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POC++ template partial specialization - specializing one member function only
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  1. POC++ template partial specialization - specializing one member function only
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    copied!<p>Bumped into another templates problem:</p> <p>The problem: I want to partially specialize a container-class (foo) for the case that the objects are pointers, and i want to specialize only the delete-method. Should look like this:</p> <p><strong>The lib code</strong></p> <pre><code>template &lt;typename T&gt; class foo { public: void addSome (T o) { printf ("adding that object..."); } void deleteSome (T o) { printf ("deleting that object..."); } }; template &lt;typename T&gt; class foo &lt;T *&gt; { public: void deleteSome (T* o) { printf ("deleting that PTR to an object..."); } }; </code></pre> <p><strong>The user code</strong></p> <pre><code>foo&lt;myclass&gt; myclasses; foo&lt;myclass*&gt; myptrs; myptrs.addSome (new myclass()); </code></pre> <p>This results into the compiler telling me that myptrs doesnt have a method called addSome. Why ?</p> <p>Thanx.</p> <p><hr/><h2><strong>Solution</strong></h2> based on tony's answer here the fully compilable stuff</p> <hr/> <p><strong>lib</strong></p> <pre><code>template &lt;typename T&gt; class foobase { public: void addSome (T o) { printf ("adding that object..."); } void deleteSome (T o) { printf ("deleting that object..."); } }; template &lt;typename T&gt; class foo : public foobase&lt;T&gt; { }; template &lt;typename T&gt; class foo&lt;T *&gt; : public foobase&lt;T *&gt; { public: void deleteSome (T* o) { printf ("deleting that ptr to an object..."); } }; </code></pre> <p><strong>user</strong></p> <pre><code>foo&lt;int&gt; fi; foo&lt;int*&gt; fpi; int i = 13; fi.addSome (12); fpi.addSome (&amp;i); fpi.deleteSome (12); // compiler-error: doesnt work fi.deleteSome (&amp;i); // compiler-error: doesnt work fi.deleteSome (12); // foobase::deleteSome called fpi.deleteSome (&amp;i); // foo&lt;T*&gt;::deleteSome called </code></pre>
 

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