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POSmart references in C++
 

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    <p>Edit: Welp, I guess this was a terrible idea.</p> <p>Is it possible to make a smart reference in C++ (for a specific class, since you can't overload the . operator) with the same semantics as a normal C++ reference, but which is reseated when used in an STL container?</p> <p>For example, if I have some <code>int_ref</code> class with the normal integer operators overloaded, and construction and assignment looks like this:</p> <pre><code>class int_ref{ int * p; public: int_ref(int * ip) : p(ip) {} int_ref(const int_ref &amp; other) : p(other.p) { /* maybe some refcounting stuff here */ } int_ref &amp; operator = (const int_ref &amp; other){ if (!p) throw something_bad(); *p = *other.p; return *this; } void reseat(const int_ref &amp; other){ p = other.p; } } </code></pre> <p>Then I can't use this with <code>std::vector</code> since it won't reseat the references, and I don't want this kind of thing:</p> <pre><code>std::vector&lt;int_ref&gt; vec; int_ref five = new int(5); vec.push_back(five); vec.push_back(new int(1)); std::sort(vec.begin(), vec.end()); // the value of five is now 1 </code></pre> <p>I can use rvalue references to make it play nice with the STL,</p> <pre><code>int_ref &amp; operator=(int_ref &amp;&amp; other){ reseat(other); return *this; } </code></pre> <p>But then a function that returns an <code>int_ref</code> would use the rvalue overload, and I'd get this:</p> <pre><code>int_ref make_number(){ return new int(10); } int_ref ref = new int(5); int_ref other = ref; other = make_number(); // instead of copying, as a reference would, // other now points to something other than ref </code></pre> <p>Is there a way around this? Is this just a terrible idea in general?</p>
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    1. COWhat problem are you trying to solve?
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    2. CO... what's wrong with an `int *` or `std::shared_ptr<int>`?
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      1. USbdonlan
    3. COThis is for sugar reasons, basically. I basically want a `shared_ptr` which has the same interface as the class it's pointing to.
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