aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

update meta data

Browse source
This commit is contained in:
Ingy döt Net 2013-04-11 12:07:39 -07:00
parent f3a896c724
commit 90e15ed6ce
3307 changed files with 1674 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Task/Polymorphic-copy/00DESCRIPTION Normal file
View file

@ -0,0 +1,8 @@
An object is [[polymorphism|polymorphic]] when its specific type may vary. The types a specific value may take, is called ''class''.
It is trivial to copy an object if its type is known:
<lang c>int x;
int y = x;</lang>
Here x is not polymorphic, so y is declared of same type (''int'') as x. But if the specific type of x were unknown, then y could not be declared of any specific type.
The task: let a polymorphic object contain an instance of some specific type S derived from a type T. The type T is known. The type S is possibly unknown until [[run time]]. The objective is to create an exact copy of such polymorphic object (not to create a [[reference]], nor a pointer to). Let further the type T have a method overridden by S. This method is to be called on the copy to demonstrate that the specific type of the copy is indeed S.