/// <summary>
/// Returns the value of <paramref name="source"/> if it is not empty, otherwise throws an exception created from the function provided.
/// </summary>
/// <typeparam name="T">The sub-type of the Maybe{T} instances.</typeparam>
/// <param name="source">The Mabye{T} instance whose value is returned if it is not empty.</param>
/// <param name="exceptionFactory">A function that builds the exception to be thrown if <paramref name="source"/> is empty. If the function is null or returns null, a <see cref="System.InvalidOperationException"/> is thrown.</param>
/// <returns>The value of <paramref name="source"/>.</returns>
public static T ValueOrException <T>(this Maybe <T> source, Func <Exception> exceptionFactory)
{
if (source.IsEmpty)
{
throw exceptionFactory?.Invoke() ?? Maybe <T> .CreateEmptyException();
}
return(source.Value);
}
/// <summary>
/// Returns the value of <paramref name="source"/> if it is not empty, otherwise throws the provided exception.
/// </summary>
/// <typeparam name="T">The sub-type of the Maybe{T} instances.</typeparam>
/// <param name="source">The Mabye{T} instance whose value is returned if it is not empty.</param>
/// <param name="exception">The exception to throw if <paramref name="source"/> is empty. If null, an <see cref="System.InvalidOperationException"/> is thrown.</param>
/// <returns>The value of <paramref name="source"/>.</returns>
public static T ValueOrException <T>(this Maybe <T> source, Exception exception)
{
if (source.IsEmpty)
{
throw exception ?? Maybe <T> .CreateEmptyException();
}
return(source.Value);
}
