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Re: Defining iterator type through container object type

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On 09/15/11 09:51 AM, Urs Thuermann wrote:
> Can I define an iterator for an object of a standard container class
> without using the concrete type of that container object?
>
> I tried things like
>
>      1 #include<list>
>      2 void foo(std::list<int>  ilist) {
>      3     ilist.iterator it;
>      4     for (it = ilist.begin(); it != ilist.end(); ++it) { *it; }
>      5 }
>
> and
>
>      1 #include<list>
>      2 void foo(std::list<int>  ilist) {
>      3     typeof(ilist)::iterator it;
>      4     for (it = ilist.begin(); it != ilist.end(); ++it) { *it; }
>      5 }
>
> For the first code I get
>
>      foo.cc:3:11: error: invalid use of 'std::list<int>::iterator'
>
> so at least ilist.iterator seems indeed to be understood as
> std::list<int>::iterator.  In the second case I get
>
>      foo.cc:3:29: error: expected initializer before 'it'
>
> Is there a way to define the iterator without using std::list<int>::iterator
> explicitly?

Only if your compiler supports the new auto keyword.  Otherwise use a 
typedef for the parameter type.

-- 
Ian Collins

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Defining iterator type through container object type Urs Thuermann <urs@isnogud.escape.de> - 2011-09-14 23:51 +0200
  Re: Defining iterator type through container object type Ian Collins <ian-news@hotmail.com> - 2011-09-15 10:25 +1200
    Re: Defining iterator type through container object type Juha Nieminen <nospam@thanks.invalid> - 2011-09-15 06:49 +0000
      Re: Defining iterator type through container object type Marc <marc.glisse@gmail.com> - 2011-09-15 08:03 +0000
        Re: Defining iterator type through container object type Urs Thuermann <urs@isnogud.escape.de> - 2011-11-03 14:30 +0100
          Re: Defining iterator type through container object type Marc <marc.glisse@gmail.com> - 2011-11-03 18:17 +0000
            Re: Defining iterator type through container object type Urs Thuermann <urs@isnogud.escape.de> - 2011-11-04 15:10 +0100

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