Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c++ > #4666

Re: array of objects of parametrized constructor

Show all headers | View raw

* Ian Collins, on 04.05.2011 11:24:
> On 05/ 4/11 09:11 PM, Alf P. Steinbach /Usenet wrote:
>> * Ian Collins, on 04.05.2011 00:18:
>>> On 05/ 4/11 07:29 AM, Alf P. Steinbach /Usenet wrote:
>>>> * asit, on 03.05.2011 20:32:
>>>>> consider this class
>>>>>
>>>>> class A
>>>>> {
>>>>>      int a;
>>>>> public:
>>>>>      A(int x):a(x)
>>>>>      {
>>>>>          cout<<"Parametrized constructor"<<endl;
>>>>>      }
>>>>> };
>>>>>
>>>>> How can I create array of objects ??
>>>>>
>>>>> I can't add the default constructor and overload the parametrized
>>>>> constructor.
>>>>
>>>> The simplest solution is to use std::vector, from the<vector>   header.
>>>>
>>>> E.g.
>>>>
>>>>        std::vector<A>    myArray;
>>>>
>>>>        myArray.push_back( A( 1 ) );
>>>>        //...
>>>>
>>>> And that's what you should be doing anyway, as a beginner. Don't mess around
>>>> with raw arrays. For that matter, don't add assembly language stubs either. ;-)
>>>
>>> In this case, using a temporary array as a helper would be fine:
>>>
>>>     A tmp[] = { 1,2,3,4 };
>>>     std::vector<A>  a(tmp, tmp+(sizeof(tmp)/sizeof(A)) );
>>
>> I disagree.
>>
>> Even an experienced programmer like yourself gets it, well not technically wrong
>> but pretty imperfect. :-(
>>
>> If done, it would better look like this:
>>
>>       int const tmp[] = { 1,2,3,4 };
>>       std::vector<A>  a(tmp, tmp+(sizeof(tmp)/sizeof(*tmp)) );
>
> You've been secretly reading c.l.c, haven't you Alf??

Sorry, I don't get it.

If you mean c.l.c++ (not the C language group), well I'm an old-timer here. You 
should recognize me. I'm one of your humble clc++m moderators, so you can safely 
assume that I know a bit of C++ and can cough up original arguments. :-)


Cheers & hth.,

- Alf

-- 
blog at <url: http://alfps.wordpress.com>

Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

array of objects of parametrized constructor asit <lipun4u@gmail.com> - 2011-05-03 11:32 -0700
  Re: array of objects of parametrized constructor "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-05-03 21:29 +0200
    Re: array of objects of parametrized constructor Ian Collins <ian-news@hotmail.com> - 2011-05-04 10:18 +1200
      Re: array of objects of parametrized constructor "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-05-04 11:11 +0200
        Re: array of objects of parametrized constructor Ian Collins <ian-news@hotmail.com> - 2011-05-04 21:24 +1200
          Re: array of objects of parametrized constructor "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-05-04 11:42 +0200
            Re: array of objects of parametrized constructor Ian Collins <ian-news@hotmail.com> - 2011-05-04 21:34 +1200
  Re: array of objects of parametrized constructor Noah Roberts <dont@email.me> - 2011-05-03 14:27 -0700
    Re: array of objects of parametrized constructor Leigh Johnston <leigh@i42.co.uk> - 2011-05-03 23:00 +0100

csiph-web