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copied!<p>Here's something I came up with when playing with C++0x features a while back. The only C++0x feature used in this is <code>static_assert</code>, so you could use Boost to replace that.</p> <p>Basically, we can use a static size check function that just checks to be sure a given index is less than the size of the vector. We use a static assert to generate a compiler error if the index is out of bounds:</p> <pre><code>template <std::size_t Index> void size_check_lt() const { static_assert(Index < N, "the index is not within the range of the vector"); } </code></pre> <p>Then we can provide a <code>get()</code> method that returns a reference to the element at a given index (obviously a const overload would be useful too):</p> <pre><code>template <std::size_t Index> T& get() { size_check_lt<Index>(); return data_[Index]; } </code></pre> <p>Then we can write simple accessors like so:</p> <pre><code>T& x() { return get<0>(); } T& y() { return get<1>(); } T& z() { return get<2>(); } </code></pre> <p>If the vector has only two elements, you can use x and y but not z. If the vector has three or more elements you can use all three.</p> <p>I ended up doing the same thing for constructors--I created constructors for vectors of dimension two, three, and four and added a <code>size_check_eq</code> that allowed them to be instantiated only for vectors of dimension two, three, and four, respectively. I can try and post the complete code when I get home tonight, if anyone is interested.</p> <p>I dropped the project halfway through, so there might be some huge problem with doing it this way that I didn't run into... at least it's an option to consider.</p>

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