STL list error

[Rupert Wood]

Wilson wrote:

> Check the following sample code. Here I expect the second unique()
> call to the list should make the list unique after the addition of 
> 20 again. But its not happening. Can you provide the reason for
> this.

C++ standard 23.2.2.4:

| 19. Effects: Eliminates all but the first element from every
|     consecutive group of equal elements ...

i.e. unique() only considers uniqueness vs. adjacent elements. You need
to 'myList.sort();' first.

Rup.