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2013-03-12T22:30:48.150
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2017-05-23T12:04:54.243
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Let's look at some parts of your code and analyze what is going on. This is your code from <code>main</code>: <pre><code>Motor motor; Electromotor electromotor; SistemPornire sistempornire(motor, electromotor); SistemDirectie sistemdirectie; SistemPornireCuPreincalzire sistempornireINC(motor, electromotor); </code></pre> Notice how you create an instance of <code>SistemPornireCuPreincalzire</code> here which you then pass into the constructor of <code>Autoturism</code>: <pre><code>Autoturism masina(sistempornireINC, electromotor, motor,sistemdirectie); </code></pre> Let's look at the constructor of <code>Autoturism</code> for a second, shall we? <pre><code>Autoturism(SistemPornire&, Electromotor&, Motor&, SistemDirectie&); </code></pre> Hmm, it takes a reference to a <code>SistemPornire</code> and we're passing a reference to <code>SistemPornireCuPreincalzire</code>. That's not necessarily an error, but it's enough to get you thinking. So let's look at what the <code>Autoturism</code> constructor does: <pre><code>Autoturism::Autoturism(SistemPornire &sp, Electromotor&e, Motor&m, SistemDirectie&sd) : sistem_pornire(sp), electromotor(e), motor(m), sistem_directie(sd) { } </code></pre> Hmm... what's the type of <code>sistem_pornire</code>? Looking at the code, we see it's declared as: <pre><code>SistemPornire sistem_pornire; </code></pre> Just seeing this is enough to explain why virtual functions aren't working. The type of <code>sistem_pornire</code> is known at compile-time and there's no virtual dispatch. Remember, virtual functions happen only when you call a virtual function through a pointer (i.e. you must use the <code>-></code> operator). But let's dig a bit deeper too... So the constructor takes a reference to a <code>SistemPornire</code> instance and uses it to initialize the instance of the <code>sistem_pornire</code> member in <code>Autoturism</code>. In other words, you copy-construct the <code>sistem_pornire</code> object with the <code>SistemPornire</code> part of the <code>SistemPornireCuPreincalzire</code> you declare in <code>main</code>. The object from <code>main</code> is never called and never used. You should read carefully about the <a href="https://stackoverflow.com/questions/274626/what-is-the-slicing-problem-in-c">slicing problem</a> and about <a href="http://www.parashift.com/c++-faq/virtual-functions.html" rel="nofollow noreferrer">virtual functions</a> dispatch in C++. Good luck!
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