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    <p>Here's an example in plain old C++. First I make a vector of the ranges for each dimension called <code>maxes</code>. if the sum of all indices are 2 then I print did something. In the example I loop z from 0 to 1, y from 0 to 2, x from 0 to 3</p> <p>You can for sure make this more neat.</p> <p>Here goes:</p> <pre><code>#include &lt;iostream&gt; #include &lt;vector&gt; using namespace std; int f(){ return 2 ; } void inner(int depth,vector&lt;int&gt; &amp; numbers,vector&lt;int&gt; &amp; maxes){ if (depth&gt;0){ for(int i=0;i&lt;maxes[depth-1];i++){ numbers[depth-1]=i; inner(depth-1, numbers,maxes) ; } }else{ // calculate sum of x,y,z: cout &lt;&lt; "values are "; for(int i=0;i&lt;numbers.size();i++){ cout &lt;&lt;numbers[i]&lt;&lt;" "; } int thesum(0); for(int i=0;i&lt;numbers.size();i++){ thesum+=numbers[i]; } if (thesum==f()){ cout &lt;&lt; "did something! "; } cout&lt;&lt;endl; } } void donest(){ vector&lt;int&gt; numbers; numbers.resize(3); vector&lt;int&gt; maxes; maxes.push_back(4); maxes.push_back(3); maxes.push_back(2); inner(numbers.size(),numbers,maxes); } int main(){ donest(); } </code></pre> <p>result:</p> <pre><code>values are 0 0 0 values are 1 0 0 values are 2 0 0 did something! values are 3 0 0 values are 0 1 0 values are 1 1 0 did something! values are 2 1 0 values are 3 1 0 values are 0 2 0 did something! values are 1 2 0 values are 2 2 0 values are 3 2 0 values are 0 0 1 values are 1 0 1 did something! values are 2 0 1 values are 3 0 1 values are 0 1 1 did something! values are 1 1 1 values are 2 1 1 values are 3 1 1 values are 0 2 1 values are 1 2 1 values are 2 2 1 values are 3 2 1 </code></pre>
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