/// <summary>
/// Equality is based on an exact match of <see cref="Kind"/> and <see cref="NullableProfile"/>
/// but also handles the case when one of the two is oblivious of NRT and the other is <see cref="NullablityTypeKindExtension.IsNRTFullNullable(NullabilityTypeKind)"/>.
/// </summary>
/// <param name="other">The other info.</param>
/// <returns>True if this is equal to other, false otherwise.</returns>
public bool Equals(NullabilityTypeInfo other)
{
Debug.Assert(Kind != other.Kind || ((_profile == null) == (other._profile == null)), "If Kind are equals then both have a profile or not.");
// Strict equality.
if (Kind == other.Kind &&
(_profile == null || _profile.SequenceEqual(other._profile !)))
{
return(true);
}
// Basic type properties must be the same.
if ((Kind & (~NullabilityTypeKind.NRTFullNonNullable | NullabilityTypeKind.NRTFullNullable)) != (other.Kind & (~NullabilityTypeKind.NRTFullNonNullable | NullabilityTypeKind.NRTFullNullable)))
{
return(false);
}
// If this is a Full NRT nullable and the other is not NRT aware it is necessarily nullable since this is a reference type and
// other has the same basic type kind, it is nullable by default.
if (Kind.IsNRTFullNullable() && !other.Kind.IsNRTAware())
{
Debug.Assert(other.Kind.IsReferenceType() && other.Kind.IsNullable());
return(true);
}
// Reverse the previous check.
if (other.Kind.IsNRTFullNullable() && !Kind.IsNRTAware())
{
Debug.Assert(Kind.IsReferenceType() && Kind.IsNullable());
return(true);
}
return(false);
}
