Container<T> Concept
  A collection of elements that provides iterators, element count and empty predicate.
  Definition
  Line 209 of System.Base/Concept.cm
  Refinement
  
   
  
  Type Parameters
  
  Constraints
  T is Semiregular
  
  typename T.ValueType
  
  typename T.Iterator
  
  typename T.ConstIterator
  
  T.Iterator is TrivialIterator and T.ConstIterator is TrivialIterator and T.ValueType is T.Iterator.ValueType
  
  T.Iterator T.Begin()
  
  T.ConstIterator T.CBegin()
  
  T.Iterator T.End()
  
  T.ConstIterator T.CEnd()
  
  long T.Count()
  
  bool T.IsEmpty()