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    <p>You can't perform a range based loop directly over a dynamically allocated array because all you have is a pointer to the first element. There is no information concerning its size that the compiler can use to perform the loop. The idiomatic C++ solution would be to replace the dynamically allocated array by an <code>std::vector</code>:</p> <pre><code>std::vector&lt;int&gt; arr(size); for(const auto&amp; i : arr) std::cout&lt;&lt; i &lt;&lt; std::endl; </code></pre> <p>Alternatively, you could use a range type that provides a begin and end iterator based on a pointer and an offset. Have a look at some of the types in the <a href="https://www.boost.org/doc/libs/1_67_0/libs/range/doc/html/index.html" rel="nofollow noreferrer">boost.range</a> library, or at the <a href="https://github.com/isocpp/CppCoreGuidelines/blob/master/docs/gsl-intro.md" rel="nofollow noreferrer">GSL</a> span proposal (example implementation <a href="https://github.com/Microsoft/GSL" rel="nofollow noreferrer">here</a>, reference for C++20 proposed type <a href="https://en.cppreference.com/w/cpp/container/span" rel="nofollow noreferrer">here</a>).</p> <hr> <p>Note that a range based for loop does work for <code>std::array</code> objects of fixes size plain arrays:</p> <pre><code>std::array&lt;int,10&gt; arr; for(const auto&amp; i : arr) std::cout&lt;&lt; i &lt;&lt; std::endl; int arr[10] = .... ; for(const auto&amp; i : arr) std::cout&lt;&lt; i &lt;&lt; std::endl; </code></pre> <p>but in both cases the size needs to be a compile-time constant.</p>
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