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copied!<p>This answer is more like an addition and a slight modification to the answers above.</p> <p>In some versions of Visual Studio (and possibly other compilers) there is a bug that is really annoying and doesn't make sense. So if you declare/define your <code>swap</code> function like this:</p> <pre><code>friend void swap(A& first, A& second) { std::swap(first.size, second.size); std::swap(first.arr, second.arr); } </code></pre> <p>... the compiler will yell at you when you call the <code>swap</code> function: </p> <p><img src="https://i.stack.imgur.com/OwEKE.jpg" alt="enter image description here"></p> <p>This has something to do with a <code>friend</code> function being called and <code>this</code> object being passed as a parameter.</p> <hr> <p>A way around this is to not use <code>friend</code> keyword and redefine the <code>swap</code> function:</p> <pre><code>void swap(A& other) { std::swap(size, other.size); std::swap(arr, other.arr); } </code></pre> <p>This time, you can just call <code>swap</code> and pass in <code>other</code>, thus making the compiler happy:</p> <p><img src="https://i.stack.imgur.com/7XdNa.jpg" alt="enter image description here"></p> <hr> <p>After all, you don't <em>need</em> to use a <code>friend</code> function to swap 2 objects. It makes just as much sense to make <code>swap</code> a member function that has one <code>other</code> object as a parameter.</p> <p>You already have access to <code>this</code> object, so passing it in as a parameter is technically redundant. </p>

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