Re: vectors

On Sat, Dec 5, 2009 at 9:59 AM, ML <[email protected]> wrote:
> Hi Clark,
>
> Thanks for the reply.
>
>>> I have code that uses a standard vector.
>
>>> I get errors that say: ISO forbids declarations of vector with no type.
>
>> That's probably because CW8 did the (non-standard/pre-standard) trick
>> of putting everything in the global namespace. vector is in the std
>> namespace and as such you'll need to do one of the following:
>>
>> 1) Add "using namespace std;" to your file in order to bring in the
>> whole std namespace
>> 2) Add "using std::vector" in order to just bring in vector
>> 3) Use the fully qualified "std::vector" wherever you currently use "vector"
>>
>> Personally, #2 is the option that I usually go for (i.e. just pull in
>> the symbols that I use).
>
>
>
> OK, so I like #2 better, what if I was using vector and list?
>
> Can I do something like: "using std::vector::list"

They would each need to be separate lines:

using std::vector;
using std::list;

> Or can I just do this when I actually declare and use the vector each time:
> "using std::vector <type> vector_name"

If I understand you, you would do:

typedef std::vector<type> vector_name;

which would make "vector_name" a synonym for std::vector<type>

-- 
Clark S. Cox III
[email protected]