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POStrip boost::shared_ptr from a template parameter
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  1. POStrip boost::shared_ptr from a template parameter
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    copied!<p>I am developing a C++ template library that uses both primitive types and pointer types stored in boost::shared_ptr. I am having a problem with a helper class that is used to pack primitive types into a container class if necessary before being passed into a lower layer of the library. The following shows the basic type that just passes the pointer on, and the implementation for std::string which is one of the primitives.</p> <pre><code>template &lt;class T&gt; class RRPrimUtil { public: static rr_DataType GetTypeID() {return rr_void_t;} static boost::shared_ptr&lt;RRObject&gt; PrePack(T val) {return rr_cast&lt;RRObject&gt;(val);} static T PreUnpack(boost::shared_ptr&lt;RRObject&gt; val) {return rr_cast&lt;T&gt;(val);} }; template&lt;&gt; class RRPrimUtil&lt;std::string&gt; { public: static rr_DataType GetTypeID() {return rr_string_t;} static boost::shared_ptr&lt;RRObject&gt; PrePack(std::string val) {return rr_cast&lt;RRObject&gt;(stringToRRArray(val));} static std::string PreUnpack(boost::shared_ptr&lt;RRObject&gt; val) {return RRArrayToString(rr_cast&lt;RRArray&lt;char&gt;&gt;(val));} }; </code></pre> <p>The rr_cast&lt;>() function is an alias to dynamic_pointer_cast. The problem I am having is that for the general case, the template "T" includes the "boost::shared_ptr" prefix because this type may or may not interact with a shared_ptr. The prefix messes up the dynamic_pointer_cast, because it expects just the pointer type. Is there a clean way to work around this?</p>
 

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