/// <summary>
/// Applies the specified function on every item in the collection, from last to first, and stops when the function returns false.
/// </summary>
/// <param name="function"> The function. </param>
/// <returns> </returns>
/// <exception cref="ArgumentNullException">Thrown if the argument null.</exception>
public virtual bool ForEachWhile(Func <TElem, bool> function)
{
if (function == null)
{
throw Errors.Argument_null("function");
}
foreach (var item in this)
{
if (!function(item))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Filters the collection using the specified predicate.
/// </summary>
/// <param name="predicate"> The predicate. </param>
/// <returns> </returns>
/// <exception cref="ArgumentNullException">Thrown if the argument is null.</exception>
public virtual TIterable Where(Func <TElem, bool> predicate)
{
if (predicate == null)
{
throw Errors.Argument_null("predicate");
}
using (var builder = EmptyBuilder) {
ForEach(v => {
if (predicate(v))
{
builder.Add(v);
}
});
return(builder.Produce());
}
}
/// <summary>
/// Implementation for a method that incrementally applies an accumulator over the collection, and returns a sequence of partial results. Runs from last to first.
/// </summary>
/// <typeparam name="TElem2"> The type of the element in the return collection. </typeparam>
/// <typeparam name="TRSeq"> The type of the return provider. </typeparam>
/// <param name="bFactory"> A prototype instance of the resulting collection provider, used as a builder factory. </param>
/// <param name="initial"> The initial value for the accumulator. </param>
/// <param name="accumulator"> The accumulator. </param>
/// <exception cref="ArgumentNullException">Thrown if the argument null.</exception>
/// <returns> </returns>
protected virtual TRSeq _ScanBack <TElem2, TRSeq>(TRSeq bFactory, TElem2 initial, Func <TElem2, TElem, TElem2> accumulator)
where TRSeq : IBuilderFactory <ISequentialBuilder <TElem2, TRSeq> >
{
bFactory.CheckNotNull("bFactory");
if (accumulator == null)
{
throw Errors.Argument_null("accumulator");
}
using (var builder = bFactory.EmptyBuilder)
{
AggregateBack(initial, (r, v) =>
{
r = accumulator(r, v);
builder.Add(r);
return(r);
});
return(builder.Produce());
}
}
