");
t.Constraints.Add(ctx.GetTypeDefinition(typeof(IList)));
Assert.IsFalse(conversions.ImplicitConversion(SharedTypes.Null, t));
Assert.IsTrue(conversions.ImplicitConversion(t, KnownTypeReference.Object.Resolve(ctx)));
Assert.IsTrue(conversions.ImplicitConversion(t, SharedTypes.Dynamic));
Assert.IsFalse(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(ValueType))));
Assert.IsTrue(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(IList))));
Assert.IsTrue(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(IEnumerable))));
}
public void UnconstrainedTypeParameter()
{
DefaultTypeParameter t = new DefaultTypeParameter(EntityType.TypeDefinition, 0, "T");
DefaultTypeParameter t2 = new DefaultTypeParameter(EntityType.TypeDefinition, 1, "T2");
DefaultTypeParameter tm = new DefaultTypeParameter(EntityType.Method, 0, "TM");
Assert.IsFalse(conversions.ImplicitConversion(SharedTypes.Null, t));
Assert.IsTrue(conversions.ImplicitConversion(t, KnownTypeReference.Object.Resolve(ctx)));
Assert.IsTrue(conversions.ImplicitConversion(t, SharedTypes.Dynamic));
Assert.IsFalse(conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(ValueType))));
Assert.IsTrue(conversions.ImplicitConversion(t, t));
Assert.IsFalse(conversions.ImplicitConversion(t2, t));
Assert.IsFalse(conversions.ImplicitConversion(t, t2));
Assert.IsFalse(conversions.ImplicitConversion(t, tm));
Assert.IsFalse(conversions.ImplicitConversion(tm, t));
}
public void TypeParameterWithValueTypeConstraint()
{
ITypeParameter t = new DefaultTypeParameter(compilation, EntityType.TypeDefinition, 0, "T", hasValueTypeConstraint: true);
Assert.AreEqual(C.None, conversions.ImplicitConversion(SpecialType.NullType, t));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, compilation.FindType(KnownTypeCode.Object)));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, SpecialType.Dynamic));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, compilation.FindType(typeof(ValueType))));
}
public void TypeParameterWithValueTypeConstraint()
{
DefaultTypeParameter t = new DefaultTypeParameter(EntityType.TypeDefinition, 0, "T");
t.HasValueTypeConstraint = true;
Assert.AreEqual(C.None, conversions.ImplicitConversion(SharedTypes.Null, t));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, KnownTypeReference.Object.Resolve(ctx)));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, SharedTypes.Dynamic));
Assert.AreEqual(C.BoxingConversion, conversions.ImplicitConversion(t, ctx.GetTypeDefinition(typeof(ValueType))));
}
public void TypeParameterWithInterfaceConstraint()
{
ITypeParameter t = new DefaultTypeParameter(compilation, SymbolKind.TypeDefinition, 0, "T",
constraints: new [] { compilation.FindType(typeof(IList)) });
Assert.AreEqual(C.None, conversions.ImplicitConversion(SpecialType.NullType, t));
Assert.AreEqual(C.BoxingConversion,
conversions.ImplicitConversion(t, compilation.FindType(KnownTypeCode.Object)));
Assert.AreEqual(C.BoxingConversion,
conversions.ImplicitConversion(t, SpecialType.Dynamic));
Assert.AreEqual(C.None, conversions.ImplicitConversion(t, compilation.FindType(typeof(ValueType))));
Assert.AreEqual(C.BoxingConversion,
conversions.ImplicitConversion(t, compilation.FindType(typeof(IList))));
Assert.AreEqual(C.BoxingConversion,
conversions.ImplicitConversion(t, compilation.FindType(typeof(IEnumerable))));
}
