public ConstraintValidatingSubstitution(IList<IType> classTypeArguments, IList<IType> methodTypeArguments, OverloadResolution overloadResolution)
: base(classTypeArguments, methodTypeArguments)
{
this.conversions = overloadResolution.conversions;
}
internal static bool ValidateConstraints(ITypeParameter typeParameter, IType typeArgument, TypeVisitor substitution, Conversions conversions)
{
switch (typeArgument.Kind) { // void, null, and pointers cannot be used as type arguments
case TypeKind.Void:
case TypeKind.Null:
case TypeKind.Pointer:
return false;
}
if (typeParameter.HasReferenceTypeConstraint) {
if (typeArgument.IsReferenceType != true)
return false;
}
if (typeParameter.HasValueTypeConstraint) {
if (!NullableType.IsNonNullableValueType(typeArgument))
return false;
}
if (typeParameter.HasDefaultConstructorConstraint) {
ITypeDefinition def = typeArgument.GetDefinition();
if (def != null && def.IsAbstract)
return false;
var ctors = typeArgument.GetConstructors(
m => m.Parameters.Count == 0 && m.Accessibility == Accessibility.Public,
GetMemberOptions.IgnoreInheritedMembers | GetMemberOptions.ReturnMemberDefinitions
);
if (!ctors.Any())
return false;
}
foreach (IType constraintType in typeParameter.DirectBaseTypes) {
IType c = constraintType;
if (substitution != null)
c = c.AcceptVisitor(substitution);
if (!conversions.IsConstraintConvertible(typeArgument, c))
return false;
}
return true;
}
public OverloadResolution(ICompilation compilation, ResolveResult[] arguments, string[] argumentNames = null, IType[] typeArguments = null, Conversions conversions = null)
{
if (compilation == null)
throw new ArgumentNullException("compilation");
if (arguments == null)
throw new ArgumentNullException("arguments");
if (argumentNames == null)
argumentNames = new string[arguments.Length];
else if (argumentNames.Length != arguments.Length)
throw new ArgumentException("argumentsNames.Length must be equal to arguments.Length");
this.compilation = compilation;
this.arguments = arguments;
this.argumentNames = argumentNames;
// keep explicitlyGivenTypeArguments==null when no type arguments were specified
if (typeArguments != null && typeArguments.Length > 0)
this.explicitlyGivenTypeArguments = typeArguments;
this.conversions = conversions ?? Conversions.Get(compilation);
this.AllowExpandingParams = true;
}
