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
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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