/// <summary>
/// Converts the result to <see cref="Optional{T}"/>.
/// </summary>
/// <returns></returns>
public override Optional <T> ToOptional()
{
return(Optional.Some(Value));
}
} // MapPartial(, function)
/// <summary>
/// If the current instance has a value, calls <paramref name="function"/> on it and returns <c>Some</c> the result.
/// Otherwise returns <c>None</c>.
/// </summary>
/// <typeparam name="R">The return type of <paramref name="function"/>.</typeparam>
/// <param name="function">The function.</param>
public Optional <R> Map <R>(Func <T, R> function)
{
return(HasValue ? Optional.Some(function(_value)) : Optional <R> .None);
} // Map(, function)