StackOverflow2013

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Id
14235904
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0
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2013-01-09T13:07:22.240
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2013-01-09T13:07:22.240
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809387
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2
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4
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text
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There are two things wrong with your code, that need to be fixed before answering the question. <ol> <li>The fact that those global pointers are global - having something global, at global namespace, is sign of bad design (if your teacher is advocating it - because it seems kinda like homework - then slap him in the face for doing so).</li> <li>The fact that those global pointers are raw pointers - you either want to keep the ownership in their place and not pass the ownership around - then you'll use either <code>unique_ptr</code> or just plain object (unless the object is supposed to live longer than <code>main()</code>, but that's a weird case).</li> </ol> So, after correcting the code, it looks like this: <pre><code>int main() { A a; A b(a); } </code></pre> If you need to access those objects from other parts of the code, without explicitly passing them around, put them in sensibly named <code>namespace</code>: <pre><code>// in header namespace a_and_b // this is *wrong* name for it, of course { extern A a; extern A b; } // in one of TUs - also possible to wrap this in namespace ... { ... } A a_and_b::a; A a_and_b::b(a_and_b::a); </code></pre> Of course, if you are just asking for syntax, the answer would be: <pre><code>A * b = new A(*a); </code></pre> so just dereference the pointer to get <code>A</code> out of <code>A *</code>. But please, don't ever do this - even in freestanding environment you can easily implement own smart pointer to wrap this in sane way.
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1. POInvoking a copy constructor in C++
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1. USGriwes
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