Perhaps simply: class base { public: base(size_t size):size(size), p_array(new unsigned char[size]){} private: size_t size; boost::shared_ptr<unsigned char> p_array; }; And then: class derived:public base { public: derived(size_t array_size):base(array_size) { } }; Do not declare size and p_array again, they will be different than the ones in the base class... Matthieu 2009/3/25 tom tan <ttan@husky.ca>:
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_ptr<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]); } private: size_t size; boost::shared_ptr<unsigned char> p_array;
};
However, in order to simplify the design of the derived class, I really want to put this line:
p_array.reset(new unsigned char[size]);
to somewhere in the base class, thus writing it only once. Is there any C++ design pattern could achieve it? Thanks
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