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POTemplate Type input used as Template Type for Member Property C++
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  1. POTemplate Type input used as Template Type for Member Property C++
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    copied!<p>So I am trying to have one template class be a container (that will later operate on) a set of contained classes, also generated from a template, and stored in a vector. </p> <p>The abstracted form of what I'm trying to do would look like this:</p> <pre><code>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, typename FruitType, size_t numberoffruitperbranch&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, typename FruitType, size_t numberoffruitperbranch&gt; Tree&lt;T, FruitType, numberoffruitperbranch&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(fruitinfo1, fruitinfo2); 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 } </code></pre> <p>The goal is that I'd like to be able to do something like:</p> <pre><code>Tree&lt;double, Apples, 10&gt; MyFirstTree(5, vectorofdata, secondvectorofdata); </code></pre> <p>At the moment, however, the compiler is telling me that FruitType is not a valid template inside the constructor function. In fact, everything inside the constructor appears to be out of scope and is being flagged, but I can't figure out why. The unabstracted version also does have a number of other member variables and functions, but the problem is definitely in the constructor of the outer class container. </p> <p>Where am I going wrong/how could this be done better?</p> <p>edit: fixed some compiler errors (I think) which I noticed were different from this trivial example that I did not make in the actual application</p>
 

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