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POC++ Template Parameter automatically with Class Name
 

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    <p>I have a triple hierarchy class:</p> <pre><code>template&lt;class T&gt; class Singleton; class Base; class Sub : public Base, public Singleton&lt;Sub&gt;; </code></pre> <p>I' using underlying auto pointers, that's why Singleton is a template class and Sub passes itself as a template parameter. I'm developing Singleton and Base and a public API allows anyone to add their own sub classes. I actually want a real triple hierarchy like this:</p> <pre><code>template&lt;class T&gt; class Singleton; class Base : public Singleton&lt;Base&gt;; class Sub : public Base; </code></pre> <p>So that external developers don't have to worry about templates and complexity. The problem with this is that my implementation in Singleton will now call the constructor of Base whenever I create an instance of Sub (since the template parameter is Base).</p> <p>I was wondering if this could be done by pre-processor macros:</p> <pre><code>template&lt;class T&gt; class Singleton; class Base : public Singleton&lt;__CLASS_NAME__&gt;; class Sub : public Base; </code></pre> <p>Where <code>__CLASS_NAME__</code> is the class name that will be replaced by the pre-processor. Theoretically this should be possible, since the <code>__PRETTY_FUNCTION__</code> macro actually returns the class name. The problem is that one cannot do string-manipulation to remove the function name from <code>__PRETTY_FUNCTION__</code>.</p> <p>Any ideas on how I can accomplish this so that the Sub class is not aware of inheriting from a <code>Singleton&lt;template&gt;</code> class?</p>
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    1. USgoocreations
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    1. CODo you mean not aware of inheriting a `template` or not aware of inheriting a `singleton`?
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      1. USPeter Wood
    2. CO"`template<class T> class Singleton;`" -- you're bad and you should feel bad. Print all lines of your code with the word "singleton" in it and burn them.
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    3. CO`$ grep -Rli singleton . | xargs shred`
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      1. USR. Martinho Fernandes
 

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