/// <summary>
/// Initializes a new instance of the <see cref="IdEntity<TId>"/> class
/// copied from the specified <paramref name="entity"/>.
/// </summary>
/// <param name="entity">The entity.</param>
/// <exception cref="ArgumentNullException"><paramref name="entity"/> is null.</exception>
protected IdEntity(IdEntity <TId> entity) : base(entity)
{
_id = entity._id;
}
/// <summary>
/// Indicates whether the current entity <see cref="Id"/> is equal to another entity <see cref="Id"/>.
/// </summary>
/// <param name="other">An entity to compare with this entity.</param>
/// <returns><c>true</c> if the current entity <see cref="Id"/> is equal to the <paramref name="other"/> parameter; otherwise, <c>false</c>.</returns>
public bool Equals(IdEntity <TId> other)
{
return(ReferenceEquals(this, other) ||
(other != null &&
object.Equals(Id, other.Id)));
}