Pointers to elements of a C++ class

<p>I have a <strong>C++</strong> class <em>c_image</em> which contains a vector of pointers to elements of class <em>c_pixel</em>:</p><pre><br /><code>class c_image {<br /><br /> public:<br /> vector<shared_ptr<c_pixel>> pixel;<br /> ...<br />};<br /></code><br /></pre><p>Class <em>c_pixel</em> elements contain an element <em>Z</em> of type double:</p><pre><br /><code>class c_pixel {<br /><br /> public:<br /> double Z;<br /> ...<br />};<br /></code><br /></pre><p>However, they are extended with class <em>c_pixel_pv</em>, which contains <em>pv</em>, an array of three elements of type double:</p><pre><br /><code>class c_pixel_pv : public c_pixel {<br /><br /> public:<br /> double pv[3];<br /> ...<br />};<br /></code><br /></pre><p>Class <em>c_image</em> also has a function <em>filter</em></p><pre><br /><code>vector<double> c_image::filter(???) {<br /> ...<br /> };<br /></code><br /></pre><p>which will take as input a pointer to the elements <em>Z</em> or <em>pv[0]</em> or <em>pv[1]</em> or <em>pv[2]</em>.</p><p>But I have no idea how to point to these elements. I don't even know if it is possible to point, for example, only to <em>pv[0]</em> elements. I have no clue how to begin with this problem. Can anybody help me?</p><br /><h2>Click here view more answers <a href="%20http://stackoverflow.com/questions/34525474/pointers-to-elements-of-a-c-class">http://ift.tt/1Vpgopd</a></h2>