public static void ThrowIf_Null_InvalidLength <T>(int minLength, int maxLength, params IEnumerable <T>[] collections)
{
ThrowUtils.ThrowIf_Negative(minLength, maxLength);
ThrowUtils.ThrowIf_IntervalInvalid(minLength, maxLength, true);
if (collections == null)
{
return;
}
for (int i = 0; i < collections.Length; i++)
{
IEnumerable <T> c = collections[i];
if (c == null)
{
throw new ArgumentNullException($"Argument {i + 1} of {collections.Length} cannot have NULL value");
}
else
{
int count = c.Count();
if (count > maxLength || count < minLength)
{
throw new ArgumentException($"Argument {i + 1} of {collections.Length} have invalid length: {count}");
}
}
}
}
public static double?[] ToNullable(this double[] sourceArray, bool[] nullMask)
{
ThrowUtils.ThrowIf_True(nullMask.Length != sourceArray.Length, "Cannot convert to nullable array because nullMask.Length != sourceArray.Length");
double?[] nullableArray = new double?[sourceArray.Length];
for (int i = 0; i < nullableArray.Length; i++)
{
nullableArray[i] = nullMask[i] ? null : (double?)sourceArray[i];
}
return(nullableArray);
}
public static List <int> CreateListByRange(int from, int step, int count)
{
ThrowUtils.ThrowIf_Negative(count);
List <int> collection = new List <int>();
for (int i = 0; i < count; i++)
{
collection.Add(from + step * i);
}
return(collection);
}
public static List <T> CreateList <T>(T element, int count)
{
ThrowUtils.ThrowIf_Negative(count);
List <T> collection = new List <T>();
for (int i = 0; i < count; i++)
{
collection.Add(element);
}
return(collection);
}
//public static T CreateJaggedArray<T>(params int[] lengths)
//{
// var type = typeof(T);
// var elementType = getRootElementType();
// var depth = getDepth();
// var reverseLengths = lengths.Reverse().ToArray();
// Array array = Array.CreateInstance(elementType, reverseLengths[0]);
// for (int i = 1; i < depth; i++)
// {
// var length = reverseLengths[i];
// var tmpArray = Array.CreateInstance(array.GetType(), length);
// for (int k = 0; k < length; k++)
// {
// var tmp =
// Array.Copy(array, tmpArray, 1);
// length.SetValue(Array.Copy(array, tmpArray))
// }
// }
// Type getRootElementType()
// {
// var t = type;
// while (t.GetElementType().IsArray)
// {
// t = t.GetElementType();
// }
// return t.GetElementType();
// }
// int getDepth()
// {
// var i = 1;
// var t = type;
// while (t.GetElementType().IsArray)
// {
// t = t.GetElementType();
// i++;
// }
// return i;
// }
//}
#endregion
#region ##### List #####
public static List <T> CreateList <T>(int count, T initial, Func <T, T> factory)
{
ThrowUtils.ThrowIf_Negative(count);
List <T> collection = new List <T>();
var last = initial;
for (int i = 0; i < count; i++)
{
var current = factory(last);
collection.Add(current);
last = current;
}
return(collection);
}
public static List <T> Merge <T>(Func <T[], T> mergeFunc, params IList <T>[] collections)
{
if (collections.Length == 0)
{
return(new List <T>());
}
int count = collections[0].Count;
ThrowUtils.ThrowIf_True(collections.Any(c => c.Count != count));
T[] tmp = new T[collections.Length];
List <T> result = new List <T>(count);
for (int i = 0; i < count; i++)
{
for (int j = 0; j < collections.Length; j++)
{
tmp[j] = collections[j][i];
}
result.Add(mergeFunc(tmp));
}
return(result);
}