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POC++ range/xrange equivalent in STL or boost?
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copied!<p>Is there C++ equivalent for python Xrange generator in either STL or boost?</p> <p>xrange basically generates incremented number with each call to ++ operator. the constructor is like this:</p> <pre><code>xrange(first, last, increment) </code></pre> <p>was hoping to do something like this using boost for each:</p> <pre><code>foreach(int i, xrange(N)) </code></pre> <p>I. am aware of the for loop. in my opinion they are too much boilerplate.</p> <p>Thanks</p> <h2>my reasons:</h2> <p>my main reason for wanting to do so is because i use speech to text software, and programming loop usual way is difficult, even if using code completion. It is much more efficient to have pronounceable constructs.</p> <p>many loops start with zero and increment by one, which is default for range. I find python construct more intuitive</p> <pre><code> for(int i = 0; i < N; ++i) foreach(int i, range(N)) </code></pre> <p>functions which need to take range as argument:</p> <pre><code> Function(int start, int and, int inc); function(xrange r); </code></pre> <p>I understand differences between languages, however if a particular construct in python is very useful for me and can be implemented efficiently in C++, I do not see a reason not to use it. For each construct is foreign to C++ as well however people use it.</p> <p>I put my implementation at the bottom of the page as well the example usage.</p> <p>in my domain i work with multidimensional arrays, often rank 4 tensor. so I would often end up with 4 nested loops with different ranges/increments to compute normalization, indexes, etc. those are not necessarily performance loops, and I am more concerned with correctness readability and ability to modify.</p> <p>for example</p> <pre><code>int function(int ifirst, int ilast, int jfirst, int jlast, ...); versus int function(range irange, range jrange, ...); </code></pre> <p>In the above, if different strids are needed, you have to pass more variables, modify loops, etc. eventually you end up with a mass of integers/nearly identical loops.</p> <p>foreach and range solve my problem exactly. familiarity to average C++ programmer is not high on my list of concerns - problem domain is a rather obscure, there is a lot of meta-programming, SSE intrinsic, generated code.</p>

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