/// <summary>
/// Constructor
/// </summary>
/// <param name="roleAccessor">Role Property Accessor this instance will be returned by</param>
/// <param name="memberships">Other roles to participate in</param>
/// <param name="exclusions">Roles of which this role is excluded</param>
public RoleExpression(Expression<Func<IRole>> roleAccessor, IRole[] memberships, IRole[] exclusions)
{
Name = BindingHelper.Name(roleAccessor);
RoleMemberships = memberships.ToDictionary(r => r.Name);
RoleExclusions = exclusions.ToDictionary(r => r.Name);
}