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POPartially specialize template member function
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  1. POPartially specialize template member function
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    copied!<p>I have a template class which looks like the following:</p> <pre><code>template &lt;template &lt;class TypeT&gt; class PoolT=pool_base&gt; struct pool_map { public: template &lt;typename U&gt; struct pool { typedef PoolT&lt;U&gt; type }; public: template &lt;typename T, size_t S=sizeof(T)&gt; T&amp; get( size_t index ); private: pool&lt;uint8_t&gt;::type pool8_; pool&lt;uint16_t&gt;::type pool16_; pool&lt;uint32_t&gt;::type pool32_; pool&lt;uint64_t&gt;::type pool64_; }; template &lt;template &lt;class TypeT&gt; class PoolT&gt; template &lt;typename T, size_t S&gt; inline T&amp; pool_map&lt;PoolT&gt;::get( size_t index ) { // Default case } template &lt;template &lt;class TypeT&gt; class PoolT&gt; template &lt;typename T&gt; inline T&amp; pool_map&lt;PoolT&gt;::get&lt;T,8&gt;( size_t index ) { // Dispatch to pool8_ } template &lt;template &lt;class TypeT&gt; class PoolT&gt; template &lt;typename T&gt; inline T&amp; pool_map&lt;PoolT&gt;::get&lt;T,16&gt;( size_t index ) { // Dispatch to pool16_ } template &lt;template &lt;class TypeT&gt; class PoolT&gt; template &lt;typename T&gt; inline T&amp; pool_map&lt;PoolT&gt;::get&lt;T,32&gt;( size_t index ) { // Dispatch to pool32_ } </code></pre> <p>You obviously noticed that I wrote what would be possible in a wonderful and ideal world where default template parameters and partial specialization of template methods are possible (without specializing the entire class).</p> <p>I would like to ear about advices to achieve the same effect, that is, being able to have a specialized method for each size S so that I can select the proper pool to use. I tried to add a <code>get_pool&lt;size_t&gt;</code> inside the pool_map, but almost the same problem happens: i can't specialize the inner class without specializing the outer one...</p> <p>The only solution that comes to my mind, would be to use an outer <code>get_pool&lt;size_t&gt;</code> class that would take the pool_map as parameters an returns a reference to the <code>poolX_</code> member, but I would like to avoid it, since it does not seems to be "the real static way".</p> <p>Thanks for reading!</p>
 

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