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    copied!<p>If I understood you corretcly, you are looking for something like this. Note, I made some simple constructor just to illustrate that it works. Also, your <code>class A</code> is mine <code>class TWrapperBase</code>, <code>B</code> - <code>TWrapperB</code>, <code>C</code> - <code>TWrapperC</code>. Another thing, you don't really need to have two derived classes for this particular example, but I assume your classes <code>B</code> and <code>C</code> are significantly different to justify it in your program.</p> <p>EDIT: Forgot to increment lIterSet in the loop.</p> <pre><code>#include &lt;vector&gt; #include &lt;set&gt; #include &lt;iostream&gt; template&lt; typename PType, typename PContainer &gt; class TWrapperBase { public: typedef PType TType; typedef PContainer TContainer; typedef typename TContainer::iterator TIterator; protected: TContainer mContainer; public: TWrapperBase( const TContainer&amp; pOriginal ) : mContainer( pOriginal ) { } TIterator begin( void ) { return mContainer.begin(); } TIterator end( void ) { return mContainer.end(); } }; template&lt; typename PType, class PContainer = std::vector&lt; PType &gt; &gt; class TWrapperB : public TWrapperBase&lt; PType, PContainer &gt; { public: TWrapperB( const TContainer&amp; pOriginal ) : TWrapperBase( pOriginal ) { } }; template&lt; typename PType, class PContainer = std::set&lt; PType &gt; &gt; class TWrapperC : public TWrapperBase&lt; PType, PContainer &gt; { public: TWrapperC( const TContainer&amp; pOriginal ) : TWrapperBase( pOriginal ) { } }; int main( void ) { int lInit[] = { 1, 2, 3 }; std::vector&lt; int &gt; lVec( lInit, lInit + 3 ); std::set&lt; int &gt; lSet( lInit, lInit + 3 ); TWrapperB&lt; int &gt; lB( lVec ); TWrapperC&lt; int &gt; lC( lSet ); std::vector&lt; int &gt;::iterator lIterVec = lB.begin(); std::set&lt; int &gt;::iterator lIterSet = lC.begin(); while( lIterVec &lt; lB.end() ) { std::cout &lt;&lt; "vector: " &lt;&lt; *lIterVec &lt;&lt; " / set: " &lt;&lt; *lIterSet &lt;&lt; std::endl; lIterVec++; lIterSet++; } return 0; } </code></pre>
 

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