Re: [Boost-users] [corrected]How to delay the initialisation of a member in a C++ base class until the ctor of derived class is executed?

Subject: Re: [Boost-users] [corrected]How to delay the initialisation of a member in a C++ base class until the ctor of derived class is executed?
From: Matthieu Brucher (matthieu.brucher_at_[hidden])
Date: 2009-03-25 05:10:16

2009/3/25 tom tan <ttan_at_[hidden]>:
> Here's the scenario: I want define a base class that allocate some
> buffer once for all derived classes, while the size of the buffer varies
> among different derived classes. I could achieve it in this way:
>
> class base
> {
> public:
>     base():size(), p_array(0){}
> private:
>     size_t size;
>     boost::shared_array<unsigned char> p_array;
>
> };
>
> in the derived class:
>
> class derived
> {
> public:
>     derived(size_t array_size):size(array_size)
>     {
>          p_array.reset(new unsigned char[size]);
>     }
> };

There are still many mistakes:
- derived does not inherit from base
- size is not a member of derived and thus cannot be initialized in
its constructor

Matthieu
-- 
Information System Engineer, Ph.D.
Website: http://matthieu-brucher.developpez.com/
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