/// <summary>
/// Serves as a hash function for the specified symbol.
/// </summary>
/// <returns>A hash code for the specified symbol.</returns>
/// <param name="obj">The symbol for which to get a hash code.</param>
/// <exception cref="ArgumentNullException"><paramref name="obj"/> is <c>null</c>.</exception>
public override int GetHashCode(TSymbol obj)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (Default.Equals(obj, default(TSymbol)))
{
return(0);
}
int hashCode = Hash.Create(MetadataName.GetHashCode(obj.MetadataName));
INamedTypeSymbol t = obj.ContainingType;
if (t != null)
{
hashCode = Combine(t);
t = t.ContainingType;
while (t != null)
{
hashCode = Hash.Combine(MetadataName.PlusHashCode, hashCode);
hashCode = Combine(t);
t = t.ContainingType;
}
}
INamespaceSymbol n = obj.ContainingNamespace;
if (n != null)
{
hashCode = Combine(n);
n = n.ContainingNamespace;
while (n != null)
{
hashCode = Hash.Combine(MetadataName.DotHashCode, hashCode);
hashCode = Combine(n);
n = n.ContainingNamespace;
}
}
return(hashCode);
int Combine(ISymbol symbol)
{
return(Hash.Combine(MetadataName.GetHashCode(symbol.MetadataName), hashCode));
}
}
public MetadataNameSet(IEnumerable <string> values)
: this(values.Select(f => MetadataName.Parse(f)))
{
}
