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    copied!<p>As @MSN mentioned, you need to use nested templates. In your case they take the form of:</p> <pre><code>template&lt;typename T, size_t nr, template &lt;typename, size_t&gt; class FruitType&gt; class Tree { ... }; </code></pre> <p>And they are used this way:</p> <pre><code>Tree&lt;double, 20, Apple&gt; someTree; </code></pre> <p>Real example from the code you have provided (compiles under VC++ 2010):</p> <pre><code>#include &lt;iostream&gt; #include &lt;vector&gt; template &lt;typename T, size_t numberofapples&gt; class Apples { public: Apples(std::vector&lt;T&gt; appleinfo1, std::vector&lt;T&gt; appleinfo2); protected: std::vector&lt;T&gt; apple_stats; std::vector&lt;T&gt; info1, info2; }; template &lt;typename T, size_t numberofapples&gt; Apples&lt;T, numberofapples&gt;::Apples(std::vector&lt;T&gt; appleinfo1, std::vector&lt;T&gt; appleinfo2) : apple_stats(numberofapples, 0){ for (size_t i = 0; i &lt; numberofapples; ++i) { apple_stats[i] = rand(); } info1 = appleinfo1; info2 = appleinfo2; } template &lt;typename T, size_t numberoffruitperbranch, template &lt;typename, size_t&gt; class FruitType&gt; class Tree { public: Tree(size_t numberofbranches, std::vector&lt;T&gt; commonfruitinfo1, std::vector&lt;T&gt; commonfruitinfo2); protected: std::vector&lt;FruitType&lt;T, numberoffruitperbranch&gt; &gt; branchset; }; template &lt;typename T, size_t numberoffruitperbranch, template &lt;typename, size_t&gt; class FruitType&gt; Tree&lt;T, numberoffruitperbranch, FruitType&gt;::Tree(size_t numberofbranches, std::vector&lt;T&gt; commonfruitinfo1, std::vector&lt;T&gt; commonfruitinfo2) { typename FruitType&lt;T, numberoffruitperbranch&gt; single_fruit(commonfruitinfo1, commonfruitinfo2); branchset.resize(numberofbranches, single_fruit); //in the un-abstracted version that has nothing to do with fruit, I'd then iterate over the vector and run some internal code on each one }; int main() { Tree&lt;double, 10, Apples&gt; someTree(20, std::vector&lt;double&gt;(), std::vector&lt;double&gt;()); return 0; } </code></pre>
 

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