Re: array of objects of parametrized constructor

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From	Ian Collins <ian-news@hotmail.com>
Newsgroups	comp.lang.c++
Subject	Re: array of objects of parametrized constructor
Date	Wed, 04 May 2011 21:24:37 +1200
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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??

-- 
Ian Collins

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

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