c# - How to create large array of integers to test LongCount? -


i want allocate large array of integers test longcount operator. longcount operator used when, quote:

you expect result greater maxvalue.

so prepare test, want allocate array of integers little larger int32.maxvalue:

int64[] arr = new int64[int32.maxvalue + 10ul];

but throws overflowexception.

what want this:

int64[] arr = new int64[int32.maxvalue + 10ul];  var res = arr.longcount();

and expect res 2147483657 (which int32.maxvalue + 10).

how can this?

you write own list implementation store several arrays , link them (or there's better 1 where..). map huge ulong int 2 int32 indexes there, implement ienumerable interface on it, , test away. 

ulong listsize = int32.maxvalue + 10ul; biglist<bool> mylist = new biglist<bool>(listsize); debug.assert(mylist.longcount() == (long)listsize); console.readkey();

example implementation.. 

public class biglist<t> : ienumerable<t> {     private list<t[]> _storage = new list<t[]>();      private const int _maxstoragearraysize = 1000;      public ulong capacity { get; private set; }      public biglist(ulong capacity)      {         _storage = new list<t[]>();          capacity = capacity;          int arraysrequired = (int)math.ceiling((double)capacity / (double)_maxstoragearraysize);         int lastarraysize = (int)(capacity % (ulong)_maxstoragearraysize);          (int = 0; < arraysrequired; i++)             _storage.add(new t[(i + 1) < arraysrequired ? _maxstoragearraysize : lastarraysize]);     }      public t this[ulong idx]     {                 {             int arrayidx = (int)(idx / (ulong)_maxstoragearraysize);             int arrayoff = (int)(idx % (ulong)_maxstoragearraysize);             return _storage[arrayidx][arrayoff];         }         set         {             int arrayidx = (int)(idx / (ulong)_maxstoragearraysize);             int arrayoff = (int)(idx % (ulong)_maxstoragearraysize);              _storage[arrayidx][arrayoff] = value;         }     }      public class biglistenumerator : ienumerator<t>     {         private biglist<t> _biglist;         private ulong _idx;          public biglistenumerator(biglist<t> biglist)         {             _biglist = biglist;         }         public t current         {             { return _biglist[_idx]; }         }          public void dispose()         {             _biglist = null;         }          object system.collections.ienumerator.current         {             { return current; }         }          public bool movenext()         {             return _idx++ < _biglist.capacity;         }          public void reset()         {             _idx = 0;         }     }      public ienumerator<t> getenumerator()     {         return new biglistenumerator(this);     }      system.collections.ienumerator system.collections.ienumerable.getenumerator()     {         return new biglistenumerator(this);     } }

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