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POC++ code gets different results in g++ and vs2008
 

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  1. POC++ code gets different results in g++ and vs2008
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    <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;vector&gt; using namespace std; struct Exmpl{ Exmpl() { cout &lt;&lt; "Exmpl()" &lt;&lt; endl; } Exmpl(const Exmpl&amp;) { cout &lt;&lt; "Exmpl(const Exmpl&amp;)" &lt;&lt; endl; } Exmpl&amp; operator=(const Exmpl&amp; rhs) { cout &lt;&lt; "operator=Exmpl()" &lt;&lt; endl; return *this; } ~Exmpl() { cout &lt;&lt; "~Exmpl()" &lt;&lt; endl; } }; void func1(Exmpl obj) { } void func2(Exmpl &amp;obj) { } Exmpl func3() { Exmpl obj; return obj; } int main() { Exmpl eobj; func1(eobj); func2(eobj); eobj = func3(); Exmpl *p = new Exmpl; vector&lt;Exmpl&gt; evec(3); delete p; return 0; } </code></pre> <p>when compiled in g++(4.4.3) I got </p> <pre><code>Exmpl() Exmpl(const Exmpl&amp;) ~Exmpl() Exmpl() operator=(const Exmpl&amp;) ~Exmpl() Exmpl() Exmpl() Exmpl(const Exmpl&amp;) Exmpl(const Exmpl&amp;) Exmpl(const Exmpl&amp;) ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() </code></pre> <p>and in vs2008, the result is:</p> <pre><code>Exmpl() Exmpl(const Exmpl&amp;) ~Exmpl() Exmpl() Exmpl(const Exmpl&amp;) ~Exmpl() operator=(const Exmpl&amp;) ~Exmpl() Exmpl() Exmpl() Exmpl(const Exmpl&amp;) Exmpl(const Exmpl&amp;) Exmpl(const Exmpl&amp;) ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() ~Exmpl() </code></pre> <p>when the code goes to "eobj = func3();" in main, the 5th and 6th lines in vs2008 result can't be found in g++. I've tried to several levels of optimize, but the result is the same. what's the reason of the difference?</p>
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    1. COTry compiling with `-fno-elide-constructors` on g++.
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