Complexity: m, where m is the length of stuff
SList.insertFront
size_t insertFront(Stuff)(Stuff stuff) if (isInputRange!Stuff || isImplicitlyConvertible!(Stuff, T))Inserts stuff to the front of the container. stuff can be a value convertible to T or a range of objects convertible to T. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.
Returns
The number of elements inserted