public static IEnumerable <T> Repeat <T>(T element, int count)
{
if (count < 0)
{
throw EnumerableExtra.CreateOutOfRange("count");
}
return(RepeatHelper(element, count));
}
public static IEnumerable <int> Range(int start, int count)
{
long test = (start + (long)count) - 1L;
if (count < 0 || test > (long)Int32.MaxValue)
{
throw EnumerableExtra.CreateOutOfRange("count");
}
return(RangeHelper(start, count));
}
public static T First <T>(this IEnumerable <T> enumerable)
{
if (enumerable == null)
{
throw new ArgumentNullException("enumerable");
}
using (var e = enumerable.GetEnumerator())
{
if (!e.MoveNext())
{
throw EnumerableExtra.CreateEmpty();
}
return(e.Current);
}
}
private static T AggregateHelper <T>(this IEnumerable <T> source, Func <T, T, T> func)
{
using (var e = source.GetEnumerator())
{
if (!e.MoveNext())
{
throw EnumerableExtra.CreateEmpty();
}
var result = e.Current;
while (e.MoveNext())
{
result = func(result, e.Current);
}
return(result);
}
}
public static double Max(this IEnumerable <double> e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
using (var enumerator = e.GetEnumerator()) {
if (!enumerator.MoveNext())
{
throw EnumerableExtra.CreateEmpty();
}
var max = enumerator.Current;
while (enumerator.MoveNext())
{
if (enumerator.Current > max)
{
max = enumerator.Current;
}
}
return(max);
}
}
public static long Min(this IEnumerable <long> e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
using (var enumerator = e.GetEnumerator()) {
if (!enumerator.MoveNext())
{
throw EnumerableExtra.CreateEmpty();
}
var min = enumerator.Current;
while (enumerator.MoveNext())
{
if (enumerator.Current < min)
{
min = enumerator.Current;
}
}
return(min);
}
}
public static T ElementAt <T>(this IEnumerable <T> enumerable, int count)
{
if (enumerable == null)
{
throw new ArgumentNullException("enumerable");
}
using (var e = enumerable.GetEnumerator())
{
int cur = 0;
do
{
if (!e.MoveNext())
{
throw EnumerableExtra.CreateOutOfRange("count");
}
cur++;
}while (cur <= count);
return(e.Current);
}
}
public static T First <T>(this IEnumerable <T> enumerable, Func <T, bool> predicate)
{
if (enumerable == null)
{
throw new ArgumentNullException("enumerable");
}
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
foreach (var cur in enumerable)
{
if (predicate(cur))
{
return(cur);
}
}
throw EnumerableExtra.CreateNoMatch();
}