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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.TypeSystem
{
/// <summary>
/// Type parameter of a generic class/method.
/// </summary>
public interface IUnresolvedTypeParameter : INamedElement
{
/// <summary>
/// Get the type of this type parameter's owner.
/// </summary>
/// <returns>EntityType.TypeDefinition or EntityType.Method</returns>
EntityType OwnerType { get; }
/// <summary>
/// Gets the index of the type parameter in the type parameter list of the owning method/class.
/// </summary>
int Index { get; }
/// <summary>
/// Gets the list of attributes declared on this type parameter.
/// </summary>
IList<IUnresolvedAttribute> Attributes { get; }
/// <summary>
/// Gets the variance of this type parameter.
/// </summary>
VarianceModifier Variance { get; }
/// <summary>
/// Gets the region where the type parameter is defined.
/// </summary>
DomRegion Region { get; }
ITypeParameter CreateResolvedTypeParameter(ITypeResolveContext context);
}
/// <summary>
/// Type parameter of a generic class/method.
/// </summary>
public interface ITypeParameter : IType
{
/// <summary>
/// Get the type of this type parameter's owner.
/// </summary>
/// <returns>EntityType.TypeDefinition or EntityType.Method</returns>
EntityType OwnerType { get; }
/// <summary>
/// Gets the owning method/class.
/// This property may return null (for example for the dummy type parameters used by <see cref="ParameterListComparer.NormalizeMethodTypeParameters"/>).
/// </summary>
/// <remarks>
/// For "class Outer<T> { class Inner {} }",
/// inner.TypeParameters[0].Owner will be the outer class, because the same
/// ITypeParameter instance is used both on Outer`1 and Outer`1+Inner.
/// </remarks>
IEntity Owner { get; }
/// <summary>
/// Gets the index of the type parameter in the type parameter list of the owning method/class.
/// </summary>
int Index { get; }
/// <summary>
/// Gets the list of attributes declared on this type parameter.
/// </summary>
IList<IAttribute> Attributes { get; }
/// <summary>
/// Gets the variance of this type parameter.
/// </summary>
VarianceModifier Variance { get; }
/// <summary>
/// Gets the region where the type parameter is defined.
/// </summary>
DomRegion Region { get; }
/// <summary>
/// Gets the effective base class of this type parameter.
/// </summary>
IType EffectiveBaseClass { get; }
/// <summary>
/// Gets the effective interface set of this type parameter.
/// </summary>
IList<IType> EffectiveInterfaceSet { get; }
/// <summary>
/// Gets if the type parameter has the 'new()' constraint.
/// </summary>
bool HasDefaultConstructorConstraint { get; }
/// <summary>
/// Gets if the type parameter has the 'class' constraint.
/// </summary>
bool HasReferenceTypeConstraint { get; }
/// <summary>
/// Gets if the type parameter has the 'struct' constraint.
/// </summary>
bool HasValueTypeConstraint { get; }
}
/// <summary>
/// Represents the variance of a type parameter.
/// </summary>
public enum VarianceModifier : byte
{
/// <summary>
/// The type parameter is not variant.
/// </summary>
Invariant,
/// <summary>
/// The type parameter is covariant (used in output position).
/// </summary>
Covariant,
/// <summary>
/// The type parameter is contravariant (used in input position).
/// </summary>
Contravariant
};
}
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